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2Confidential Information of Huawei.

No Spreading without Permission. Security Level: Internal

Preface

How to design a WDM network?

How to configure a WDM network


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Learning Object

Understand the design method and

design step of a WDM network;

Design a WDM network independently;

After the lesson, you may:


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Content of Lesson

Section 1 Structure of Optical transmission network

Section 2 Key points of network design

Section3 System design of OptiX DWDM


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Section 1 Structure Of Optical Transmission Network


6/64



TDM Data Transport

44%

Voice

43.7%

IP12.3%

0%

10%

20%

30%

40%

50%

60%

70%

Voice Data IP

64.7%

21%14.3%

More than 80% revenue still comes

from TDM based service.IP accounts for more than 60% of the

payloads with 40% increase per year.Source: RHK

Service Category On Transmission Network

Bandwidth utility and revenue generation remains unbalanced for

future years.


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DC0

DC 1

DC 2

Intl Switching Gateway

LS LS

MS

LongtollSwitching

LocalSwitc

hing

National BackboneSwitching network

Province/MetropolitanSwitching network

Model of TDM Service


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8Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal

MetropolitanAggregation

National Backbone

Province/MetropolitanBackbone

MetropolitanAccess

Model of IP Service

Intl Switching Gateway


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Aggregation Layer

Accessing Layer

Long HaulLayerNational Backbone

Province Backbone

Metropolitan Aggregation

Province Aggregation

Structure of Transmission network


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STRASBOURG

GENEVA

LYON

MONTPELLIERTOULOSE

BOURDEAUX

NANTES

REIMS

PARISRENNES

691 km

622 km

OptiX BWS OTM

OptiX BWS OADM

France

39 stations

Ring perimeter 3311km.

SuperWDM Technology

National Backbone

France LDCOM

Distributed services, largest traffic, fewest nodes


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Province BackboneChina Telecom

: OptiXBWS 320G OTM OptiXBWS 320G OLA

1

89.4 km

87 km

99.2 km

58.8 km

81.4 km

51.5 km 56.9 km

75 km40 km 81.4 km52.4 km

62.2 km

98.5 km

113.7 km

2

119.8 km

83.7 km

67.8 km

60.8 km

24.1 km

81.1 km 91.65 km 44.72 km

OptiX10G

78 km

40 km

iManager

T2100/T2000

Distributed services ,largest traffic, fewest nodes


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Backbone Layer

Aggregation Layer

iManager T2000

iManager T2000

Aggregation LayerChina Mobile

Voice: Distributed & Centralized

IP: Centralized

Moderate traffic, more nodes


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Legend

OptiX10G

OptiXMetro3000

Aggregation Layer

Accessing Layer

Centralized Service

Small traffic, A great deal of Node

STM 64 ring

STM 64 ring

Aggregation/Accessing Layer

China Telecom


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National/Province

Backbone

Metropolitan

Backbone

Metropolitan

Aggregation

Metropolitan

Accessing

Topology Ring, Lin e Ring Ring Star, Lin e

Capacity DWDM1.6T

SDH10G

SDH 10G

SDH 2.5G

SDH 2.5G

SDH 622M

Compact

SDH622M

Grooming Large traf f ic

(Opt ical&

Electr ical)

Moderate

traff ic

(Electrical)

Aggregat ion

(Electrical)

Aggregat ion

(Electrical)

Protection MSP MSP/SNCP SNCP/PP PP/TPS

Summary of Different Layers Character


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15

Confidential Information of Huawei.


OptiX Series Product


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16



Two different points when building optical network

Network first, Service second

Fit for long haul backbone

network and metropolitan

backbone network, DWDM

network is preferred.

Fit for aggregation/Accessingnetwork,customer premise

equipment (CPE) is usually used

for its easy installation and

maintenance.

How to design optical transmission network

Service first, Network second


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18



Node type design

Protection design

DWDM wavelength allocation design

Interface type design

Section 2 Key Points of National backbone design


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19



A

B

C

D

E

F

RED: Large traffic

BLUE: Moderate traffic

BLACK: Small traffic

OTM

OADM

OLA

Node Type Design


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20



TDM services must be transmitted through SDH system

IP service may be transmitted through SDH system, and may be mapped

into DWDM system directly as well, but at present perfect protection can be

provided when using SDH system.

