Www.mrv.com Optical transport solutions LambdaDriver™ WDM Products line family Moshe Schnapp...
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Transcript of Www.mrv.com Optical transport solutions LambdaDriver™ WDM Products line family Moshe Schnapp...
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Optical transport solutions
LambdaDriver™WDM Products line family
Moshe [email protected]
www.mrv.com
Wave Division Multiplexing (WDM) principle
Multiple wavelengths transmission over single fiber
Multiple wavelengths transmission over single fiber
Input channelsInput channels Output channelsOutput channels
Ch#1Ch#1
Ch#nCh#n
Ch#1Ch#1
Ch#nCh#n
λ1 - λn λ1 - λnMuxMux DeMux
DeMux
WDM is a method of transmitting data from different sources over the same fiber optic link at the same time whereby each data channel is carried on its own unique wavelength.
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LambdaDriver® family overview Modular chassis for up to 16 wavelengths per shelf
DWDM (up to 64 wavelengths) or CWDM (up to 16 wavelengths)
Distances up to 100Km without repetition over Single or Dual fiber.
A distance longer than 100Km is reachable by use of Optical Amplifiers
Supports for Point-to-Point, Linear ADM and Ring topologies
Supports any data centric protocol up to 10Gbps
Sub-rate TDM (2:1, 4:1 and 8:1) per wavelength
Line/Path/Equipment Protection
Single or Dual fiber operationLD400
CWDM/DWDM
Budget
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LambdaDriver structure
MuxTransponder
Transponder
Transponder
Management
DeMux
WDM trunk
Server
λ1 λ1
λ1 λ1 λ2
λ2
λ2 λ2
λ3 λ3
λ3 λ3
850nm
1310nm
1550nm
Access channels at any wavelengths,selectable by SFP choice
Access channels at any wavelengths,selectable by SFP choice
Fiber managementtray
Mux/DeMux principle
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Typical Customer market
Targeted for the Metro and Regional rings in carrier
applications as well as Point to Point or Linear ADM
Enterprise networks.
Any solution can start with as low as 2 services and grow
up to 64 with in-field upgrades.
Ideally suited for storage (ESCON, FC1/2Gbps), IP (FE, GE)
or SDH (OC3 – OC48) applications
Smoothly upgrade to existing networks
SDH upgrade
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Unique Features and Benefits
The same platform supports both CWDM and DWDM technologies
and even can support both in the same network
LD1600 supports 16 CWDM channels that lowers the cost compared
to alternative DWDM.
Using Sub-Rate TDM modules for more efficient use of WDM channels
Up to 16 OC48 channels transmission over MM fiber up to 2Km
Single fiber bi-directional transmission option
Using SFP transceivers provides high flexibility and maintenance
inventory savings
example
Bands
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Housing and Chassis
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PowerSupplies
PowerSupplies
Mux/DeMuxMux/DeMux
ManagementManagement
1+1RED1+1RED
TranspondersTransponders
LambdaDriver® system configuration
TranspondersTransponders Mux/DeMux
Mux/DeMux ManagementManagement
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• No power needed• No additional configuration• LDP300 is 1U/19” size and host the standard LD800 OADM
modules• Interfaces directly to colored GBIC’s or LD transponders
LDP300
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LD1600 – Slot allocationT
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LD400 and LD800 - Slot allocationT
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Transponder # Transponder # DF-OADM4
Transponder # Transponder # Management
2 U
LD400
LD800
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Transponders and Amplifiers
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Transponder modules with SFP“ access” interface
Converts the access(gray) wavelength to WDM specific wavelength(and vice versa).
CWDM or DWDM versions of modules Hot swappable, independent modules SFP access interface for highest flexibility Rate transparent mode (2R): Open to any data rate. Performs 3R (reshape,retime,retransmit) function Remotely selectable data rate Loopback functionality Power Monitoring and SFP Digital diagnostics ALS - Automatic Laser Shutdown LIN – Link Integrity Notification
F/O SFP
10/100/1000BaseTx SFP
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TM2-SFP – SFP based Dual Transponder
SFP receptacles on all ports for maximum interface flexibility 2 independent light path’s for higher port density Preserves complete functionality of regular transponders Allows different rate setting for each light path Provides Full H/W redundancy with one module
F/O SFP
10/100/1000BaseTx SFP
TX1TX1
Working path
Protection pathTX2
TX2
RX2RX2
RX2RX2
TX1TX1
TX2TX2
RX2RX2
RX2RX2
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Regular SM fiber (G652) introduce 17-20ps/nm/km dispersion value that limits the 2.5Gbps transmission to about 90Km with regular transponders (TM –DSFP)
Usual approach is using DCU’s. Using special DWDM transponders allows transmission to long
distances (about 600Km) using Optical Amplifiers up to dispersion limits (up to 12,025 ps/nm) .
