SURPASS HiT 7020 Technical Description Iss 01

7/22/2019 SURPASS HiT 7020 Technical Description Iss 01

1/48

Copyright Siemens AG 2004 All Rights reservedTitle: Technical Description SURPASS hiT 7020 File: TD_SURPASS hiT 7020_issue 1_0.docIssue: Date: Ordering Nr./SNR Author:

1.0 August 06, 2004 C. Schulze, ICN CN SM EP 3 page 1/48

SURPASS hiT 7020

Technical Description

Next Generation Multi-Service Provisioning Platform

This publication provides outline information only which (unless agreed by Company in writing) may not be

used, applied or reproduced for any purpose or form part of any order or contract to be regarded as a

representation relating to the products or services concerned. The Company reserves the right to alter withoutnotice the specification, design, price or conditions of supply of any product or service.


2/48



Disclaimer:

This Technical Description is provided as a generic descriptive document only. It does not

include any legally binding statement. The product features, and details thereof, discussed in

this Technical Description may include those that prove to be temporarily or permanently

unavailable.


3/48



Contents1 Introduction 6

1.1 ENABLING TECHNOLOGIES.................................................................................................................................8 1.1.1 Generic Framing Procedure (GFP) ........................................................ .............................................. 81.1.2 Virtual Concatenation (VC).................................................................................................................101.1.3 Link Capacity Adjustment Scheme (LCAS).............................................. ............................................ 111.1.4 Ethernet Functions .................................................................................. ............................................ 11

2 SURPASS hiT 7020 Overview 12

2.1.1 Physical Structure................................................................................................................................122.1.2 System Functional Block Diagram .......................................................... ............................................ 132.1.3 Cross Connection and Switching Capability .................................................... ................................... 132.1.4 Line and Service Interfaces ............................................................................................................ .....142.1.5 System Management Interfaces ...........................................................................................................14

2.2 SDH CAPABILITIES ..........................................................................................................................................15 2.3 ADVANCED DATA SERVICE SUPPORT...............................................................................................................15

2.3.1 VLAN ...................................................................................................................................................15

2.3.2 Input Information Rating Limiting....................................... ........................................................... .....162.3.3 Class of Service ...................................................................................................................................162.3.4 GFP Data Encapsulation ....................................................................................................................162.3.5 RSTP Based Protection.................................................................. ...................................................... 172.3.6 L2 Multicast Function.................................................................... ...................................................... 172.3.7 Ethernet Data Transport Support.......... ........................................................... ................................... 17

2.4 CHASSIS DESCRIPTION .....................................................................................................................................19 2.5 MANAGEMENT INTERFACES .............................................................................................................................20 2.6 SYSTEM LEDS..................................................................................................................................................20 2.7 CROSS CONNECT CAPABILITY ..........................................................................................................................21 2.8 TIMING FUNCTION AND SSM SUPPORT ............................................................................................................21 2.9 STM-1/4 LINE INTERFACES .............................................................................................................................22 2.10 ETHERNET INTERFACES....................................................................................................................................23

2.10.1 4FE/L2 Service Interface Module.....................................................................................................232.11 E1 INTERFACES ................................................................................................................................................25 2.12 NETWORK PROTECTION ...................................................................................................................................25

2.12.1 MSP ....................................................... ........................................................... ................................... 252.12.2 SNCP ...................................................................................................................................................252.12.3 LCAS............... ........................................................... ........................................................... ...............262.12.4 Ethernet Shared Protection Ring..................... ........................................................... .........................262.12.5 Multiple Layers Protection............................................................ ...................................................... 27

2.13 EQUIPMENT REDUNDANCY AND PROTECTION..................................................................................................27 2.13.1 Protection under Abnormal Condition .................................................... ............................................ 272.13.2 Software Fault Tolerance .................................................... ........................................................... .....282.13.3 Data Security ................................................... ........................................................... .........................28

3 Technical Specification 293.1 SDH OVERHEAD ..............................................................................................................................................30 3.2 INTERFACE TYPES ............................................................................................................................................32

3.2.1 Electrical Interfaces ......................................................................................... ................................... 323.2.2 Optical Interfaces ...................................................... ........................................................... ...............333.2.3 Management and Maintenance Interface ......................................................... ................................... 33

3.3 INTERFACE PERFORMANCE SPECIFICATIONS ....................................................................................................34 3.3.1 Optical Interface Performances...........................................................................................................343.3.2 STM-1 Optical Interface Performance .................................................... ............................................ 343.3.3 STM-4 Optical Interface Performance .................................................... ............................................ 353.3.4 Electrical Interface Performances........................................................... ............................................ 36


4/48



3.3.5 Timing and Synchronization Performance ..........................................................................................393.3.6 Jitter Performance............. ............................................................ ...................................................... 39

3.4 TIMING .............................................................................................................................................................41 3.5 POWER SOURCE AND CONSUMPTION................................................................................................................42

3.5.1 Power Modules .......................................................... ........................................................... ...............42

3.5.2 Power Consumption ............................................................................................................................423.6 MECHANICAL STRUCTURE ...............................................................................................................................42 3.7 ENVIRONMENT REQUIREMENTS .......................................................................................................................43 3.8 ELECTROMAGNETIC COMPATIBILITY ...............................................................................................................43 3.9 VIBRATION TESTS ............................................................................................................................................44

3.9.1 Shipping Test ................................................... ........................................................... .........................443.9.2 Office Test............................................................................................................................................44

3.10 SYSTEM MTBF AND FIT..................................................................................................................................45

4 DEFINITIONS AND ABBREVIATIONS 46


5/48



List of Tables

Table 1 - Comparison between GFP and PPP ....................................................... ..................................................9Table 2 - System Configuration.............................................................................................................................12Table 3- Main board management interfaces ........................................................ ................................................20Table 4 - System LEDs..........................................................................................................................................20Table 5 - STM-1 line interface parameters............................................................................................................22Table 6 - STM-4 line interface parameters............................................................................................................22Table 7 - Cross-Connect Multiplexing Structure acc. ITU-T G.707 .................................................. ...................29Table 8 - Terminated Mapping Structure .................................................... ..........................................................29Table 9 - SDH overhead bytes supported by SURPASS hiT 7020 .................................................... ...................30Table 10 - SURPASS hiT 7020 Interface Types ................................................... ................................................32Table 11 - STM-1/4 Optical Interface Parameters and Application Codes .................................................. .........34Table 12 - STM-1 Optical Interface Specifications...............................................................................................34Table 13 - STM-4 Optical Interface Specifications...............................................................................................35Table 14 - 2048 kbit/s Electrical Interface Parameters acc to ITU-T G.703 .........................................................36Table 15 - 1544 kbit/s Electrical Interface Parameters (ITU-T G.703) ........................................................ .........37Table 16 - Electrical Interface Output Signals Bit Rate Allowable Deviation ......................................................38Table 17 - Electrical Interface Allowable Input Attenuation.................................................................................38Table 18 - Electrical Interface Allowable Input Port Frequency Deviation ..........................................................38Table 19 - Electrical Interface Input Port Anti-Interference Capability ....................................................... .........38Table 20 - Timing Output Jitter.............................................................................................................................39Table 21 - Internal Timing Source Output Frequency...........................................................................................39Table 22 - STM-1/4 Interface Output Jitter...........................................................................................................39Table 23 - STM-1 Interface Jitter Tolerance ......................................................... ................................................40Table 24 - STM-4 Interface Jitter Tolerance ......................................................... ................................................40Table 25 - PDH mapping jitter generation specification ......................................................... .............................40Table 26 - SURPASS hiT 7020 PDH interface combined jitter generation specification.....................................41 Table 27 - SURPASS hiT 7020Environment Requirements .................................................... .............................43Table 28 - SURPASS hiT 7020 Electromagnetic Compatibility Requirements....................................................43Table 29 - Shipping test standards.........................................................................................................................44Table 30 - Office test standards.............................................................................................................................44Table 31 - SURPASS hiT 7020 MTBF and FIT values ........................................................... .............................45

List of Figures

Figure 1 - Future Traffic Growth.............................................................................................................................6Figure 2 - GFP mapping .......................................................... ........................................................... .....................9Figure 3 - SURPASS hiT 7020 Physical View......................................................................................................12Figure 4 - Functional Block Diagram of SURPASS hiT 7020..............................................................................13Figure 5 - Three Ethernet data transmission methods in SURPASS hiT 7020 rings.............................................18Figure 6 - Chassis Configuration...........................................................................................................................19Figure 7 - 4 FE/L2 module functional block diagram ................................................... ......................................23


6/48



1 Introduction

For almost two decades, Synchronous Digital Hierarchy (SDH) has been the preferred

transport technology over optical fibers. SDH is the dominant transport protocol in virtually

all long-haul networks (voice and data) as well as in metro networks that were originallydeveloped for voice traffic. As a resilient, well-understood transport mechanism, SDH has

stood the test of time. Its reliability is unsurpassed. The ability of SDH to support 50-msec

switching to backup paths, combined with extensive performance monitoring features has

resulted in the 99.999% availability that distinguishes carrier-class transport.

