Huawei OptiX BWS 1600G. Technical Description - part 7
3 System Configuration
Power
from west
from east
to east
to west
O
O
F
T
S
F
O
O
A
A
I
C
C
I
A
A
U
U
U
2
C
U
U
U
(C)
(L)
(L)
(C)
west
east
DCM
Note: The "(L)" indicates the L band. The "(C)" indicates the C band.
Figure 3-12 Configuration of the C+L band OLA (type I and II systems)
If the system needs a Raman amplifier unit, configure two RPA boards in the new
middle subrack. If the system needs to configure the optical line protection,
configure two OLP boards in the new middle subrack. Note that RPA and OLP can
not be configured at the same time.
Type II System
The type II system supports C+L 800G and C 800G.
The C+L band OLA amplifies the signals on the main bidirectional path of C band
and L band. In each direction, two optical amplifiers are needed for amplifying
optical signals of C band and L band respectively. See Figure 3-12. The C band
OLA amplifies the optical signals on the main bidirectional path of C band. In each
direction, one optical amplifier is needed. See Figure 3-13.
Type III and V Systems
The OLA equipment achieves the bidirectional main path optical signal
amplification in C-band, and each direction needs one optical amplifier. The
configuration is shown in Figure 3-13.
3-18
3 System Configuration
Power
from west
from east
to east
to west
O
O
F
T
S
F
O
O
A
L
I
C
C
I
L
A
U
P
U
2
C
U
P
U
(C)
(C)
west
east
DCM
Note: The "(C)" indicates the C band.
Figure 3-13 Configuration of the C band OLA (type III and V systems)
The case shown in Figure 3-13 is configured with optical line protection, which can
be disabled by removing the OLP01 board. If the system needs a Raman amplifier
unit, configure two RPC boards in the lower subrack. Note that the Raman
amplification function and line protection function are exclusive.
Usually, the type V system does not need the DCM unit.
Type IV System
The configuration of the type IV system is similar to that of the type III system,
except that the OA units of the type IV system are used in L-band.
3.2.4 Configuration Principle
Configuration of Amplifier Unit
If the OAU, OBU and Raman amplifier unit are to be configured from west to
east, install them at the left side (slot 1 or 3) of the subrack. If they are to be
configured from east to west, install them at the right side (slot 12 or 10) of
the subrack.
If the power budget of the system is not adequate, the OBU can be used
besides OAU. Install the OBU in slot 3 (from west to east) or slot 10 (from
east to west).
3-19
3 System Configuration
The OBU is preferential than the Raman amplifier unit when installed in the
slots above mentioned. Raman amplifier units can also be installed in other
idle slots.
Configuration of SCC/SCE
Generally, the SCC is installed in the subrack with the SC1/SC2/TC1/TC2
installed. The SCE is installed on other subracks.
Configuration of Optical Supervisory Channel and Timing Transporting Unit
If clock transmission is required, use the TC2. Otherwise use the SC2. Note
that the TC2 cannot be used with SC2.
If clock protection is required, install the TC2 in both slot 6 and slot 8.
Otherwise slot 6 is preferred.
Configuration of Protection Group
The OLP01 is used for the purpose of optical line protection, but not used with the
Raman amplifier unit.
3.3 OADM
3.3.1 Signal Flow
The OADM is used to add/drop channels to/from the main path locally while
passing other channels transparently.
The OptiX BWS 1600G has three types of OADM equipment: serial OADM,
parallel OADM and re-configurable OADM (ROADM). Serial OADM can be
configured by concatenating MR2 boards, while parallel OADM is formed by
back-to-back OTMs. ROADM can be configured with DWC board. They are
applied to type I to type V systems. The type VI system is a long hop system with
no need for the OADM equipment.