DWDM Transponders for high dispersion links
Site ASite A Site BSite B
BoosterBoosterPre OAPre OA
MUXMUX DeMUX
DeMUXTM-DSFP TM-DSFP200Km
Dispersion
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No OEO conversion. Can be used for Single channel or
for DWDM applications Can be placed after MUX(post),
before DeMUX(pre) or between sites (in line).
Only C and L bands can be amplified
EDFA Optical Amplifier modules
Site ASite A Site BSite B
Post OAPost OABoosterBooster Line OALine OA
Pre OAPre OA
MUXMUX DeMUX
DeMUX
EDFA principle
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4 x ESCON Multiplexer module
4 ESCON ports are TDM multiplexed for maximum
utilization of the available wavelengths.
SFP uplink provides high flexibility and inventory
savings
Using CWDM SFP uplink saves the cost of the
transponder
Single slot size, fitting any LD chassis
4 ESCONPorts
4 ESCONPorts 850/1310/CWDM
wavelength
850/1310/CWDM wavelength
Sub-rate MUXSub-rate MUX
4 x ESCONPorts
1Gbps uplink
SFP socket
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2 x GE/FC Multiplexer module
2 x GE or 2 x FC 1Gbps ports are TDM multiplexed into 2.5Gbps uplink
for maximum utilization of the available wavelengths.
SFP ports provide high flexibility and inventory savings
Using CWDM SFP uplink saves the cost of the transponder
Single slot size, fitting any LD chassis
3 types:
– All ports SFP
– CWDM uplink port
– DWDM uplink port
2 GE/FCPorts
2 GE/FCPorts
850/1310/CWDM wavelength
850/1310/CWDM wavelength
Sub-rate MUXSub-rate MUX
2 x GE/FCSFP ports
2.5Gbps uplink
SFP socket
Fixed WDMport
SFP WDMport
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10Gbps Transponders
XFP access interface for highest flexibility DWDM interface at ITU-T grid Long distance – up to 80Km 10GE or STM64 with FEC versions In field/In service upgrade of existing CWDM/DWDM
networks
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1GE +8xE1+RS232 TDM module
SFP access interface for highest SFP access interface for highest flexibility or fixed WDM port optionflexibility or fixed WDM port option
Choice of 1 to 8 E1/T1 ports (with external Choice of 1 to 8 E1/T1 ports (with external cabling)cabling)
E3/DS3 port option instead of 8 x E1’s.E3/DS3 port option instead of 8 x E1’s.
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Mux / DeMux modules
Mux/DeMux modules are used for Multiplexing / Demultiplexing different wavelength to a trunk.
The Mux/DeMux modules are used in a point-to-point connection or at a central PoP of a star or ring structure.
There are different Mux/DeMux modules required for CWDM and DWDM.
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10GE upgrade of CWDM network
More than one 10GE upgrade
CWDMMUX
DWDMMUX
1470nm1610nm
CWDM+DWDMTrunk
CWDMMUX
1470nm
1550nm
CWDM+DWDMTrunk
10GE Transponder
One 10GE upgrade
10GE Transponder
10GE Transponder
10GE Transponder
10GE Transponder
10GE Transponder
10GE Transponder
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OADM Terminology
0.6 dB loss
Common Channel
Express Channel
When building a Ring or Linear ADM topology only part of the wavelengths need to be dropped/added at every node.
OADM’s – “pass through” without substantial attenuation all the channels that are not dropped.
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Add/drop Multiplexer (OADM) Modules
1 to 4 channels standard (other – per request) Any combination of channels
Add 1
Add 2Drop 1
Drop 2
OUTIN
Add 1 Drop 2
Common In
Common Out
Express Out
Express In
Drop 1Add 2
Dual OADM interface Single OADM interface
WDM trunkports
ADD/DROP ports
Applications
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WDMManagement
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Management Module
Runs the management tasks and interfaces external managers by means of SNMP, Telnet or CLI.
Web based management option with MegaVision™
Provides configuration and link fault monitoring
OSC (Optical Service Channel) allows management of the remote unit using separate wavelength.