Legacy SDH was designed mainly to transport circuit oriented services like voice and as such

is an inherently rigid and inefficient method for transporting data. Traditionally a single wire

speed Gigabit Ethernet service (1.25G) will be allocated to one STM-16 channel (2.5G). This

means 48 % of the of this STM-16 pipe remains as idle capacity.

Figure 1 - Future Traffic Growth

The phenomenal growth in bandwidth, connectivity and content generated by the Internet,

Intranet and broadband applications, has made native data transfer a very important criteria

for telecommunication infrastructure (see Figure 1). Ethernet has become the de facto

standard for enterprise networks. In Storage Area Networks (SAN), ESCONTM, FICONTMand Fiber Channel are by far todays most dominating technology as well.

The solution is Next Generation SDHtechnology that transforms rigid, circuit-oriented

SDH networks to a universal transport mechanism that is optimized for both voice anddata.

The technology enables carriers to keep up with growing demands for bandwidth, to

efficiently carry both streaming and bursty traffic, and adapt to constantly changing traffic

patterns. Multiple protocols and thus services are supported: from basic TDM voice, Ethernet,

as well as SAN.

1

10

10

100

1000

2000

2002 2004 2006 2008 2010

Tbit/s Phone

Internet

Intranet

Source: Siemens AG


7/48



Siemens has introduced a new range of equipment that makes the promise of Next Generation

SDH a reality: the SURPASS hiT 70 series. This platform provides the flexibility of true

packet switching and Ethernet transport, while operating with the inherent reliability of SDH.

Multiple network elements are integrated and consolidated into a single compact unit. The

efficiency of this approach, together with extensive use of highly integrated componentsallows the SURPASS hiT 70series to be offered at lower costs than current solutions.

Data + Voice = SURPASS hiT 70 series

In order to address the varying needs and requirements of carriers carrier, carrier and

enterprise, the SURPASS hiT 70 series consists of a diverse range of products, namely:

Information and Communication Networks

7/19/2004

page

5

ICN CN S M EP

Products Application

hiT 7070 ADM, multiple STM-64

hiT 7060 HC ADM, STM-64, multiple STM-16

hiT 7060 ADM, multiple STM-16

hiT 7050 CC ADM, STM-16 / multiple STM-4

hiT 7030 HC ADM, STM-4, STM-1

hiT 7050 FP ADM, multiple STM-4 / STM-1

hiT 7030 ADM, STM-4 / STM-1

hiT 7020 CPEs

SURPASS Multi-Service Optical NetworksPortfolio

SURPASS hiT 70 series Multi Service Provisioning Platforms

HWp

rotection

noHW

protection

Note: This Technical Description covers SURPASS hiT 7020, only.


8/48



1.1 Enabling Technologies

In this section, the following key enabling technologies for SURPASS hiT 70 series are

described:

1) Generic Framing Procedure (GFP)

2) Virtual Concatenation (VC, a standard way of packing lower bandwidth circuits

into SDH/SONET frames)

3) Link Capacity Adjustment Scheme (LCAS)

4) Ethernet Functions

1.1.1 Generic Framing Procedure (GFP)

GFP/G.7041 provides a framing procedure for octet-aligned, variable-length payloads forsubsequent mapping into SDH SPEs.

GFP differs from other packet mappings (e.g., Packet over SONET) because it is Layer 2

independent and maintains the Layer-2 header information, in a manner such that the

destination node may reproduce the entire stream of Layer-2 frames. This in turn, allows the

transport network to transparently connect two Layer-2 devices.

GFP standard includes two modes: transparent and frame-mapped.

Transparent Mode (GFP-T) allows block-coded LAN and SAN signals, such as

Gigabit Ethernet, Fiber Channel, Ficon, and Escon, to be transported and

switched across an optical network, while preserving the full client-signal

information

Frame-Mapped Mode (GFP-F), on the other hand, is used to adapt Protocol Data

Unit (PDU)-oriented signals client signals that are already framed or

packetized by the client protocol and may operate at the data-link layer (or

higher) of the client signal. GFP-F maps one frame or packet of the client signal,

such as IP/PPP or Ethernet MAC, into one GFP frame. GFP frames, each

associated with different clients, can be multiplexed onto a single TDM channel

before SDH/SONET transport. This packet aggregation capability provides

greater bandwidth efficiency.


9/48



VC

Overhead VC Payload

GFP Frame

Preamble SFD control0x11 DA 6-bytes SA 6-bytes T/L 2-bytes Payload CRC 4-bytesEthernet Packet

PLI 2-bytes HEC 2 byte type 2-bytes HEC 2byte GFP Ex Payload FCS 4-bytes

Core Header Payload Header

Variable 4-65535 Byte

GFPFrame

SDH Frame

Figure 2 - GFP mapping

Benefits of GFP

The key benefits of GFP are the uniform mechanism to support all L2 protocols and high

encapsulation efficiency. This provides convergence of next-generation services with existing

infrastructure investment to provide network consolidation and cost savings. GFP provides:

Uniform and deterministic mapping of packet and future services to

SDH/SONET transport protocols which is more robust frame delineation than

flag-based mechanisms such as HDLC.

Flexibility of Extension Headers. This allows topology application specificfields to be defined without affecting frame delineation functions.

payload independent frame expansion, and therefore no byte stuffing.

the ability to identify the encapsulated client protocol separately from the

Extension Header. This could be used to allow frame forwarding based on

Extension Header fields without requiring recognition of the encapsulated client

protocol.

Table 1 - Comparison between GFP and PPP

GFP Multilink PPP, PPP

Support of topologies Point to point, ring and

linear

Point to point

Frame delineation No need for specific

frame flags, using the

relationship between the

PLI and cHEC to

delineate frames. More

Specific frame flags

(opening/closing flags) are

needed.


10/48



stable.

Bit/Byte stuffing No Mandatory

Class of Service

Yes, GFP frame

contains data prioritybits which supports for

congestion control

Not supported

Extendibility Excellent Not supported

Mapping method Framed, Transparent

Mapped

Framed

Jumbo frame support No limitation on the

frame length

Not supported

1.1.2 Virtual Concatenation (VC)

In order to transport payloads exceeding the payload capacity of the standard set of

Synchronous Payload Envelops (SPEs), SPE concatenation was defined. There are two types

of concatenations defined in ITU standards: contiguous and virtual concatenation.

Contiguous concatenation has been part of SDH from its early days. It was conceived to

accommodate high-speed data applications that use protocols such as ATM. The ITU defined

contiguously concatenated containers only support certain rates including: STM-4c, STM-16c

and STM-64c.

The basic idea of virtual concatenation (VC) is to create a finer granularity of payloads than

contiguous concatenation can offer. In addition, some legacy SDH equipment may not

support contiguous concatenation transport switching, and virtually concatenated traffic is

transported as individual SPEs across the SDH network and recombined at the destination

node. Carriers can map any arbitrary bandwidth to a corresponding and appropriate number of

VC-12 or VC-3 or VC-4 channels. The benefits of VC are:

Efficiency: little bandwidth is wasted and carriers now have a more efficient scenario for

carrying data over the SDH/SONET network.