EDFA

OptiX

10G

OptiX

10G

BWS

1600G

BWS

1600G

Node Type Design


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21



Node type design

Protection design



Key Points of National backbone design


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22



Protection Policy Efficiency Economy

Wavelength

ProtectionGood Cheaper

Channel

Protection

Moderate Cheap

Line

ProtectionBetter Moderate

Multiplex Section

ProtectionBest Expensive

Note: Normally, Cost of DWDM system protection is far more

expensive than that of SDH system protection.

Protection


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23



Node type design

Protection design





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24



Line topology

EDFA

OptiX10G

OptiX10G

BWS

320G

BWS

320G

4F4F

2F 2F

A BBi-direction

E W E W

A B

1

2

3

SDH Channel

IP Channel

Main channel

Protection channel



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25



BWS

1600G

BWS

1600G

BWS

1600G

BWS

1600G

BWS

1600G

BWS

1600G

BWS

1600G

BWS

1600G

A

H

G

F E

D

C

B

Ring topology

BWS

1600G

BWS

1600G

OTM

OADM



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26



OptiX 10G

B

DG

E

HOptiX 10G

OptiX

10G

A

F

COptiX 10G

OptiX 10G

OptiX 10G OptiX 10G

OptiX 10G

OptiX 10G

Ring1

Ring2

Ring3

OptiX 10G

Note:

Ring1 and Ring2 deploy 4 fiber MS-SPRING .

A~F: GEProtection, A~G: GENo Protection,

D~F: GENo Protection


F


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27



E W E W E W E W E W E W E W E W E W

1 Ring1

2

3 Ring2

4

5 Ring3

6

7 GE8 GE

9 GE

10

32

A B C D AE F G H

R

R

R

R

R

R

R

R

R

R

R Regenerator



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28



Node type design

Protection design





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29



PPPGFP

PDH/STM-N GE

Mux / DeMux

IP

TDM

More and more Data services are required to transport through

DWDM network directly, so that plenty of Data interfaces appear to

satisfy requirements, such as IP, FICON, Fiber channel.



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30



Content of Lesson

Section 1 Structure of Optical transmission network

Section 2 Key points of network design

Section3 System design of OptiX DWDM


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31



OptiX Metro6100

Network DesignB

OptiX BWS 1600GNetwork Design


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32



system type TypeI TypeII TypeIII TypeIV TypeV

capacity 1600G 800G 400G 400G 100G

bandC-band &

L-bandC-EVEN &

L-ODDC-EVEN L-ODD C-EVEN

Spacing 50GHz 100GHz 100GHz 100GHz 100GHz

max. 160 80 40 40 40

max. bit -rate

10Gbit/s 10Gbit/s 10Gbit/s 10Gbit/s 2.5Gbit/s

max. output

power +1dBm +4dBm +4dBm +1dBm +4dBm

Fiber G.652/ G.655 G.652/ G.655 G.652/ G.655 G.653 G.652/ G.655

1600G System Networking Structure

Different system type, different design rule!


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33



How to design an LH DWDM System

Input: Service TopologicalFiber specification

(Attenuation/dispersion)

Site Type and Location

(OTM/OADM/OLA)

DCM & Mux/DeMux

Amplifiers

OSNR Ok?

Adding REG

N

Y

Output:Network Diagram/Rack layout/Quotation


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OTU

OTU

1

n

OTM OLA OTM

BA

OSC OSC

DCMDCM

OSC

DCM

MUX

OTU

OTU

1

n

DEMUX

PA BA PA BA

G.652

Module Distance Insertion loss

DCM(A)-C 20km 4dB

DCM(B)-C 40km 5dB

DCM(C)-C 60km 7dB

DCM(D)-C 80km 8dB

DCM(E)-C 100km 9dB

G.655

Module Distance Insertion loss

DCM(A)-C 20km 4dB

DCM(B)-C 40km 5dB

DCM(C)-C 60km 6dB

DCM(D)-C 80km 7dB

DCM(E)-C 100km 8dB

Design Rule of 400G System 1: DCM

We can adopt dispersion compensation to overcome dispersion limitations.


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35



2. Rule of calculating DCM in G.652 Fiber No SuperCRZ)

The best dispersion of OLA/OADM should be -20km~35km(-400~700ps/nm)but it also

can be -40km~60km (-800~1200ps/nm), in the beginning, it can not use larger than DCM-Bto pre-compression.