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System Management
Full support for all MRV products
Discover and monitor any vendor’s TCP/IP or SNMP device
Remotely accessible from anywhere, via standard Internet Web Browser
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Optical Service Module
Provides remote connectivity for NMS.
Management port uses 1300nm wavelength (FE)
Management Data is added to “Colored” Data and sent on the WDM trunk.
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Optical Supervisory Channel
SRV
1310nm
Management
station
Mux
Transponder
Transponder
Transponder
Management
WDM
Supervisory channel addition
SRV Mux
Transponder
Transponder
Transponder
Management
1310nm
LANNo LAN at this location
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Using SRV module for other applications
FiberFiber
1310nm Multiplexed Signals
Mux
Transponder
Transponder
Transponder
Management
WDM
SRV
Supervisory channel addition
IDC
STM x n
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WDMRedundancy concepts
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1+1 Protection Module
Provides automatic optical protection for the WDM link.
Mostly implemented in point-to-point (P-t-P) and linear ADM network topologies, when placed between the Mux/DeMux and the WDM link.
In ring topologies it can be placed between transponder and OADM’s, providing path (wavelength) protection.
1+1 redundancy can be ordered with OSC (Optical Supervisory Channel) on the same module.
Provides WDM signal splitting on the transmit side and protection switchover on the receiver side within less than 25ms.
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Path and Link Protection
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Link backup with the 1+1 Protection Module
MUXMUX Primary linkPrimary link
Secondary linkSecondary linkDeMUXDeMUX
Opticalswitch
Opticalswitch
Powersplitter
Powersplitter
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Only Fiber (Link) protection with 1+1 module per channel
One transponder and one 1+1 module per service connected to dual fiber ring for O-BPSR protection.
The switching is done by 1+1 module in less than 25ms No H/W redundancy (except OADM)
GEGE
λ1 – λ8 λ1 – λ8
TransponderTransponder
λ5λ5
λ5λ5
λ1 – λ8 λ1 – λ8
EASTOADM
EASTOADM
WESTOADM
WESTOADM
LD800LD800
Dual Fiber Ring1+1
redundancymodule
1+1 redundancy
module
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Full HW and Fiber (Link) Protection including customer’s ports
2 transponders with the same or different WDM wavelength connected to dual fiber ring for O-BPSR protection.
Two ports are allocated for customer’s equipment, providing redundancy for the ports of the customer’s equipment.
The switching is done at the terminal equipment.
λ1 – λ8 λ1 – λ8
TransponderTransponder
TransponderTransponder
λ5λ5
λ5λ5
λ1 – λ8 λ1 – λ8
EASTOADM
EASTOADM
WESTOADM
WESTOADM
STM16STM16
STM16STM16
LD800LD800
Dual Fiber RingIDC
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Full HW and Fiber (link) protection (one customer Interface)
2 transponders with the same or different WDM wavelength connected to dual fiber ring for O-BPSR protection.
One port is provided by the customer’s equipment. The signal splitting is done by Y-cable. The switching is done by the LD hardware in less than 15ms.
λ1 – λ8 λ1 – λ8
TransponderTransponder
TransponderTransponder
λ5λ5
λ5λ5
λ1 – λ8 λ1 – λ8
EASTOADM
EASTOADM
WESTOADM
WESTOADM
Y-cableY-cable
LD800LD800
Dual Fiber RingY-cableY-cable
Working module
Redundant module
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P-t-P topology; only the Fiber (link) is Protected (redundant)
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P-t-P; a fully redundant topology
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P-t-P; Redundancy with a Y cable
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Ring – Fiber only redundancy
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Ring – Fiber (Link) redundancy (BO-2)
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Ring – Fiber (Link) redundancy (BO-3)
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WDM Typical applications and case studies
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PtP with redundancy
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Ring topology
LD1600
Single/Dual
Fiber Ring
Single/Dual
Fiber Ring
Server
Server
IDC
IDC
LD800
LD400
LD800
Server
Server
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Star – Multiple Point-to-Point
IDC
Server
Server
ServerServer
Server
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LDP300 - Passive distribution at the concentration middle point
LD400LD400
Server
Server
LD800
LDP300
Switch with colored GBIC 4 X ESCON
GE
4 X ESCON
GEGE
GEGE
GE
TDM aggregation
TDM aggregation
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32 DWDM channels configuration using two LD1600
32 wavelengths DWDM trunk
32 wavelengths DWDM trunk
16 “Red”channels
16 “Red”channels
16 “Blue”channels
16 “Blue”channels
32 channels Mux/DeMux32 channels Mux/DeMux
1. When 32 channels needed at the initial stage and a 64 channels upgrad is planned – it is recommended to use 32 channel Mux/DeMux module with a band splitter
2. When 32 channels needed only in the future – it is recommended to start with 16 channels “Blue” Mux/DeMux module with band splitter and add the 16 channels “Red” Mux/DeMux module at the upgrade stage
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Case Study – SAB Germany
The customer – SAB, a bank needed fully redundant DWDM connection between two branches for Fibre Channel and Gigabit Ethernet services.