Compatibility: Virtual concatenation works across legacy networks. Only the end nodes of

the network need to be aware of the containers being virtually concatenated, as this is fully

transparent to the network. Hence, with virtual concatenation, large data channels can be

routed over older networks that do not support large contiguous channels. Reliability: Virtual

Concatenation, along with LCAS, can also allow new and efficient shared protection

mechanisms.


11/48



1.1.3 Link Capacity Adjustment Scheme (LCAS)

LCAS (ITU-T Recommendation G.7043/Y.1035, approved by the ITU-T in November 2001)

is a protocol to synchronize the re-sizing of a virtual concatenation group in use, so it can bechanged without corrupting packets in the process. LCAS provides automatic recovery of a

link after member failures.

LCAS builds on Virtual Concatenation. While the virtual concatenation is a simple labeling

of individual VC/VT members within a virtual concatenation group, LCAS is a two-way

signalling protocol that runs continuously between the two ends of the pipe and ensures that

commands from the network management system to alter the pipe capacity do not impair the

users traffic. LCAS offers several highly significant additions to SDHs capabilities:

(1) The combination of VC and LCAS creates fine-tuned and variable capacity

SDH/SONET pipes to match the needs of packet data QOS (quality of service) andcustomer SLAs (service-level agreements) and to boost carriers traffic-handling

scalability and efficiency.

(2) The combination of VC and LCAS can also provide soft protection schemes.

Using VC, traffic is distributively mapped into several SDH containers (e.g. VC-

4s) and sent by different paths. When certain VC-4s in the same VC group fail,

LCAS can delete the failed VCs from the group. The traffic can then be

dynamically adapted to the rest of the VC-4s bandwidth for transmission.

Otherwise, partial bandwidth failure will lead to the failure of all the traffic. LCAS

allows hitless adjustment of the size of a virtually concatenated group of channels.

1.1.4 Ethernet Functions

Layer 2 Ethernet functions implemented in the system typically include the following:

1. Layer 2 aggregation and switching function

2. 802.1p QoS/CoS based on Ethernet port and/or VLAN

3. Rapid Spanning Tree Protocol (RSTP) to provide Layer 2 traffic protection

4. Rate limiting function at per port or per VLAN basis, the maximum allowable rate per

port or per VLAN is user provisionable.

5. VLAN function

6. Ethernet Shared Ring (ESR)


12/48



2 SURPASS hiT 7020 Overview

SURPASS hiT 7020 is a very compact and integrated STM-1/STM-4 system positioned for

Metro Access applications. SURPASS hiT 7020 supports data (FE) and PDH (E1) traffic. The

system can be ordered in the following 4 system configurations as listed in the table below:

Table 2 - System Configuration

SystemConfiguration

LOCC (VC-4equivalent)

SDH LineInterface

E1ports

FE ports

A 6 6 2 STM-1 8 -

B 6 6 2 STM-1 8 4 FE/L2

C 18 18 2 STM-4 8 -

D 18 18 2 STM-4 8 4 FE/L2

SURPASS hiT 7020 is designed to satisfy medium or low capacity metro multi-servicesaccess requirements for service provider or private enterprise networks, providing carrier-

class reliability with 99.999% availability.

Fully compliant with ITU-T and/or IEEE standards, SURPASS hiT 7020 can inter-operate

with other standards-based transport and data communication equipment. Users can build

stand-alone OC-3/STM-1 or OC-12/STM-4 networks, or inter-work with other SONET/SDH,

multi-service transport products, or data communication products to build diverse

transport/access networks.

2.1.1 Physical Structure

SURPASS hiT 7020 equipment chassis with 2 STM-1, 8 E1 and 4 FE/L2 interfaces is

shown in Figure 3:

Figure 3 - SURPASS hiT 7020 Physical View

SURPASS hiT 7020 is a very compact unit. The physical dimension of SURPASS hiT 7020

are 1.75in/44.5mm (high) 17in/433mm (wide) 10.in/265mm (deep), which is in

compliance with industry standards. All external interfaces are front access for easy

maintenance and installation, and support various installation methods: 600mm or 19" rack-

mount, desktop, and wall-mount installations.


13/48



2.1.2 System Functional Block Diagram

SURPASS hiT 7020 system functional block diagram is depicted in Figure 4:

Figure 4 - Functional Block Diagram of SURPASS hiT 7020

2.1.3 Cross Connection and Switching Capability

SURPASS hiT 7020 supports the following cross connection and switching capabilities:

2

STM-1 line interface configuration: 6

6 VC-4 equivalent LOCC

2 STM-4 line interface configuration: 18 18 VC-4 equivalent LOCC

Fast Ethernet

InterfaceFast Ethernet

Interface

STM-4/1

InterfaceSTM-4/1

Interface

STM-4/1

InterfaceSTM-4/1

Interface

GFP

L2

Switching

HOCC/LOCC

MSOverheadProcess

RSOverheadProcess

VCMapping

NE Controller Timing control

EMS/SNM

Timing

Input

Timing

Output

E1

InterfaceE1

Interface


14/48



2.1.4 Line and Service Interfaces

The system can be ordered with 2 STM-1 or 2 STM-4 line interfaces, 8 E1 interfaces, and

4 FE with L2 function interfaces depending on your traffic requirements. There are 4 different

system configurations as mentioned before:

SURPASS hiT 7020: 2 STM-1 + 8 E1

SURPASS hiT 7020: 2 STM-1 + 8 E1 and 4 FE/L2

SURPASS hiT 7020: 2 STM-4 + 8 E1

SURPASS hiT 7020: 2 STM-4 + 8 E1 and 4 FE/L2

2.1.5 System Management Interfaces

The system management interfaces for service providers are located on the main board.

There is one RJ-45 connector that enables you to connect to a network or sub-network

management system, and a RJ-45 alarm output connector providing one audio and video

alarm control.

There is also a DB9 connector to connect to a management console.

There are four LED indicators on the main board: one power status LED, and three system-alarm LEDs (Major, Critical, and Minor).


15/48



2.2 SDH Capabilities

SURPASS hiT 7020 supports GFP ITU-T G.7041/Y.1303 encapsulation for

Ethernet data.

SURPASS hiT 7020 supports VC-12-Xv virtual connection (ITU-T G.707) efficientlymapping data traffic into SDH payload. SURPASS hiT 7020 also supports LCAS

(G.7042) at VC12-Xv level, which provides dynamic bandwidth adjustment.

SURPASS hiT 7020 provides SDH network protection functions including MultiplexSection Shared Protection Ring (STM-4 interfaces), Multiplex Section Protection 1 +

1 unidirectional (STM-4 and STM-1 interfaces), and Sub-Network Connection

Protection (SNCP) at VC-12/3/4 levels.

The Timing function is part of the main board of SURPASS hiT 7020. The Timing

function selects a recovered clock from one of the line inputs, or an E1 tributary, or astation clock from the central office (two independent connections are provided), or an

internal (on the main board) Stratum 3 reference clock as the system-timing reference.

You can provision any of the clock inputs as a primary or secondary timing source.

You can identify up to four timing references, which can be prioritized to provideprotection.

2.3 Advanced Data Service Support

2.3.1 VLAN

SURPASS hiT 7020 supports Ethernet switching function, which is incompliance with IEEE

Standard 802.1Q. At the ingress, each port can be set either to accept both VLAN-tagged and

untagged frames, or to accept only the VLAN-tagged frames depending on the application

requirements. At the egress, each port can be set to remove the VLAN tags or keep the VLAN

tags. It is also possible to assign each port a PVID (Port-based VLAN ID), which will be

inserted to the untagged frames as a VLAN ID when the frames come into the port.