In the transmission end, the dispersion should be -20km~35km(-400~700ps/nm)in other

word, the OTU can work under this condition, but it will be better if the dispersion is

5km~25km (100~500ps/nm)

With G.652 Fiber, Dispersion should be no more than 30km for single hop,no more than 25km for multi-hops

Limitation of OTUs dispersion + DCM Margin(10~15km)= distance (km)

How to calculate the DCM:

For calculate easier, we calculate the DCM base on the distance (km) instead of span

dispersion.

1. General rule of calculating DCM

3. Rule of calculating DCM in G.652 Fiber SuperCRZ)

It need total compression. In the transmission end, the dispersion should be -

10~10km.

Design Rule of 400G System 1: DCM


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36



attenuationDistance attenuation coefficient (Fiber loss + Spice loss)Margin

all Optical connector loss

1.line attenuation

2.Key point of optical power budget

OTU O

M

O

D

OTU

OTU Received SensitivityAmplifier Received SensitivityOutput Power Line loss Line loss

Design Rule of 400G System 2: Amplifier


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37




a The output power of all sites (OTM/REG/OADM/OLA) locked at +4dBm

b choose the right amplifier by the received optical power,

c the gain of amplifier must guarantee that the next amplifier/OTU(in OADM &

OTM) can work.

3.Amplifier design rule

10G OTU > -14dBm

2.5G OTU > -14dBm (PIN)

2.5G OTU > -22dBm (APD)

10G OTU: LWF/OCU/LRF

2.5G OTU: TWC/LWC/LWM/LWX/LDG

Notes: the needed received power of OTU


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38



Module Inserting lossdB Remark

D40/M40 8/8dB

V40 13dB

MR2 Add/drop:2.5dBMax

Input (In)- output (Out) pass-

through:3dBMax

FIU-C/FIU-L 1dB Concern 1 unit of FIU insertion loss

when using Laman

FIU-U/FIU-P 1.5dB Concern 1 unit of FIU insertion loss

when using Laman

VOA (Electrical) 2dB

VA4 (Electrical) 2dB

SCS (Single Mode

Coupling loss)

3.5dB

OLP transmitting3.5dBreceiving

1.5dB

DGE 16dB Tunable range:0~10dB

DSE 10dBincluding DCM


The inserting loss


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39



M

40

D

40

SC1 SCC

LWF

LWF

LWF

LWF

F

I

U

OAU

OBU

s

s

1

n

1

n

M

40LWF

OBU

SC1SCC

D

40

LWF

LWF OAU

F

I

U

1

n

s

s

1

n

OTM

SC2

SCC

OAU

OAU

F

I

U

F

I

U

s

OLA OTM

LWF

DWDM System overview 1


Power Budget

f G S f


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40



F

I

U

OAU

OBU

s

s

L

WF

L

WF

L

WF

L

WF

L

WF

L

WF

F

I

U

L

WF

L

WF

OBU

OAU

SC2

MR2

MR2

s

s

SCC

1 2 31 4

3 41 2

OADM

M40

D

40

SC1 SCC

LWF

LWF

LWF

LWF

LWF

F

I

U

OAU

OBU

s

s

1

n

1

n

OTM

DWDM System overview 2


Power Budget

MR2


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41



LWC16dB

LWF20dB

LWM/LWX/LDG: 20dB

LWF Super WDM: 17dB

OSNR limitation of different OTUs

OSNR is the most important parameter that

ensure the networking rationality.

Design Rule of 400G System 3: OSNR


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42



Case of BWS 1600G (Type III)