Two parallel links were proposed. In case of fiber or hardware failure, the Brocade switch (FC) or the router (GE) would perform the link switchover.
LD800 price/performance and MRV’s strong local support advantages convinced the main contractor (Siemens) to chose the LD800 as a preferred solution.
Fully redundant Point to Point linkFully redundant Point to Point link
4 x FC4 x FC
4 x FC4 x FC
4 x FC4 x FC
4 x FC4 x FC
GEGE GE
GEWDM link
WDM link
LD800
LD800
LD800
LD800
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Case Study
MRV‘s / Ascom‘s Solution:MRV‘s / Ascom‘s Solution:• LD800 Chassis, 2 x PS
• Management Module
• 1+1 Module
• CWDM Mux and DeMux modules
• 6 x CWDM Transponder Modules
End-users Starting Position:End-users Starting Position:• Multiple Pairs of Dark Fibers
• Rented from Swisscom
• Distance Ile A/B to Lancy approx 10km
• 4 x FC 1Gig, upgradable to 2Gig
• 2 x GigE
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Case Study – Orange Romania
The customer – Orange Romania, a GSM carrier, needed a flexible solution with fiber protection and low initial cost, but with good upgrade path for gradual expansion of the network.
The first step was connecting two sites with 1+1 fiber redundancy providing FC and GbE services.
At the second stage a third site was added with different services allocations. Modules re-location and configuration changes were possible due to the modular structure of LD800, saving equipment cost.
LD800 price/performance and flexibility for in field configuration changes were the reasons for main contractor IBM Romania to chose MRV solution.
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Road map
4/8 x FE TDM module – Q1/2005 4/8 x STM1 – Q1/2005 4 x STM4 – Q1/2005 10 x GE/FC into 10Gbps TDM – Q2/2005 4 x STM16 into 10Gbps TDM – Q2/2005 Tunable laser transponder – Q2/2005 Tunable OADM (ROADM) – Q3/2005
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IBM Total Storage certified and others to come
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Thin film Multiplexer/Demultiplexer
Passive units which combine (Multiplex) number of incoming fibers into one fiber and splits (DeMultiplex) one fiber into number of outgoing fibers using wavelengths filters.
MuxMux
λ1λ1
λ2λ2λ3λ3
λ4λ4
Multi-wavelength signalMulti-wavelength signal
DeMuxDeMuxλ4λ4
λ3λ3
λ2λ2
λ1λ1
Back
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Go Back!
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WDM versus TDM
Function WDM SDH/SONET
Scalability Just light on new wavelength
Costly and inefficient upgrade
Provisioning with fiber in place
Within days Months
Long distances transmission
Optical Amplification Expensive Electrical Repeaters
Protocol/Bit rate transparency
Yes, only clock retiming option
No,
Protocol/frame processing
Bandwidth limits Potentially unlimited – 2Tbps?
40Gbps?