Serial OADM
It consists of:
Optical add/drop multiplexer (OADM)
Optical transponder unit (OTU)
Optical amplifier (OA)
Raman pump amplifier unit (RPU)
Optical supervisory channel unit or supervisory channel and timing
transporting unit (OSC/OTC)
Fibre interface unit (FIU)
Dispersion compensation module (DCM)
Multi-channel spectrum analyser unit (MCA)
3-20
3 System Configuration
System control & communication unit (SCC)
Power backup unit (PBU)
Figure 3-14 shows the signal flow of the serial OADM.
O
O
O
T
T
T
U
U
U
1
2
n
OA
OA
C-band
F
OADM unit
F
C-band
I
OA
I
OA
U
U
L-band
OA
L-band
OA
OSC/OTC
MCA
Figure 3-14 Signal flow of the serial OADM
The OADM unit in Figure 3-14 is formed by the MR2, and can support full
add/drop at C-band.
At the receive end, the RPU (optional), a low-noise pump amplifier, amplifies line
optical signals. The FIU demultiplexes the line optical signals into service signals
and supervisory signal.
The supervisory signal is sent to the OSC or OTC for processing. The C-band
service signals are added/dropped some channels in the OADM. Note that the
service signals may need to be amplified before they enter or after they go out of the
OADM unit. The L-band service signals are also amplified through the OA. Finally,
C-band and L-band service signals are combined with supervisory signal and sent
to the optical fibre.
Parallel OADM
It consists of:
Optical transponder unit (OTU)
Optical multiplexer (OM)
Optical demultiplexer (OD)
Optical amplifier (OA)
Optical supervisory channel unit or supervisory channel and timing
transporting unit (OSC/OTC)
Fibre interface unit (FIU)
Dispersion compensation module (DCM)
3-21
3 System Configuration
Multi-channel spectrum analyser unit (MCA)
System control & communication unit (SCC)
Power backup unit (PBU)
Figure 3-15 shows the signal flow of the parallel OADM (the 40-channel system is
taken as an example)
OSC/OTC
λP
λP
λ1~40
λ 1~40
λP
OA
OD
OM
OA
λ
D
λA
IN
OUT
F
λD
λA
F
I
I
U
U
IN
OUT
λP
λP
λ 1~40
λP
λ 1~40
OA
OM
OD
OA
λA
λD
λA
λD
O
O
O
O
T
T
T
T
U
U
U
U
MCA
λP: Pass-through channel
λA: Added channel
λD: Dropped channel
Figure 3-15 Signal flow of the parallel OADM
The parallel OADM is formed by back-to-back OTMs. The parallel OADM can
add/drop channels through the OD (D40) and the OM (M40) while regenerating or
passing through other channels.
When more than 32 add/drop channels are required in one station, the parallel
OADM is usually used. In addition, it can be upgraded to 160 channels as needed.
ROADM
The ROADM consists of functional units as follows:
Optical add/drop multiplexer (OADM)
Optical transponder unit (OTU)
Optical multiplexer (OM)
Optical demultiplexer (OD)
Optical amplifier (OA)
Optical supervisory channel (OSC)
Fiber interface unit (FIU)
Dispersion compensation module (DCM)
3-22
3 System Configuration
Multi-channel spectrum analyzer unit (MCA)
System control and communication unit (SCC)
OTU power backup unit (PBU)
Figure 3-16 shows the signal flow of the ROADM. (40-channel system for
example)
OSC
1
2
λP
λP
λA
λ 1~40
λ 1~40
OA
OA
E
E
IN
OUT
F
F
I
DWC
DWC
I
U
U
IN
OUT
λ
λ 1~40
W
P
W
λ 1~40
OA
OA
λA λP
OM
OM
MCA
OD
OD
O
O
O
O
T
T
T
T
U
U
U
U
W westward
O
O
O
O
λA
λA
T
T
λA
λA
T
T
E eastward
U
U
U
U
W
E
λD
λD
λD
λD
E
W
Figure 3-16 Signal flow of the ROADM
The ROADM adds and drops any channel of the C-band in both directions by two
cascaded DWCs.
From west to east, the No.1 DWC divides the signals into two same groups of
multi-wave signals. One is to pass through and another is to be dropped.