National Backbone Network


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E E

E E

Network topology diagram

LA LA

ZARIA DAN GORA KANOKADUNA

77Km

20.05dB

71Km

18.5dB

69Km

17.95dB

OAU

77km

20.5+3dB

OBUM

40

D

40OBU

71km

18.5+3dB

D

40

M

40OBU

OBU

G.652 G.652 G.652

69km

17.9+3dB

OAU

OAUOAU

OSNR=26.75dB

ZariaKADUNA Dan Gora KANO

Working wavelength

1, 210G3~ 4 0 For future use

1

KADUNAKANO

2


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44



Rack Layout diagram

Power & Alarm

Connection Panel

Connection Panel

Cover

HUB

KADUNA

Connection Panel

Connection Panel

M

4

0

O

B

U

F

I

U

S

C

2

S

C

C

O

B

U

D

4

0

1 2 3 4 5 6 7 8 9 10 11 12 13

Power & Alarm

Connection Panel

Connection Panel

Cover

DCM EDCM E

ZARIA

OAU

FIU

SCC

SC2

FIU

OAU

1 2 3 4 5 6 7 8 9 10 11 12 13

Power & Alarm

Connection Panel

Connection Panel

Cover

DCM EDCM E

DAN GORA

M40

OBU

FIU

VOA

SCC

SC1

OAU

D40

1 2 3 4 5 6 7 8 9 10 11 12 13

Power & Alarm

Connection Panel

Connection Panel

Cover

LWF

LWF

SCE

1 2 3 4 5 6 7 8 9 10 11 12 13

HUB

KANO

LWF

LWF

SCE

1 2 3 4 5 6 7 8 9 10 11 12 13

O

A

U

F

I

U

S

C

C

S

C

2

F

I

U

O

A

U

1 2 3 4 5 6 7 8 9 10 11 12 13


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45



HAM GHA KA TEH

359km 110km 55km

BAB SEM

243km190km

Exercise: Network topology diagram


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46

Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal

Exercise: DISTANCE & ATTENUATION

ORIGIN DESTINATION DISTANCE ATTENUATION(dB) FIBER

HAMEDAN RAZAN 102 23.5 G.652

RAZAN TAKESTAN 120 30 G.652

TAKESTAN GHAZVIN 37 9.3 G.652

GHAZVIN KARAJ 110 32.3 G.652KARAJ TEHERAN 55 12.7 G.652

TEHERAN GARMSAR CITY 132 33 G.655

GARMSAR CITY SEMNAN 111 25.5 G.655

SEMNAN FIROOZKUH 80 18.4 G.655

FIROOZKUH BABOL1 110 32.5 G.655


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HAMEDAN GHAZVIN KARAJ TEHRAN SEMNAN BABOL1

HAMEDAN STM-64P 2xSTM-16 STM-64

STM-64P

4xSTM-16

2xGE

GHAZVIN STM-64P STM-64 2XSTM-64

KARAJ 2xSTM-16 STM-642xSTM-16

STM-64

STM-64

TEHRAN STM-64 2xSTM-642xSTM-16

STM-64

STM-64

SEMNAN STM-64 STM-64

BABOL1

STM-64P

4xSTM-16

2xGE

STM-64STM-64

Exercise: Service Matrix Diagram


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48


OptiX Metro6100

Network Design

OptiX BWS 1600GNetwork Design


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49


How to design Metro WDM NetworkMetro6100

1To confirm network topologic and service

2To confirm site type (parallel-OADM/OTM, Series-OADM and OLA)

3Wavelength allocation => Lasers type of OTU (Long/short )

4Dispersion => DCM

5Optical Budget => To confirm amplifier

6Calculate OSNR

7Protection

8Rack layout

9Quotation


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1 To confirm network topologic and service

Chain or Point to Point

OADM

OADM

OADMOADM

Ring

Notes:

Ring is more popular because of the protection


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2 To confirm the site type

parallel-OADM/OTM:add/drop more than 8 wavelength, build by M32/D32

Series-OADM

add/drop less wavelength, no more than 8 wavelength

build by MR2/MB2

Notes:

When OSNR is low, the electric-regenerator OTU is need.


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Wavelength allocation

E W E W E W E W E W

1 FC(2G)2 4xSTM-16 GE,STM-4

3

4

5 STM-64

6 STM-64

7 2xGE8 STM-64

9

10

32

AA B C D

3 Wavelength allocation and OTU type


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53


Laser type of OTU

3 Wavelength allocation and OTU type

2.5G: LWX

LWM

LDG

LQS

LWCPoint of Sn180km laser

Typical launched power

0dBm -3dBm for

double transmit

2640km laser

Typical launched power-2dBm-5dBm for

double transmit

Point of Rn

1PIN Received module

Sensitivity

-18dBm

2APD Received module

Sensitivity-25dBm

10G

LWF40km laserTypical launched power-4dBm

Typical received sensitivity-14dBm

If the distance is longer than 35km,

The DCM is need.