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WDM simplifies distance extensions and lowers upgrade costs
80Km80Km
RPTRRPTR 80Km
80Km
RPTRRPTR 80Km
80KmOC48
OC48OC48OC48
80Km80Km
80Km80Km
4 x OC484 x OC484 x OC48
4 x OC48
DWDM Transmission – 10GbpsDWDM Transmission – 10Gbps
TDM Transmission – 10GbpsTDM Transmission – 10Gbps
80Km80Km
OAOA
OAOA
80Km80Km
RPTRRPTR 80Km
80Km
RPTRRPTR 80Km
80KmOC48
OC48OC48OC48
80Km80Km
RPTRRPTR 80Km
80Km
RPTRRPTR 80Km
80KmOC48
OC48OC48OC48
80Km80Km
RPTRRPTR 80Km
80Km
RPTRRPTR 80Km
80KmOC48
OC48OC48OC48
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Optical Transmission Bands
Bands:Short 1470-1530nmConventional 1530-1570nmLong 1570-1610nm
Bands:Short 1470-1530nmConventional 1530-1570nmLong 1570-1610nm
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DWDM versus CWDM
Frequency (THz)
Wavelength(nm)
196.1 (ch#61) 1528.77
196.0 (ch#60) 1529.55
195.9 (ch#59) 1530.33
192.0 (ch#58) 1561.42
191.9 (ch#57) 1562.23
191.8 (ch#56) 1563.05
191.7 (ch#55) 1563.86
ITU Grid Standard(G692)ITU Grid Standard(G692)
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DWDM versus CWDM
Parameter DWDM CWDM
Inter channel spacing As low as 0.2nm 20nm
Number of channels More than 160 Up to 16
Optical Amplification Yes Very expensive and complicated
Technological complexity High Medium
Price per channel (two sides) ~20K$ ~12K$
Market Long haul, Metro
Metro, Access, Large enterprise
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Maximum distance with Gbps protocols
# channels CWDM DWDM without EDFA
DWDM with EDFA
4 27db/108km 29db/116km 35db/140km
8 25db/100km 27db/108km 33.5/134km
16 21db/84km* 23db/92km 31/124km
*requires special fiber
Back
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•Transmitted data can be thought of as pulses of light. When there is a pulse - “1”, when there is no pulse - “0”.•Fiber is the transmission medium. When light travels down the fiber, the pulses spread out (similar to a freeway where cars in the fast lane travel faster than cars in the slow lane).
•This causes problems when trying to determine if a “1” or a “0” is being received in a given data slot. •When dispersion limit is stated in a spec sheet, it usually gives a distance (km) or a pulse spreading unit (ps/nm) that limits the distance. Associated with this number is a 1 or 2 dB power penalty (hit on link budget).
Dispersion
1 0 1 1 ? 1
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•Dispersion is measured in ps/nm/km, meaning that for every km of fiber traveled through, a pulse with a 1 nm spread of wavelengths will disperse by 1 ps for a dispersion of 1 ps/nm/km
•Typical dispersion parameters of fibers : SMF – 17 to 19 ps/nm/kmNZ-DSF – 2 to 6 ps/nm/kmDSF – 0 to 1 ps/nm/km
•DFB lasers have about 0.2 nm range of wavelengths. Therefore with a 1 ps/nm/km chromatic dispersion, a 10-Gbit/s pulse with a 0.2nm spectral width will have spread by a whole bit period (100 ps) after 500 km of fiber and will then be completely indistinguishable.•With the same lasers 2.5Gbps pulses will be indistinguishable after 100Km with regular SMF!
Dispersion calculations
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Dispersion Compensation
• Dispersion compensation is used to reshape the pulses (equivalent to changing the speed limits on the highway such that the fast lane travels slow while the slow lane catches up)•Dispersion Compensation Unit (DSU) – A fiber of opposite dispersion that compensates dispersion effects of regular transmission fiber•Compensation is available in 1U boxes from fiber vendors, in increments from 10-80km. Optical Amplifiers are needed to compensate DCU’s attenuation.•Lambda Driver transponders have the option of using laser with narrow wavelengths spread allowing distances of up to 640Km with 2.5Gbps rate without the need for DCU
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Go Back!
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3 options for upgrading SONET ring:
1. Replace equipment, like OC48 to OC192
2. Install a new ring on new or existing dark fiber
3. Install one or more new rings by deploying WDM over existing
fiber.
May be the most important application in the near term!