The optical demultiplexer (OD) connect with No.1 DWC demultiplexes signals to
be dropped into single channels.
Channels to pass through enter the No.1 DWC. Then channels to be dropped are
blocked. Those to pass through directly pass through.
Channels to be added are multiplex by the optical multiplexer (OM) of fixed
wavelength (connect with No.2 DWC). Then the signals enter the No.2 DWC and
are multiplexed with the passing through multi-wave signals. Finally, the
multiplexed signals enter the amplifier and reach the line end.
Signals from east to west are the same.
3-23
3 System Configuration
3.3.2 Structure
The parallel OADMs and ROADM of the five system types (type I to type V) are
constructed in the similar way. Here only serial OADM is introduced.
For the serial OADM of the five system types, each functional unit and the board(s)
contained are shown in Table 3-4.
For the functions of these boards, see Chapter 2 "Product Description".
Table 3-4 Functional units and the boards contained (five system types)
Unit
OTU
OADM
OA
OSC/OTC
FIU
System
I
LWF, TMX, LBE,
ITL+MR2
OAU,
SC2, TC2
FIU-01,
LOG
OBU, OPU
FIU-02
II (C+L
LWF, TMX, LBE,
MR2
OAU,
SC2, TC2
FIU-01,
800G)
LOG
OBU, OPU
FIU-02
II (C 800G)
All OTUs
ITL+MR2
OAU,
SC2, TC2
FIU-03
OBU, OPU
III
All OTUs
MR2
OAU,
SC2, TC2
FIU-03
OBU,
OPU,
IV
LWF, TMX, LBE,
MR2
OAU,
SC2, TC2
FIU-05
LOG
OBU, OPU
V
LWC1, LDG,
MR2
OAU,
SC2, TC2
FIU-03
FDG, LWM,
OBU, OPU
LWX
Type I System
The structure of the serial OADM of the type I system is shown in Figure 3-17 .
3-24
3 System Configuration
OADM unit
λ1
λ2
λn
C-ODD
OADM
OADM
board
board
C-ODD
I
I
T
T
L
C-EVEN
L
OADM
OADM
board
board
C-EVEN
λ1
λ2
λn
Figure 3-17 Structure of the OADM in type I system
In Figure 3-17, the OADM includes the ITL, which divides the service signals into
odd channels and even channels. Up to 16 odd channels and 16 even channels can
be added/dropped in C band, so the OADM can add/drop up to 32 channels locally.
Type II System
The type II system supports C+L 800G and C 800G.
The C+L OADM does not include ITL. It supports full add/drop by cascading
OADM units. The OADM of C band is the same as that of the type I system. It can
add/drop up to 32 channels.
λ1
λ2
λn
λ1
λ2
λn
C-EVEN
C-ODD
OADM
OADM
OADM
OADM
C-EVEN
C-ODD
I
I
T
T
L-ODD
L
C-EVEN
L
OADM
OADM
OADM
OADM
L-ODD
C-EVEN
λ1
λ2
λn
λ1
λ2
λn
Type II system
Tpe II system
C+L 800G
C 800G
Figure 3-18 Structure of the OADM in type II system
Type III, IV and V Systems
The OADM of the type III system does not include the ITL. It can support full
add/drop by cascading OADMs. See Figure 3-19.
3-25
3 System Configuration
OADM in type III system
λ1
λ2
λn
C-EVEN
OADM
OADM
board
board
C-EVEN
Figure 3-19 Structure of the OADM in type III system
The OADM of the type IV and V systems does not include the ITL either. They
add/drop up to 16 channels by cascading MR2 boards.
3.3.3 Typical Configuration
Serial OADM
Taking the type III system as an example, 16 channel services can be
added/dropped at OADM (eight in east and eight in west), and other wavelengths
pass through. The configuration is shown in Figure 3-20.