Notes:

Choose the right OTU by distance (laser type) and amplifiers

(received module PIN/APD )


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1WBA05Input power -28dBm~ -6dBm,Gain 20dB;



Amplifier Type Introduction

5 Optical Budget: amplifier


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5 Optical Budget: insertion loss

Module Insertion lossdB Remark

D32/M32 8/8dB

V32 13dB

MB2 Add/drop:3.5dBMax

Input (In)- output(Out) pass-through:1.5dB

Max;

Input (In)- BMO pass-

through:0.7dB(Max);BMI-output(Out) pass-

through:0.7dBMax

other bands pass

through wavelengths

Input (In)- MRO pass-

through:2.5dB(Max);MRI-output(Out) pass-

through:2.5dBMax

pass through

wavelengths for MR2

MR2 Add/drop:2.5dBMax;

Input (In)- output(Out) pass-through:3dB

Max

Input (In)- MO pass-through:1.5dBMax

MB2+MR2 Add/drop:4.5dBMax

N pairs of

MB2+MR2

cascading

Add/drop:4.5+(N-1)*0.7dBMax N1,...7,8

Input (In)- output(Out) pass-through:1.5+(N-

1)*1.5dBMax

FIU 1dB

C OS


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OSNR limitation of OTU10 G without FEC:26dB10 G with FEC: 22dB

2.5G without FEC:22dB2.5G with FEC: 17dB

6 Calculate OSNR

Notes:

No gain flat unit in MetroWDM, so it need higher OSNR to ensure the

networking rationality with many amplifiers.


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Case of Metro 6100

Metropolitan Backbone Network


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58


A

Metro 6100

BMetro 6100

C

Metro 6100

Metro 6100

D

Network Topology & Service matrix Diagram

A B C D

A STM-64P4xSTM-16

FC(2G)(P)2xGE

B STM-64P STM-64 STM-64

C4xSTM-16

FC(2G)STM-64

STM-4, GE

STM-64

D 2xGE STM-64STM-4,GE

STM-64

25Km 25Km

60Km20Km


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E W E W E W E W E W

1 FC(2G)

2 4xSTM-16 GE,STM-4

3

4

5 STM-646 STM-647 2xGE

8 STM-64

9

10

32

AA B C D

Wavelength Allocation Diagram


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NODE A

7 dBNODE B

NODE C

Booster Amplifier Output +5 dBmVALUE Line Power loss

Legend:

Variable Optical Atenuator (+2dB)G.652 Fiber,

Fiber Loss of 0.275dB/km

MB2II

Booster Amplifier Output -1 dBm

West East

M/D32

NODE D

M/D32

MB2II

MR2MR2

MB2I

MB

2I

MR2

MR

2

7 dB

16.5 dB5.5 dB

BA06

BA06

BA06

BA06

BA02

BA02

BA06

BA06

MB2II MB2II

MR2MR2

MB2I MB2I

Network Configuration Diagram


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E W E W E W E W E W

1 FC(2G)

2 4xSTM-16 GE,STM-4

3

4

5 STM-646 STM-64

7 2xGE

8 STM-64

9

10

32

AA B C D

LWXLWXLWX

LGSOCU OCU

LWFLWF

LGS

LWFLWF

LWF LWF

LDGLDGLWFLWFLWF LWF

LWX

OTU Configuration Diagram


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HUB

M32

D32

SCC

SC2

M32

FIU

FIU

SC2

OCU

L

F

L

X E

L

D32

E

L

F

L

X

BA

06

BA

06

A

BA

06

BA

06

MB2

MR2

MR2

LWF

SCE

LWF

HUB

SCC

SC2

LWF

FIU

FIU

SC2

LWF

MB2

B

Rack Layout Diagram


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C D

Rack Layout Diagram

F

I

U

F

I

U

S

C

2

L

WX

L

WF

HUB

S

C

C

S

C

2

M

R

2

L

WX

B

A

0

2

M

B

2

I

M

B

2

I

L

GS

S

CE

O

CU

B

A

0

6

M

R

2

M

B

2

M

B

2

L

W

F

F

I

U

F

I

U

S

C

2

L

WF

L

WF

M

B

2

HUB

S

C

C

S

C

2

L

G

S

L

DG

M

B

2

M

R2

M

R2

S

CE

B

A

0

6

M

B

2

I

M

B

2

I

B

A

0

2


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optix wdm network design issue1.1

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