In addition, each port can be put into one or more VLANs by assigning a VLAN list to it

allowing different customers or different applications to share the same port. All services

within the specific VLAN in the list can dynamically share the bandwidth of the port and still

retain security. If the port belongs to a VLAN, the frames of that VLAN will be able to pass-

through the port; otherwise, the frames will be discarded.

Optionally, each port can be set to transparent mode, meaning that no switching functions will

be performed on the frames. In this case, the pairing of one LAN (customer) port and one

WAN (internal uplink) port must be established.


16/48



2.3.2 Input Information Rating Limiting

SURPASS hiT 7020 supports Input Rate Limiting function on a port basis or a VLAN basis.

An input information rate-limiting feature allows the one to control the maximum bandwidthan end user can obtain from the network. The minimum rate is 200 Kbit/s, and the bandwidth

incremental granularity is as low as 1 Kbit/s.

2.3.3 Class of Service

SURPASS hiT 7020 supports 802.1p CoS at a port basis or a VLAN basis.

At the ingress of every port, there is a buffer to accommodate the input burst when the output

port is congested. The memory for buffering is shared among all ports on a card, and the total

capacity is up to 16 Mbytes. At the egress of every port, there are four queues, which can be

assigned with different priorities or weights. The scheduling scheme can be set either to strictpolicing or weighted transmission.

2.3.4 GFP Data Encapsulation

SURPASS hiT 7020 incorporates advanced Generic Framing Procedure (GFP)

(G.7041/Y.1303) mapping scheme to encapsulate Ethernet traffic into SDH payloads. GFP

encapsulated data is then mapped into SDH payloads using Virtual Concatenation techniques

of ITU-T standard G.707/Y.1322. This process provides the most efficient mapping of the

packets and the greatest bandwidth efficiency within the network.

GFP mapping can be viewed as a multi-service encapsulation method, which strips out

unnecessary legacy aspects of SONET and SDH to provide a thin Layer 1 capability that

supports a wide range of client-service protocols. Benefits of the GFP approach include:

Simple multi-service adaptation and compatibility with existing transport networks.

Uniform, deterministic mapping of packet, storage, and future services to global

SONET and SDH transport protocols via an interoperable International

Telecommunication Union, Telecom Standardization Sector (ITU-T)

Recommendation.

Efficient network resource utilization via GFPs low overhead characteristics, and

compatibility with virtual-concatenation processing.

Premiere Time Division Multiplexing (TDM) QOS (quality of service), latency, and

jitter performance from GFP-T transparent mode, which requires minimal buffering.

Greater bandwidth efficiency through GFP-F frame-modes support for packet-level


17/48



multiplexing, which allows aggregation of multiple client streams into a single TDM

channel.

Layer 2 independent with the support for RPR and other Layer 2 protocols.

Convergence of next-generation services with existing infrastructure investment to

provide network consolidation and cost savings.

2.3.5 RSTP Based Protection

The Rapid Spanning Tree Protocol (IEEE 802.1w) provides fast L2 traffic protection.

2.3.6 L2 Multicast Function

SURPASS hiT 7020 supports L2 multicast function including pre-provisioned static

multicast, or IGMP Snooping controlled dynamic multicast.

2.3.7 Ethernet Data Transport Support

SURPASS hiT 7020 supports three Ethernet data transport schemes shown below:

Point-to-point transparent:

o In this mechanism, dedicated bandwidth is assigned to an end-to-end traffic.

The Virtual Concatenation) technique is used in SURPASS hiT 7020 to

provide more efficient bandwidth assignment. This scheme is more suitable for

high security requirements and delay-sensitive traffic as each traffic has a

dedicated bandwidth. The drawback is the limited bandwidth efficiency. As we

know, Ethernet traffic has bursty characteristics and is delay insensitive.

Statistical multiplexing is usually employed in data network to achieve

bandwidth efficiency. Dedicated bandwidth per data flow is not efficient for

bursty traffic transmission.

L2 aggregation

In this mechanism, the Ethernet switching and aggregation is performed at NE to

allow local user traffic being aggregated into a higher rate SDH trunk. The

statistical multiplexing of multiple Ethernet traffic makes the bandwidth utilization

more efficient.

Ethernet Shared Ring (ESR)

o The ESR (Ethernet Shared Ring) is a variable length packet switched multi-


18/48



node ring.

o Data traffic shares the same ring bandwidth

o MAC and VLAN based switching

o Destination strips unicast packets

o Drop and continue for broadcast and multicast

o Source node strips broadcast packets

o Class of Service indication in header to support multiple traffic priorities on

ring

o Rapid Spanning Tree protocol (IEEE 802.1w and IEEE802.1s) to provide layer

2 protections in ring configuration.

The ESR (Ethernet Shared Ring) technology can efficiently add/drop or duplicate

the data traffic on a ring. This dramatically increases the transport efficiency when

compared with the traditional point-to-point networking technology that may lead

to back-haul traffic and inefficient multicast traffic.

(c) Ethernet Shared Ring(a) Point-to-point

(transparent)

(b) Local Aggregation

3WAN

interfaces

9WAN

Interfaces

3 LAN

interfaces

2WAN

interfaces

3 LAN

interfaces

3 LAN

interfaces

Local muxing

Figure 5 - Three Ethernet data transmission methods in SURPASS hiT 7020 rings


19/48



2.4 Chassis Description

SURPASS hiT 7020 equipment is an integrated box. SURPASS hiT 7020 can be pre-

configured into 4 system capacities. The SURPASS hiT 7020 chassis (with 2 STM-1 + 21

E1 + 4 FE/L2 interfaces) is shown below:

Figure 6 - Chassis Configuration

SURPASS hiT 7020 chassis consists of the following:

A main board to provide system control, cross connects, and timing functions. The main

board also provides SDH and E1 interfaces

A daughter card (on the main board) to provide FE interfaces

A power supply module (AC or DC)

4x FE

Power module

Management interfaces

and system LEDs

2x STM-1 or 2x STM-4

optical interfaces

8x E1


20/48



2.5 Management Interfaces

The management interfaces and LEDs on SURPASS hiT 7020 are listed below.

Table 3- Main board management interfaces

Interface Name Functional description

Console RS232 interface, DB9 connector, local configuration interface

MGMT RJ45 connector,1 10/100M Base-T management interface

ALM RJ45 alarm output interface, providing one audio and video alarm

control

2.6 System LEDs

Table 4 - System LEDs

Name Color Status Functional Description

ON Power is available to the system.PWR Green

OFF Power is off

ONOne or more critical alarms are present. Or any card is in

initializing.

Flashing

One or more critical transmission alarms are present.

When any optional service card is mismatch or faulty, MJ

alarm LED and CR alarm LED will flash at the same time.

CR Red

OFF No critical alarmsON There are one or more major alarms present in the system

FlashingWhen any optional service card is mismatch or faulty, MJ

alarm LED and CR alarm LED will flash at the same time.MJ Orange

OFF No major alarms

ONThere are one or more major alarms presented in the

system.

MN Yellow

OFF

No Minor alarms

(Warning and indeterminate alarms do not turn the LEDon.)

ON There is an optical signal detected in the port

Link 1

statusGreen

OFF

There is no optical signal detected in the port.This occurs

at the initial state when the fiber is not connected to the

port, or the transmitting (TX) or receiving (RX) fiber is

mis-connected.

Link 2 Green ON There is an optical signal detected in the port


21/48



Name Color Status Functional Description

status

OFF

There is no optical signal detected in the port.This occurs

at the initial state when the fiber is not connected to the

port, or the transmitting (TX) or receiving (RX) fiber is

mis-connected.

2.7 Cross Connect Capability

SURPASS hiT 7020 supports 2 kinds of cross connect capacities 6 6 VC-4 equivalent LOCC

in the STM-1 line interface configuration, and 18 18 VC-4 equivalent LOCC in the STM-4

line interface configuration.

