LynxPN Bypass Apllication Paper

7/31/2019 LynxPN Bypass Apllication Paper

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LightLEADER Series Products Overview:

All Optical Bypass Switching

Combined Protection/Bypass Switching

June 2011


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Content Optical Bypass Switching - Definition

Through traffic continuation during electrical power outage

Through traffic continuation during in-line equipment failure

Optical Link Protection- Definition Combined Bypass & Fiber Link Protection

LynxPN Solutions:

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LightLEADER 3002/4: Un-managed bypass (for electrical power outage) LightLEADER APS-4325: Managed bypass (for electrical power outage

and/or failed in-line equipment). Supports LAG bypass.

LightLEADER APS-4325-B: Managed Optical Protection & BypassSwitching system. Bypass is for electrical power outage. Ultra low

bypass loss.

LightLEADER 4301-i:Managed Optical Protection & Bypass Switching

system. Bypass is for electrical power outage. Low cost.

Network Engineering Considerations


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All Optical Bypass SwitchingDefinition

Bypass switching is the automatic provision of a passive fiberconnection between ports for traffic which otherwise would be carried

through active optical equipment connected to these ports (e.g.transmission add/drop multiplexer), upon a failure condition thatcauses disruption of that through traffic.

Aimed at increasing network availability by maintaining network

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continuity upon certain failure conditions in the optical network. The common failures that require bypass for the business

continuation are:

Electrical power outage in the node holding the active equipment

Failure of the active optical equipment itself


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Power Outages in Ring Nodes 1/2

Site 1

ADM

A self-healing ring can recover from a single node failure. Once automaticrecovery occurred, the ring is no longer protected and additional node or fiberfailures will cause segmentation or collapse of the network.

In some areas, electrical power outages may be widespread and may affectmore than one site for long periods of time, resulting in multiple concurrent

failures.

4

ADM

Site 3

ADM

Site 4

ADM

Site 5

ADM

Site 6

ADM

Service 1 NoPWR

Service 1 was normally

passing via site 2. Upon

power outage at site 2

service 1 is passing via

sites 4, 5 & 6. Ring is not

self healing anymore.

Service 1


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Recovery From Power Outages in Ring Nodes 2////2222

Using Optical bypass a self-healing ring can maintain service among the non-failed nodes during multiple node failures

A bypass systems located at each ring node, allows for locally bypassing a failednode, preserving overall ring connectivity & retaining the inherent ring protectionmechanisms for other network failures, such as fiber breaks.

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Business Continuation During Power Outage in Linear NetworksBusiness Continuation During Power Outage in Linear NetworksBusiness Continuation During Power Outage in Linear NetworksBusiness Continuation During Power Outage in Linear Networks

Electrical power failure in one of the linear Add/Drop network sites may cause the networkto be partitioned into two disconnected segments i.e. all nodes downstream from thefailure location (4 & 5) are completely disconnected.

LightLEADER system automatically bypasses the failed node upon power outage keepingthe other chain nodes interconnected. Can also handle more than a single node failure

Upon electrical power restoration at site 3 and the ADM completing its boot sequence, thebypass system reverts to its original state and the ADM is reconnected to the rest of thenetwork.

Most cost effective, simple and reliable solution to the vulnerability of chains to nodefailures due to electrical power outage.

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* Only one trafficdirection shown


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Maintaining Network Connectivity During Electrical Power OutageMaintaining Network Connectivity During Electrical Power OutageMaintaining Network Connectivity During Electrical Power OutageMaintaining Network Connectivity During Electrical Power Outage

and/orand/orand/orand/or InInInIn----Line Equipment FailureLine Equipment FailureLine Equipment FailureLine Equipment Failure In some cases operator seek to bypass node/in-line equipment in the event of electrical

power outage and/or failure of the in-line equipment.