Upgrading SONET/SDH
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Migration steps from SONET/SDH to WDM
11
22
33
Exchanging SONETADM’s with OADM’s
Exchanging SONETADM’s with OADM’s
Direct interfacingWith edge equipment
Direct interfacingWith edge equipment
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Migration from CWDM to DWDM
1470nm 1490nm 1510nm 1530nm 1550nm 1570nm 1590nm 1610nm
8 DWDM channels insertion into one CWDM filter
CWDMMUX
DWDMMUX
1470nm
1550nm
1610nm
1547.72nm 1553.33nm DWDM channels1549.32nm 1550.92nm 1552.52nm1548.51nm 1550.12nm 1551.72nm
0.8nm spacing
20nm spacingCWDM+DWDM
Trunk
back
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Lambda Driver delivers Full Spectrum CWDM transmission
1270
1290
1310
1330
1350
1370
1390
1410
1430
1450
1470
1490
1510
1530
1550
1570
1590
1610
O1O2O3O4O5E1E2E3E4E5S1S2S3C1C2L1L2L3
NEWSPECTRUM
01250 1300 1350 1400 1450 1500 1550 1600
Wavelength (nm) 1650
wavelength (nm)E U
0
0.3
0.6
0.9
1250 1300 1350 1400 1450 1500 1550 1600Wavelength (nm)
Los
s (d
B/k
m) O
1650
LCSSMF
(water peak exists)
Dis
per
sion
(p
s/n
m.k
m)
SMF/AllWave® fiber(same dispersion)
AllWave® fiber(water peak removed)
1.2
-10-10
0
10
20
Using fibers without the water peak provides more service capacity by utilizing the E zonewhile Preserving All SMF Capabilities: Identical splicing Identical dispersion Identical 1310 and 1550nm reach Identical nonlinear behaviors
Using fibers without the water peak provides more service capacity by utilizing the E zonewhile Preserving All SMF Capabilities: Identical splicing Identical dispersion Identical 1310 and 1550nm reach Identical nonlinear behaviors .
ITU-T G694.2
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#7
#7
Dual Interface OADM operation
Trans- ponder
#7
Trans- ponder
#7
End-gerät 1
End user 2
DF OADM-1DF OADM-1
DF OADM-1DF OADM-1
All channesPass besides
ch #7
All channesPass besides
ch #7
#7
#7
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#1
#4
Left 2 Left 3 Left 4Left1 Right 2 Right 3 Right 4Right1
Dual Fiber OADM with 4 channels
DF OADM-4
#1
#4
#1
#4
#1
#4
DF OADM-4
All channels besides #1 - #4
All channels besides #1 - #4
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#7
#7
Single Interface OADM
Trans- ponder
#7
Trans- ponder
#7
End user 1
End user 2
All channesPass besides
ch #7
SF OADM-1SF OADM-1
SF OADM-1SF OADM-1
All channesPass besides
ch #7#7
#7
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2 transponders with the same or different WDM wavelength connected to dual fiber ring for O-UPSR protection.
Two ports are provided to terminal equipment, providing terminal based redundancy.
The switching is done at the terminal equipment.
Full HW protection, including customer ports – terminal based protection
λ1 – λ8 λ1 – λ8
TransponderTransponder
TransponderTransponder
λ5λ5
λ5λ5
λ1 – λ8 λ1 – λ8
EASTOADM
EASTOADM
WESTOADM
WESTOADM
STM16STM16
STM16STM16
LD800LD800
Dual Fiber Ring
IDC
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2 transponders with the same or different WDM wavelength connected
to dual fiber ring for O-UPSR protection.
One port is provided by customer equipment.
The signal splitting is done by Y-cable.
The switching is done by the LD hardware in less than 15ms.
Full HW protection with one customer port – transport based protection
λ1 – λ8 λ1 – λ8
TransponderTransponder
TransponderTransponder
λ5λ5
λ5λ5
λ1 – λ8 λ1 – λ8
EASTOADM
EASTOADM
WESTOADM
WESTOADM
Y-cableY-cable
LD800LD800
Dual Fiber RingY-cableY-cable
Working module
Redundant module
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2 transponders ON THE SAME MODULE with the same or different WDM
wavelength connected to dual fiber ring for O-UPSR protection.
One port is provided by customer equipment.
The signal splitting is done by Y-cable.
The switching is done by the LD hardware in less than 15ms.
Full HW protection with one customer port and one module (TM2-SFP)
λ1 – λ8 λ1 – λ8
Dual Transponder
Dual Transponder
λ5λ5
λ5λ5
λ1 – λ8 λ1 – λ8
EASTOADM
EASTOADM
WESTOADM
WESTOADM
Y-cableY-cable
LD800LD800
Dual Fiber RingY-cableY-cable
Redundant path
Working path
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One transponder and one 1+1 module per service connected to
dual fiber ring for O-UPSR protection.
The switching is done by 1+1 module in less than 25ms
No H/W redundancy (except OADM)
Fiber only protection with 1+1 module per channel
GEGE
λ1 – λ8
λ1 – λ8
TransponderTransponder
λ5λ5
λ5λ5
λ1 – λ8
λ1 – λ8
EASTOADM
EASTOADM
WESTOADM
WESTOADM
LD800LD800
Dual Fiber Ring1+1
redundancymodule
1+1 redundancy
module
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EDFA - Erbium-doped fiber amplifier
EDFA Principle
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