The following types of cross connects are possible on both cross connect units:

Uni-directional

Bi-directional

Loop backs

Multicast

2.8 Timing Function and SSM Support

The Timing function is part of the SURPASS hiT 7020 main board. The Timing function

selects a recovered clock from one of the line inputs, or a station clock from the central office,

or an E1 tributary input, or an internal Stratum 3 (only apply to the STM-4 main board)

reference as the system-timing reference. One can provision any of the clock inputs as a

primary or secondary timing source. One can identify up to four timing references, which can

be prioritized to provide protection. A slow-reference tracking loop allows the Timing function

to synchronize to the recovered clock, which provides holdover if the reference is lost.

The STM-4 main board can run in free running, holdover, or locked mode. The normal

synchronous mode is locked mode. If all of the reference sources fail, the system switches to

holdover mode.

The STM-1 main board does not support free running/holdover/locked modes. The timing input

must be locked to an external timing reference.

A Synchronization Status Message (SSM) signal can be used to transfer the signal quality level

throughout a network. This will guarantee that all network elements will always be

synchronized to the highest quality clock available.


22/48



On the SURPASS hiT 7020 system the SDH SSM algorithm is supported on all STM-N

interfaces and on the framed 2 Mbit/s synchronization output signal (connected to the station

output clock):

1) SSM function support can be user provisioned as enabled or disabled. When the

SSM function is disabled in the NE, all STM-N interfaces and the framed 2 Mbit/s

synchronization output signal interface will send out DNU (do not use for sync) signal.

2) There are 4 possible quality levels specified in SSM for timing reference sources: PRC,

SSU-A, SSU-B, and SEC. In addition, DNU is specified in SSM. The quality of each

timing reference source can either be retrieved from the incoming SSM or provisioned

from the network management system.

3) SURPASS hiT 7020 supports the synchronization source switching algorithm based on

SSM defined in ITU-T G.781.

4) The wait-to-restore (WTR) time for timing reference source is between 0-12 minutes

and can be set from the network management system in minute increments. The default

value is 5 minutes

2.9 STM-1/4 Line Interfaces

This SURPASS hiT 7020 provides 2 STM-1 or 2 STM-4 line optical interfaces. The STM-

1/4 interfaces are fully compliant with ITU-T G.707 and G.957 standards. SURPASS hiT 7020

uses SFP for STM-1/4 optical interfaces.

Table 5 - STM-1 line interface parameters

Interface Description

2 STM-1 Optical Interface LC connector

Multiple STM-1 SFP Optical Interface modules

- STM-1 (850nm,


23/48



2.10 Ethernet Interfaces

SURPASS hiT 7020 provides 4x 10/100M Base-T interfaces with L2 function. Each Ethernet

interface option above is implemented on a daughter card and is described below as a module.

2.10.1 4 FE/L2 Service Interface Module

Function:

This interface module provides 4x 10/100M Base-T IEEE 802.3 compatible Ethernet

interfaces, and Layer 2 switching function. This module provides 4 WAN ports with total 1

VC-4 bandwidth. The functional block diagram of this module is depicted in Figure below:

Layer 2Octal

100Base-T

PHY

EOS (GFP,LAPS, VC-

12-Xv)

Total 1x VC-4

bandwidth

4x RJ-45

connectors

4x WAN

ports

Figure 7 - 4 FE/L2 module functional block diagram

The key functions provided by this module are:

GFP encapsulationITU-T G.7041/Y.1303

10/100Mbit/s Ethernet VLAN trunking

Scalable bandwidth through virtual concatenation VC-12-Xv (X=146) and LCAS

VLAN and double VLAN tagging, providing increased number of VLANs.

Access Control List (ACL) based on MAC addresses

Rapid Spanning Tree (802.1w), dramatically reducing restoration time

Layer 2 multicast functions (including static provisioned multicast and IGMP Snooping

multicasting functions), saving bandwidth on applications such as multi-media video


24/48



L2 aggregation function

Provides per port rate limiting function: the rate range of each port is from

200kbps~100Mbps (FE), and the rate provisioning granularity is 1kbps.

Provides per VLAN rate limiting function: The rate range of each VLAN is from

200kbps~100Mbps (FE), and the rate provisioning granularity is 1kbps.

Provides 802.1p QoS/CoS based on Ethernet port and/or VLAN

Each FE input interface has a buffer to support bursty data traffic transmission. The input buffer

of FE interface can accommodate up to 256 frames. Each FE interface has also 4 output queues,

each of which has a buffer that can accommodate up to 496 frames to be sent out. As each of

the input buffers and output port buffers are using independently dedicated memory spaces,

instead of sharing any common memory space, there will be no conflicts between the input

buffer and the output buffers.

For a minimum investment, this Ethernet module provides very attractive services to end

customers, like:

Scalable bandwidth without having to change interfaces

A transparent LAN service that hides the complexity of the WAN for end users (a

WAN that looks like a LAN)

High availability LAN service because of end-to-end SDH protection switching.


25/48



2.11 E1 Interfaces

SURPASS hiT 7020 provides 8 E1 interfaces. The E1 interface is 2.048MBits/s electrical

interface and is in compliance with the ITU-T G.703 standard. This SURPASS hiT 7020

supports ITU-T G.707 asynchronies mapping of E1 signal into a VC-12 container.

The 8 E1 interface version uses 8 RJ-45 connectors.

2.12 Network Protection

SURPASS hiT 7020 supports multiple layer network protection functions and multiple layer

protection escalation. The network protection functions supported are:

MS-SPRing in STM-4 rings, in compliance with ITU-T G.841

MSP 1 1 protection at STM-1, STM-4 revertive or non-revertive modes, in

compliance with ITU-T G.841

SNCP at VC-12, VC-3, VC-4 levels, in compliance with ITU-T G.841

Rapid Spanning Tree Protocol (RSTP) to provide Layer 2 Ethernet data protection by

converging data to another path, in compliance with IEEE 802.1w protocol

2.12.1 MSP

1+1 MSP (G.841/Clause 7) protects an STM-N link between two adjacent SDH MS

(multiplexing section) elements.

SURPASS hiT 7020 supports 1+1 multiplex section protection (MSP) on all STM-N optical

ports. MSP 1+1 can be either uni-direction or bi-directional. The protection time is less than

50ms.

SURPASS hiT 7020 also supports Manual switch and Forced switch of MSP.

2.12.2 SNCP

SNCP: Sub-Network Connection Protection (also known as path protection).

SURPASS hiT 7020 supports Sub-Network Connection (SNC) protection (ITU-T G.841). It is

available at the VC-12, VC-3 and VC-4 level. SURPASS hiT 7020 supports VC-4/3/12 SNC

protection between any pair of VC-4/3/12s in any STM-N Card.

The protection switch time for SNC protection is 50 ms.


26/48



The SNC protection scheme supported in SURPASS hiT 7020 is inherently monitored SNC or

SNC/I. So SNCP protected VC-4s are protected against AIS or LOP at the AU-4 level (server

layer defects) and against misconnections (trace identifier mismatch or VC-4 dTIM),

disconnections (unequipped signal or VC-4 dUNEQ), or signal degradations (VC-4 dDEG) in

the VC-4 itself. Likewise, SNCP protected VC-3s and VC-12s are protected against TU3/12-

AIS, TU3/12-LOP (server layer defects), VC-3/12 dTIM, dUNEQ, and dDEG.

An advantage of SNCP is the flexibility to select any segment of the path for protection. The

SNC protection can be applied to an end-to-end (from source to sink termination point) VC-n

path, or to one or multiple links within the end-to-end path. It is also simple and easy to

implement, as there is no signaling required between the source and destination nodes.

2.12.3 LCAS

SURPASS hiT 7020 supports the combination of VC and LCAS to provide VC-4 or VC-12

level protection. LCAS allows hitless adjustment of the size of a virtually concatenated groupof channels. For example, when VC-12-Xv bandwidth is used to transmit data traffic through

the network.

In the case that certain VC-12s in the same VC-12-Xv group fail, SURPASS hiT 7020 will use

LCAS to delete the failed VCs from the group, and the traffic is dynamically, or on the fly,adapted to the rest VC-12s bandwidth for transmission. Without LCAS, partial bandwidth

failure will result in the failure of the end-to-end traffic transmission.