Fig.-1 depicts such an example: Link to a router goes via Intrusion Prevention System(IPS) which must be in-line so to prevent bad packets from arriving at the switch/router.Fig-2 depicts a 2nd example: The in-line equipment connected over LAG (multiple physicalEthernet links that constitute one logical higher rate link)

I both cases the IPS is not critical for the service continuation, however, upon its failure, itwill cause critical interruption of the service. Bypassing the IPS will avoid the serviceinterruption due to the IPS failure.

Li htLEADER s stem b ass is tri ered b electrical ower outa e or/and failure of the

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* Only one traffic

direction shown

LightLEADER

BP-1

LAG10GE

10GE

10GE

LAG10GE

10GE

10GE

BP-2 BP-N

IPS

LAGLAG

10GE

10GE

10GE

CTRL

Status per BP

Bypass cmd

Fig. 2

IPS, commonly manifested via its ports.


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Optical Link ProtectionDefinition

Aimed at achieving service high availability by protecting theservice against equipment or network resource failures. Inoptical protection the switchover is done in the physical layer.

Provide a redundant resource for the resource which mightfail (Dedicated Protection) or for a set of similar resourceswhich might fail, one at a time (Shared Protection)

Monitor all resources health and u on failure detection do:

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I. If the failed resource is currently used by the service switch theservice to the redundant resource

II. Notify operator of the failure and actions taken via alarm mechanism

There are many protection methods, each is optimal for a setof applications. (e.g., 1+1, 1:1, 1:n, m:n; single-ended, dual-ended; unidirectional, bi-directional; equipment, link;protection, bypass; etc.)


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Combined Bypass & Fiber Link Protection 1/2

When the bypassed inline/Add/Drop equipment is connected tothe network via protected fiber links, the network will be protectedin the optical link layer as well as being bypassed.

Next slide depicts an implementation example of 3-node network(A, B & C) in which the intermediate node (B) is connected to bothedge nodes (A & C) via protected links and is also responsible topass through traffic from A to C.

Normally site A client equipment connects to interface Ma at siteB client equipment while its Mc interface connected to site C

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client equipment. Some of the traffic going from A to B arrives at the site B client

equipment but continues through it to site C (Through Traffic)

As sites A & C connected to site B via protected links, traffic willnormally go over the W (Working) links and upon a failure in a

Working link, the 1:1 optical protection switches at both links endswill switch traffic to the P (Protection) link.

Upon electrical power outage at site B the Bypass switch at thatsite connects between sites A & C, thus bypassing site B and

recovers the traffic that needs to flow between sites A & C


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Combined Bypass & Fiber Link Protection 2/2

Implementation Example

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LynxPN SolutionsLynxPN SolutionsLynxPN SolutionsLynxPN Solutions

LightLEADERLightLEADERLightLEADERLightLEADER3002300230023002////4444----UUUU An autonomous bypass system allowing for locally bypassing a failed node

upon electrical power outage.

The system need no remote management

To avoid network wide interruption while reverting, LightLEADER 3002/4-Uis equipped with programmable (from front-panel) power-up delayensuring that the bypassed equipment completes its power-up sequenceand is read to resume normal o eration before switchin back to normal.

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Supports dry contact alarm relay Amplified bypass option - LL3002/4 can be also offered together with

bidirectional amplifiers and UPS to ensure that during bypass the signal isamplified to reach the next network node.

Download the product full datasheet at: http://www.lynxpn.com/data/uploads/Brochures/Brochure_LL3002-U.pdf


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LightLEADERLightLEADERLightLEADERLightLEADER3002300230023002////4444----UUUU

Optical ConnectivityOptical ConnectivityOptical ConnectivityOptical Connectivity

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Amplified Bypass Block DiagramAmplified Bypass Block DiagramAmplified Bypass Block DiagramAmplified Bypass Block Diagram

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LLLLLLLL3002300230023002////4444 Optical ConnectivityOptical ConnectivityOptical ConnectivityOptical Connectivity

