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Optical Network Curriculum
Development Section
ISSUE
TC000603
OptiX WDM Network Design
1.1
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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
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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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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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OptiX Series Product
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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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Node type design
Protection design
DWDM wavelength allocation design
Interface type design
Section 2 Key Points of National backbone design
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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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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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Node type design
Protection design
DWDM wavelength allocation design
Interface type design
Key Points of National backbone design
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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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Node type design
Protection design
DWDM wavelength allocation design
Interface type design
Key Points of National backbone design
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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
DWDM wavelength allocation design
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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
DWDM wavelength allocation design
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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
DWDM wavelength allocation design
F
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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
DWDM wavelength allocation design
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Node type design
Protection design
DWDM wavelength allocation design
Interface type design
Key Points of National backbone design
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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.
Interface type design
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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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OptiX Metro6100
Network DesignB
OptiX BWS 1600GNetwork Design
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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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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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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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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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Design Rule of 400G System 2: Amplifier
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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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
Design Rule of 400G System 2: Amplifier
The inserting loss
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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
Design Rule of 400G System 2: Amplifier
Power Budget
f G S f
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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
Design Rule of 400G System 2: Amplifier
Power Budget
MR2
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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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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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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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HAM GHA KA TEH
359km 110km 55km
BAB SEM
243km190km
Exercise: Network topology diagram
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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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OptiX Metro6100
Network Design
OptiX BWS 1600GNetwork Design
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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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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;
2WBA06Input power -21dBm~ -3dBm,Gain 17dB;
3WBA02Input power -20dBm~ -3dBm,Gain 23dB;
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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Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
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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Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Case of Metro 6100
Metropolitan Backbone Network
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Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
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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Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
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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Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
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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Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
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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Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
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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Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
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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