When the failure is repaired, the LCAS will automatically add (recover) the deleted VC-12s to

the VC group.

2.12.4 Ethernet Shared Protection Ring

SURPASS hiT 7020 supports L2 switching and RSTP (IEEE 802.1w compliant) based L2

protection in ESR. The convergence time is less than six seconds. RSTP based protection is

different from SDH layer protection. SDH protection is considered a physical layer protection,

but the RSTP is a Layer 2 protection. When layer 2 Ethernet data fault is detected, even though

the physical connectivity is good, RSTP will convergence the data to another physical path.

SURPASS hiT 7020 provides increased network reliability by inter-operating MAC layer

protection with SDH protection using different hold off times at different layers. When anetwork failure is detected in multiple layers, the lower layer protection is performed first. The

higher-level protection will occur only if the lower layer protection doesnt succeed.

For example, in a fiber failure condition, SDH layer protection will be performed first. If the

SDH layer protection is successful, the Ethernet layer protection will not be performed.

However, if the SDH layer protection fails (the failure is declared after a pre-defined hold off

time for example. 100ms), the RSTP in the Ethernet layer will react to the failure and provide

the protection by converging the data to an alternative path. In the ESR, the alternative path is

the path on the other side of the ring. The hold off time in the Ethernet layer is user

provisionable.


27/48



2.12.5 Multiple Layers Protection

SURPASS hiT 7020 supports network protection functions in both SDH and Ethernet layer. In

order to coordinate the protection activities between layers, SURPASS hiT 7020 provides a

protection escalation mechanism. This uses different hold off times at different layers to make

sure that lower layer protection occurs first.

For example, in a fiber failure condition, SDH protection will be performed first. If SDH layer

protection is successful, no Ethernet protection occurs (because it is not needed). However, if

the SDH protection fails after a certain period of time (the hold off time for Ethernet

protection), Ethernet protection will occur. That is, the higher the layer, the longer the hold off

time will be. In this way, the system can fully take the advantage of the fast SDH protection

(


28/48



2.13.2 Software Fault Tolerance

The software design of the SURPASS hiT 7020 NE adopts the principles of the software

engineering, involving a top-down and object-oriented software design methods. Advanced

software developing management and designing technology assure the high quality and

reliability of NE software.

Software modularization and low coupling between modules

Multiple level software programs and data protection, with self-checking and self-

recovering functions

Data transmission checking and re-transmitting mechanisms are implemented in all

control signal transmission channels between modules to minimize the transmitting

errors

Adopted internal dog-circuit in CPU to avoid the impact of software deadlock or shut

down. No service affected when the software performs warm reset

Adopted common software platform approach. SURPASS hiT 7020 supports code

sharing and reuses as many as field proven codes to provide higher software reliability.

2.13.3 Data Security

SURPASS hiT 7020 adopts database module technology and manages data uniformly, which

enhances the data security:

Database and database files each have a data checking function

Database files are protected according to importance level of data. Errors of lower

level database files will not affect higher level database files

There are two copies in the NE FLASH, two copies protect each other


29/48



3 Technical Specification

SURPASS hiT 7020 supports the following multiplexing structure and terminated mapping and

payload mapping structures.

Table 7 - Cross-Connect Multiplexing Structure acc. ITU-T G.707

Bit Rate Cross-connect multiplexing structure

STM-4AUG-4AUG-1AU-4

STM-4AUG-4AUG-1AU-4VC-4TUG-3TU-3622.08Mb/s

STM-4AUG-4AUG-1AU-4VC-4TUG-3 TUG-2TU-

12

STM-1AUG-1AU-4

STM-1AUG-1AU-4VC-4TUG-3TU-3155.54Mb/s

STM-1AUG-1AU-4VC-4TUG-3TUG-2TU-12

Table 8 - Terminated Mapping Structure

Bit Rate Terminated Mapping Structure Container

E3 (34Mbit/s, E31) E31 C-3 VC-3 C-3

DS3 (45Mbit/s, E32) E32 C-3 VC-3 C-3

E1 (2.048Mbit/s) E1 C-12 VC-12 TU-12 TUG-2 C-12

T1 (1.544Mbit/s) T1 C-11 VC-11 TU-12 TUG-2 C-12

10/100 Mb/s (FE)10/100Mbit/s (FE) GFP C-12-Xv VC-12- Xv

(X=1..46)

C-12


30/48



3.1 SDH Overhead

The SURPASS hiT 7020 supports the following SDH overhead process as shown in table

below:

Table 9 - SDH overhead bytes supported by SURPASS hiT 7020

Overhead Name DescriptionSURPASS hiT

7020 Support

A1 and A2 Framing Bytes

J0 Regenerator Section Trace

B1 Regenerator Section BIP-8

E1 Regenerator Section Order wire

F1 Regenerator Section UserChannel

RS-OH

D1~D3 Section DCC

B2 BIP-Nx24

K1, K2

(b1~b5)APS

K2

(b6~b8)MS-RDI

D4~D12 Multiplex Section DCC

S1 Synchronous Status

M0M1 MS-REI

MS-

OH

E2 Line Orderwire

J1 Path Trace

B3 Path BIP-8

C2 Path Signal Label

G1 Path Status

F2 Path User Channel

H4 Position and Sequence Indicator

F3 Path User Channel

K3 (b1~b4) APS

VC-4-

Xc/VC-

4/VC-3

POH

K3 (b5~b6) Spare


31/48



Overhead Name DescriptionSURPASS hiT

7020 Support

K3 (b7~b8) Data link

N1 Network Operator ByteV5 (b1~b2) BIP-2

V5 (b3) LP-REI

V5 (b4) LP-RFI

V5 (b5~b7) Signal Label

V5b8 LP-RDI

J2 Path Trace

N2 Network Operator Byte

K4(b1~b4) APS

K4(b5~b7) Reserved

VC-

2/VC-1

POH

K4(b8) Data Link


32/48



3.2 Interface Types

SURPASS hiT 7020 supports the following interfaces listed in Table 10 - SURPASS hiT 7020

Interface Types below:

Table 10 - SURPASS hiT 7020 Interface Types

Interface Types Interface Name and Rates

Electrical Interface

10/100M Base-T

DS3/E3

E1 (2048kbit/s)

T1 (1544kbit/s)

Optical InterfaceSTM-1 (155.520Mbit/s)

STM-4 (622.080Mbit/s)

Timing Interface2048kbit/s

2048kHz

Auxiliary(Management and MaintenanceInterface)

RS-232, RJ-45 (802.3 LAN)

3.2.1 Electrical Interfaces

SURPASS hiT 7020 Ethernet 10/100M Base-T rate-adaptive electrical interface complies with

IEEE Standard 802.3. The transmission media is 100 Ohmstwo pairs shielded twisted pair

cable (STP) and two pairs of unshielded twisted pair cable (Category 5 UTP); the interface

connector is using standard RJ-45 (1000ohm) connector.

SURPASS hiT 7020 E1 interface complies with ITU-T G.703 Recommendation and uses

DB100 (75ohm or 120ohm) connector.


33/48



3.2.2 Optical Interfaces

The SURPASS hiT 7020 optical interfaces comply with ITU-T Recommendations G.957 and

G.691. The SFP optical modules are field replaceable.

Optical Interfaces:

STM-4 SFP interface S-4.1, L-4.2 and L-4.3

STM-1 SFP interface S-1.1, 850 nm

Laser safety for the STM-4 and STM-1 optical interface: complies with IEC-60825

recommendations.

3.2.3 Management and Maintenance Interface

SURPASS hiT 7020 provides a RS-232 connector, which supports terminal-based command

line interface.

SURPASS hiT 7020 also provides a RJ-45 100 Ohms IEEE 802.3 LAN connector, which

supports Internet browser based EMS and telnet-based command line interfaces.