ExampleExampleExampleExample

LightLEADER 3002U

A 3-node network (A, B & C) were each site has an LL3002-U system

The table details the optical connectivity at the intermediate site (B), which

contains two ports equipment: Port1 towards site A and Port2 towards site C

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In1 Site A Out1Out1 Site C In1

Rx1 Port1 Rx (West)

Tx1 Port2 Tx (East)

In2 Site C Out2

Out2 Site A In2

Rx2 Port2 Rx (East)

Tx2 Port1 Tx (West)


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A modular 1U, 2U or 3U rack mountable, carrier class platform, meetingETSI-300mm & NEBS-12 specs and compliant with RoHS/WEEE

LynxPN Solutions

LigtLEADER-4000 Platform

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Support large number of hot swappable modules covering most of theprotection switching, bypass and fiber intrusion detection applications

Support power & control modules redundancy (both can be replacedwithout any disruption to traffic)

Managed via Cisco like CLI (over RS232 or Telnet), SNMPV1 agent,

Front panel LCD with push buttons, LED indications, Audible alarm(buzzer) with ACO (Alarm Cut Off) push button & LED, Dry contacts(critical, major, minor) alarm relay Embedded real-time Web BasedManagement, EMS/SMS system-(LynxVISION)

Download the product full datasheet at: http://www.lynxpn.com/content.asp?page=product_list&catId=5


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LynxPN SolutionsLynxPN SolutionsLynxPN SolutionsLynxPN Solutions

APSAPSAPSAPS----4325432543254325

A pluggable 1-slot module for the LightLEADER 4000 enclosure

Managed

Designed to bypass a single bidirectional through connection (e.g. 10Glink) upon site/rack electrical power outage or upon in-line equipmentfailure .

Modular- for multi-link (intermediate or mesh) sites:

APS-4325 Module

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modules can bypass up to 4 such links independently or in groups(e.g. 40GE LAG made of 4 10GE links)

LightLEADER 4000 2U enclosure equipped with 8 APS4325modules can bypass of up to 10 such links independently or ingroups (e.g. 80GE LAG made of 8 10GE links+2 independent10GE links) 8 links in LAG (e.g. total of 80G)

Key features: Programmable thresholds, Automatic/Manual reversionmodes, Automatic/Operator Switching Commands, Programmable waitto restore delay time.

Download the product full datasheet at: http://www.lynxpn.com/data/uploads/Brochures/Brochure_APS4325.pdf


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A 3-slot width plug-in module for the LighLEADER-4000 Platform

Supports protection of two bi-directional (fiber-pair) links with embedded,very low-loss (


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A low cost combined protection & bypass system

Su orts rotection of two bi-directional fiber- air

Lynx SolutionsLynx SolutionsLynx SolutionsLynx Solutions

LightLEADERLightLEADERLightLEADERLightLEADER 4301430143014301----i

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links and bypass switching of inline equipmentupon electrical power outage at the site

Better suited for short range links able to sustainmax. loss of 2.1 dB in bypass mode


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Some Network Engineering ConsiderationsSome Network Engineering ConsiderationsSome Network Engineering ConsiderationsSome Network Engineering Considerations

I. Although relatively simple and easy to install systems, severalengineering rules need to be applied to ensure optimal operation.

II. Powering the bypass system both the bypassed equipment and the

bypass system need to be powered off the same sourceGuarantees bypass occurrence if and only if the network equipment is affected by a powerfailure

II. Optical power/dispersion budget operators must ensure that the link

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two non-adjacent nodes, across a bypassed node

III. Traffic engineering/plans - The network connectivity changes duringnode bypass. Without proper precautions, networks may experiencemisconnections during bypass, associated with traffic that is normallyterminates at the bypassed node.


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Thank YouThank YouThank YouThank You

@lynxpn.com

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818-802-0244

For more information about the LightLEADER-4000 and its variousAPS modules please visit our web site: www.LynxPN.com

LynxPN Bypass Apllication Paper

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