Power
M
M
O
O
O
O
S
M
M
O
O
O
O
west
R
R
T
T
T
T
C
R
R
T
T
T
T
2
2
U
U
U
U
E
2
2
U
U
U
U
subrack
M
M
O
O
O
O
S
M
M
O
O
O
O
R
R
T
T
T
T
C
R
R
T
T
T
T
east
2
2
U
U
U
U
E
2
2
U
U
U
U
subrack
from west
from east
to east
to west
O
O
F
T
S
F
O
O
A
B
I
C
C
I
B
A
U
U
U
2
C
U
U
U
(C)
(C)
(C)
(C)
west
east
DCM
HUB
Note: The "(C)" indicates the C band.
Figure 3-20 Configuration of the C-band serial OADM equipment (type III system)
3-26
3 System Configuration
If the system needs the Raman amplifier unit, the RPU is installed in the new
subrack. If the system needs the optical line protection, two OLP boards are
installed in the new subrack and cabinet.
If OTUs need centralised power protection, a PBU board must be configured in slot
1 of each subrack holding OTUs. And all OTU boards are placed from left to right
after the PBU.
The configurations of OADM of other systems are similar to that of the type III
system. For the type I system, the ITL board and L-band OAU must be added.
For the type II system, the L-band OAU must be added for C+L 800G and the ITL
board added for C 800G.
For the type IV system, the L-band OAU and OADM unit must be added.
For the type V system, the DCM is not needed.
Parallel OADM
Take the type III system as an example. 20 channels of services can be
added/dropped at OADM (10 in east and 10 in west), and other wavelengths pass
through. The configuration is shown in Figure 3-21.
Power
Power
P
O
O
S
V
P
O
O
S
V
B
T
T
C
A
B
T
T
C
A
U
U
U
E
4
U
U
U
E
4
P
O
O
O
O
O
S
O
O
O
V
V
P
O
O
O
O
O
S
O
O
O
V
V
B
T
T
T
T
T
C
T
T
T
A
A
B
T
T
T
T
T
C
T
T
T
A
A
U
U
U
U
U
U
E
U
U
U
4
4
U
U
U
U
U
U
E
U
U
U
4
4
M
O
F
T
S
M
O
D
M
O
F
T
S
O
D
4
A
I
C
C
C
A
4
4
A
I
C
C
A
4
0
U
U
2
C
A
U
0
0
U
U
2
C
U
0
(C)
(C)
(C)
(C)
DCM
DCM
HUB/1
HUB/1
East cabinet
West cabinet
Note: The "(C)" indicates the C band.
Figure 3-21 Configuration of the C-band parallel OADM equipment (type III system)
3-27
3 System Configuration
3.3.4 Configuration Principle
Configuration of Amplifier Unit
C or L below the OAU, OBU, MCA, and ITL indicates their working bands.
If the OAU is to be used with the Raman amplifier unit, install the
OAU-CR/OAU-LR. Otherwise, use the OAU-CG/OAU-LG. and the
SSE3OAU C-series OAUs.
If the OAU, OBU, Raman amplifier unit and ITL are to be configured from
west to east, install them at the left side of the subrack. If they are to be
configured from east to west, install them at the right side of the subrack.
Configuration of OTU
When installing the OTU, first configure the C-EVEN module, and then
C-ODD module.
If the number of MR2 boards exceeds 4, east MR2 boards are installed in one
subrack and west MR2 boards in another. If the number is no more than 4,
east MR2 boards are installed in right slots and west MR2 boards in left slots
of the same subrack.
Configuration of SCC/SCE
Generally, the SCC board is required on the subrack with the SC1, SC2, TC1
or TC2 installed. The SCE is installed on other subracks.
Configuration of Optical Supervisory Channel and Timing Transporting Unit
If clock transmission is required, use the TC2. Otherwise use the SC2. Note
that the TC2 cannot be used with the SC2.
If clock protection is required, install the TC2 in both slot 6 and slot 8.
Otherwise slot 6 is preferred.
Configuration of Protection Group
The OLP01 is used for the purpose of optical line protection. It is exclusive with the
Raman amplifier unit in the configuration.
3-28