34/48



3.3 Interface Performance Specifications

The SURPASS hiT 7020 performance specifications for the optical and electrical interfaces,

timing and synchronization, and jitter, as well as tests for electromagnetic compatibility,

environment, and vibration comply with the ITU-T Recommendations G.957, G.703, and IEEE

Standard 802.3.

3.3.1 Optical Interface Performances

The following table (Table 11) provides SURPASS hiT 7020 supported optical interfaces and

application codes.

Table 11 - STM-1/4 Optical Interface Parameters and Application Codes

Application Intra-officeInter-office

Short-haul

Inter-office

Long-haul

Operatingwavelength range

(nm)

850 1310 1310 1550

Type of fiberITU-T Rec.

G.651

ITU-T Rec.

G.652ITU-T Rec. G.652

ITU-T Rec. G.652

(G.653)

Distance (km)* 1 15 40 80

STM-1 I-1 S-1.1 L-1.1 L-1.2

STM-4 S-4.1 L-4.1L-4.2

(L-4.3)

* (1) Target distance is used for classification, not for standardization.(2) The actual transmission distance can be calculated base on the transmitter power,

receiver sensitivity and fiber loss.

The following tables show the STM-1, and STM-4 optical interface parameters specified for

the transmitter at point S, the receiver at point R, and the optical path between points S and R:

3.3.2 STM-1 Optical Interface Performance

Table 12 - STM-1 Optical Interface Specifications

Item Unit Value

Nominal bit rate Mbit/s 155 155 155

Application code S-1.1 L-1.1 L-1.2

Operating wavelength range nm 1261-1360 1263-1360 1480-1580

Source Type FP SLM SLM

Maximum RMS width () nm 7.7 - -Transmitter at

reference Maximum-20dBwidth nm 1 1 1


35/48



Item Unit Value

Minimum side mode

suppression ratio

dB 30 30 30

Mean launch power (Max.) dBm -8 0 0

Mean launch power (Min.) dBm -15 -5 -5

point S

Minimum extinction ratio dB 8.2 10 10

Attenuation range dB 0-12 10-28 10-28

Maximum dispersion Ps/nm 96 N/A N/A

Minimum optical return loss of

cable plant at S, including any

connectors

dB NA 20Optical path

between Sand R

Maximum discrete reflectance

between S and R

dB NA -25

Minimum sensitivity

(BER10-12)

dBm -28 -34 -34

Minimum overload dBm -8 -10 -10

Maximum optical path penalty dB 1 1 1

Receiver atreference

point RMax. reflectance of receiver,

measured at R

dB NA N/A -25

3.3.3 STM-4 Optical Interface Performance

Table 13 - STM-4 Optical Interface Specifications

Item Unit Value

Operating bit rate Mbit/s 622 622 622 622Application code S-4.1 L-4.1 L-4.2 L-4.3

Operating wavelength range nm 1274-

1356

1280-

1335

1480-

1580

1480-

1580

Source type FP SLM SLM SLM

Maximum RMS width (

)

nm 2.5 - NA NA

Maximum -20dBwidth nm NA 1 1 1

Minimum side mode

suppression ratio

dB 30 30 30 30

Mean launch power(Max.)

dBm -8 +2 +2 +2

Mean launch power

(Min.)

dBm -15 -3 -3 -3

Transmitter at

reference point S

Minimum extinction ratio dB 8.2 10 10 10

Attenuation range dB 0-12 10-24 10-24 10-24

Maximum dispersion Ps/nm NA 2400 N/A

Optical path

between S and R

Minimum optical return

loss of cable plant at S,

including any connectors

dB NA 20 24 20


36/48



Item Unit Value

Maximum discrete

reflectance between S and

R

dB NA -25 -27 -25

Minimum sensitivity(BER10-12) dBm -28 -28 -28 -28

Minimum overload dBm -8 -8 -8 -8

Maximum optical path

penalty

dB 1 1 1 1Receiver at

reference point

RMax. reflectance of

receiver, measured at R

dB -27 -27 -27 -14

3.3.4 Electrical Interface Performances

This section provides the E1 electrical interface specifications:1) 2,048 Kbit/s digital interface

2) Allowable bit rate deviation of 2,048 Kbit/s and 10/100 Base-T Output Signals

3) Allowable attenuation at the 2,048 Kbit/s input port

4) Allowable frequency deviation at the 2,048 Kbit/s and 10/100 Base-T

5) Anti-interference capability of the 2,048 Kbit/s input port

3.3.4.1 Electrical Interface Parameters Specification

The following table shows the parameters for the 2048 Kbit/s digital interface:

Table 14 - 2048 kbit/s Electrical Interface Parameters acc to ITU-T G.703

Pulse Shape

(Nominally Rectangular)

All marks of a valid signal must conform

to the mask irrespective of the sign. The

value V corresponds to the nominal peak

value.

Pair(s) in each direction One coaxial pair

Test load impedance 75 Ohms resistive

Nominal peak voltage of a mark (pulse) 2.37 V

Peak voltage of a space (no pulse) 0 0.237 VNominal pulse width 244 ns

Ratio of the amplitudes of positive and negative

pulses at the center of the pulse interval0.95 to 1.05

Ratio of the widths of positive and negative pulses

at the nominal half amplitude0.95 to 1.05

Maximum peak-to-peak

itter at an output portRate

Interface Threshold

Measurement Filter

Bandwidth


37/48



Pulse Shape

(Nominally Rectangular)

All marks of a valid signal must conform

to the mask irrespective of the sign. The

value V corresponds to the nominal peak

value.

20 Hz 100 kHz

18 kHz 100 kHz

2048 kbit/s 1.5 UI 0.2 UI

Table 15 - 1544 kbit/s Electrical Interface Parameters (ITU-T G.703)

Parameter Specification

Nominal line rate 1544 kbit/s

Line rate accuracy In a self-timed, free running mode, the line rate accuracy shall be

50 bits/s (32 ppm) or better.

Line code Either (1) AMI with no more than 15 consecutive zeros, and at leastN ones in each and every time window of 8(N + 1) digit time slots

(where N can range from 1 to 23), or (2) B8ZS.

Frame structure No frame structure is required for 1544 kbit/s transmission or

higher level multiplexing to higher level DSN signals.

Medium One balanced twisted pair shall be used for each direction of

transmission.

Test load impedance 100 ohms 5%

Pulse amplitude Between 2.4 V and 3.6 V

Pulse shape Figure 10 in G.703

Power level For an all-one signal, the power in a 3 kHz 1 kHz band is centred

at 772 kHz shall be between 12.6 dBm and 17.9 dBm. The power in

a 3 kHz 1 kHz band is centred at 1544 kHz shall be at least 29 dB

below that at 772 kHz.

Pulse imbalance In any window of seventeen consecutive bits, the maximum

variation in pulse amplitudes shall be less than 200 mV, and the

maximum variation in pulse widths (half amplitude) shall be less

than 20 ns.

DC power No DC power applied at the interface.

Verification access Access to the signal at the interface shall be provided for

verification of these signal specifications.


38/48



3.3.4.2 Allowable Bit Rate Deviation of Output Signals

Allowable Bit Rate Deviation of Output Signals is the difference between the actual signal bitrate and the nominal bit rate measured under AIS output condition. SURPASS hiT 7020 meets

the standard requirements of output signal allowable bit rate deviation as shown below.

Table 16 - Electrical Interface Output Signals Bit Rate Allowable Deviation

Electrical Interface Types Standard Requirements (ppm)

2048 kbit/s 50

1544 kbit/s 32

10/100 Base-T 100

3.3.4.3 Allowable Attenuation at the Input Port

SURPASS hiT 7020 meets the standard requirements for the allowable attenuation at the inputport (see Table 17 below):

Table 17 - Electrical Interface Allowable Input Attenuation

Electrical Interface Types Standard Requirements (dB)

2048 kbit/s 0 ~ 6

3.3.4.4 Allowable Frequency Deviation at the Input Port

Allowable input signals frequency deviation is the signal bit rate variation range that the systemcan tolerate. The following table shows the standard requirements for the allowable frequency

deviation at the input port:

Table 18 - Electrical Interface Allowable Input Port Frequency Deviation

Electrical Interface Types Standard Requirements (ppm)

2048 kbit/s 50

1544 kbit/s 32

10/100 Base-T 100

3.3.4.5 Anti-interference Capability of the Input Port

SURPASS hiT 7020 meets the standard requirements for the anti-interference capability of theinput port (see Table 19 below):

Table 19 - Electrical Interface Input Port Anti-Interference Capability

Electrical Interface Types Standard Requirements (dB)

2048 kbit/s 18


39/48



3.3.5 Timing and Synchronization Performance

3.3.5.1 Output Jitter

The following table shows the maximum acceptable level of network output jitter for the

timing (synchronization) interface:

Table 20 - Timing Output Jitter

Output InterfaceMeasuring band

(-3dB frequencies)

Peak-to-peak Amplitude (UIpp)

PRC 20 ~ 100 K 0.05 UI

SSU 20 ~ 100 K 0.05 UI

20 ~ 100 K 0.5 UISEC

49 ~ 100 K 0.2 UI

20 ~ 100 K 1.5 UISECPDH Synchronization(2048 kbit/s)

18 ~ 100 K 0.2 UI

3.3.5.2 Internal Timing Source Output FrequencyThe following table shows the output accuracy of the timing interface in its free-run mode:

Table 21 - Internal Timing Source Output Frequency

Timing Interface Standard requirement (ppm)

System Clock 4.6

3.3.6 Jitter Performance

Jitter and wander tolerance, transfer, and production specifications comply with the ITU- T

Recommendations G.783, G.813 Option 1, G.823, G.824, G.825, and G.958; the China MII

standard YD/T 1146-2001 and ETSI standards.

3.3.6.1 STM-1/4 Interface Output Jitter

The following table shows the maximum acceptable level of output jitter at any STM-N output

within a digital network (measured of a 60 second interval):

Table 22 - STM-1/4 Interface Output Jitter

InterfaceMeasuring band

(-3dB frequencies)Peak-to-peak Amplitude (UIpp)

500 Hz ~ 1.3 MHz 1.50 UISTM-1 (Optical)

65 Hz ~ 1.3 MHz 0.15 UI

500 Hz ~ 1.3 MHz 1.50 UISTM-1 (Electrical)

65 Hz ~ 1.3 MHz 0.075 UI

STM-4 (Optical) 1000 Hz ~ 5 MHz 1.50 UI


40/48



InterfaceMeasuring band

(-3dB frequencies)Peak-to-peak Amplitude (UIpp)

250 Hz ~ 5 MHz 0.15 UI

3.3.6.2 STM-1, STM-4, and PDH Input Interface Jitter Tolerance

The following tables show the input jitter tolerance for the STM-N interfaces:

Table 23 - STM-1 Interface Jitter Tolerance

Interface Frequency (Hz) Peak-to-Peak Jitter Amplitude

10 < f


41/48



Maximum Peak-Peak

JitterFilter Characteristics

Mapping

G.703

(PDH)

Interface f1

High pass

f3

High pass

f4

Low pass

f1-f4 f3-f4

2 048 kbit/s20 Hz20 dB/dec

18 kHz

(700 Hz)

20

dB/dec

100 kHz60

dB/dec

0.075 UI

Table 26 - SURPASS hiT 7020 PDH interface combined jitter generation specification

Maximum Peak-Peak

JitterFilter CharacteristicsCombinedG.703

(PDH) Interface f1

high pass

f3

high

pass

f4

low pass

f1-f4 f3-f4

1 544 kbit/s

10 Hz

20 dB/dec

8 kHz 40 kHz

20

dB/dec

2 048 kbit/s

20 Hz

20 dB/dec

18 kHz

(700 Hz)

20dB/dec

100 kHz

60

dB/dec

0.4 UI 0.075 UI

3.4 Timing

SURPASS hiT 7020 provides the following timing clock interfaces:

External clock source1 input port, 2048kbit/sG.703-6or 2048kHzG.703-10) 75

Synchronize output1 output port, 2048kbit/sG.70375

SURPASS hiT 7020 supports the selection of the following 3 timing references:

Line/tributary timing (STM-1/4 lines or tributaries, or E1 tributary)

External station clock timing

Internal clock (ITU-T G.813 option 1), applicable to STM-4 main board only


42/48



3.5 Power Source and Consumption

3.5.1 Power Modules

SURPASS hiT 7020 supports -48V-40.5~-57.0 V) DC power supply or 100-240V AC power

supply, support load balanced 1+1 power supply modular protection.

3.5.2 Power Consumption

Total power consumption:

STM-1 system configuration: 10W 30W (Typical)

STM-4 system configuration: 10W 55W (Typical)

3.6 Mechanical Structure

SURPASS hiT 7020 chassis mechanical parameters:

Height: 44.5mm (1.75 inch, 1RU)

Width 433mm (17 inch)

Depth 265mm (10.4 inch)

WeightMaximum 7.6 kg

SURPASS hiT 7020 can be installed in the following racks:

EIA 310 19

2200mm(Height) 600mm (Width) 600mm (Depth)

2600mm (Height) 600mm (Weight) 600mm (Depth)

Desktop

Wall Mounting


43/48



3.7 Environment Requirements

SURPASS hiT 7020 system is designed to comply with the following ETSI requirements (ETS

300 019) on environmental conditions:

ETSI Class 3.1 on Environment, including the exceptional climatic limits (class3.1E).

ETSI Class 1.2 on Storage

ETSI Class 2.3 on Transportation

The environmental conditions required by SURPASS hiT 7020 are as follows:

Table 27 - SURPASS hiT 7020Environment Requirements

Environmental Condition Temperature Relative Humidity

Transport and storage -20 ~ 60 2% ~ 98%

Operation for long term -5 ~ 45 10% ~ 90% (35)

Operation for short term -10 ~ 50 10% ~ 90% (35)

3.8 Electromagnetic Compatibility

SURPASS hiT 7020 is designed to comply with the current and oncoming mandatory

requirements of ETS300386 and ETS300127 specificationsETS300386 specification is

based on EN55022/CISPR22 (emission) and EN61000-4-x (immunity):

Table 28 - SURPASS hiT 7020 Electromagnetic Compatibility Requirements

Item Standard Reference

Radiated Emission EN 55022 Class A

Conducted Emission

- DC-power

- Telecom. Ports

ETS 300 386-1 (corresponds with EN 55022

class A for 0.15 to 30 MHz)

CISPR 22 (1997), Class A

Electrostatic Discharge EN 61000-4-2, Level 4

Radiated Immunity EN 61000-4-3, Level 2

Electrical Fast Transients


44/48



Item Standard Reference

- DC Ports

- Telecom. Ports

EN 61000-4-4, Level 1

EN 61000-4-4, Level 2

Surges

Indoor Telecom. Ports EN 61000-4-5, Level 1

Continuous Wave

All ports

(Telecom ports, DC)

EN 61000-4-6, Level 2

3.9 Vibration Tests

3.9.1 Shipping Test

SURPASS hiT 7020 meets the following shipping test standards.

Table 29 - Shipping test standards

Test Test Standard

Amplitude (>= 0.6 mm) ETSI

Acceleration (>= 15 m/sX, Y, Z three directions) ETSI

Test time (>=3 hours) ETSI

3.9.2 Office Test

SURPASS hiT 7020 meets the following office test standards

Table 30 - Office test standards

Test Test Standard

Amplitude (>= 0.6 mm) ETSI

Acceleration (>= 15 m/sX, Y, Z three directions) ETSI

Test time (>= 3 hours) ETSI


45/48



3.10 System MTBF and FIT

SURPASS hiT 7020 is a highly reliable system. The systems MTBF-Mean Time Between

Failure exceeds 80,000 hours. The detailed data is provided in the table below (Table 31).

Table 31 - SURPASS hiT 7020 M

SURPASS HiT 7020 Technical Description Iss 01

Documents

Transcript of SURPASS HiT 7020 Technical Description Iss 01