HUAWEI OptiX OSN 8800 T64/T32 Intelligent Optical Transport Platform. Product Description - part 22
Figure 6-25 Schematic diagram of ROADM node with WSMD2 boards
SC2
West
East
line-side
FIU
FIU
line-side
OA
OA
ODF
ODF
WSMD2
WSMD2
OA
OA
OD
OM
OM
OD
O
O
O
O
O
O
O
O
T
T
T
T
T
T
T
T
U
U
U
U
U
U
U
U
West client-side
East client-side
FIU: fiber interface unit OA: optical amplifier unit
SC2: bidirectional OSC unit
OD: optical demultiplexer OTU: optical transponder unit WSMD2: 2-port wavelength selective switching
multiplexing and demultiplexing board
OM: optical multiplexer ODF: Optical distribution frame
Typical Configuration
The OptiX OSN 8800 is available in two types of subracks, that is, the OptiX OSN 8800 T32
subrack and the OptiX OSN 8800 T64 subrack. The OptiX OSN 8800 T32 subrack is considered
as an example to describe the typical configuration. For the differences between the OptiX OSN
8800 T32 subrack and the OptiX OSN 8800 T64 subrack, see the Hardware Description.
The two-dimensional ROADM equipment (40 wavelengths at the optical layer and 32
wavelengths at the electrical layer), which can add/drop 30% services and is formed by the
WSMD2, is taken for example. Figure 6-26 shows the typical configuration. One cabinet and
two subracks are used.
224
Figure 6-26 Typical configuration of the ROADM equipment that consists of the WSMD2
boards (40-channel)
FAN
A
S
S
EF
U
T
T
EFI2
PIU
PIU
PIU
PIU
STI
ATE
I1
X
G
G
N
N
N
N
N
N
N
N
S
N
N
N
N
N
N
N
N
Q
Q
Q
Q
Q
Q
Q
Q
C
Q
Q
Q
Q
Q
Q
Q
Q
2
2
2
2
2
2
2
2
C
2
2
2
2
2
2
2
2
X
X
C
C
H
H
/
/
X
X
C
C
M
M
T
T
T
T
T
T
T
T
S
Q
Q
Q
Q
O
O
O
O
C
X
X
X
X
M
M
M
M
C
FAN
FAN
A
S
S
EF
U
T
T
EFI2
PIU
PIU
PIU
PIU
STI
ATE
I1
X
G
G
S
S
M40V
D40
C
C
D40
M40V
C
2
O
W
W
O
O
O
F
B
S
S
S
B
F
A
A
I
U
M
C
M
U
I
U
U
U
D
C
D
U
1
1
1
2
2
1
FAN
225
6.4.9 ROADM Node with WSMD4 Boards
Functions
The reconfigurable optical add or drop multiplexer (ROADM) with WSMD4 boards can add
and drop channels dynamically within a ring network. It supports up to four-dimensional
grooming and extension between ring networks.
WSMD4 board achieves the dynamic and configurable multiplexing and demultiplexing of any
wavelengths to any ports. A node on the ring or chain network can receive any wavelengths at
the local station through any ports. It also can transmit any wavelength combination to any ports,
so as to achieve the dynamic allocation of wavelengths. The ROADM node uses two WSMD4s
to add or drop any service in any even-numbered wavelength and odd-wavelength channel of
the two directions in the C band.
The ROADM formed by the WSMD4 boards can be adopted in center sites or edge sites. It has
the following advantages:
l Flexible expansion without service interruption
l Low operation cost
l Adjustment of wavelength adding/dropping and passing through status by NM software to
realize remote dynamic adjustment of wavelength status
Functional Units
An ROADM system, which consists of WSMD4 boards, has the following units:
l Optical transponder unit (OTU)
l Optical amplifier unit (OA)
l Bidirectional optical supervisory channel unit (SC2)
l Fiber interface unit (FIU)
l Interleaver unit (ITL)
l OADM or optical multiplexer and demultiplexer (OADM/OM/OD)
l
4-port wavelength selective switching multiplexing and demultiplexing board (WSMD4)
l System control and communication unit (SCC)
For the boards used in each unit, see 4.2 Hardware Architecture.
Signal Flow
An ROADM node consists of four WSMD4s. The signal grooming from west to east, south, and
north is taken for example. The signal grooming from east, south, and north to the other three
of the four directions is the same as that from west to east, south and north.
Initially, the optical supervisory signals and the main path optical signals are separated from the
line signals received from west. The optical supervisory signals are sent to the optical supervisory
unit for processing, and the main-path optical signals are sent to the WSMD4 board after being
amplified.
226
The WSMD4 board splits the main path optical signals into four equal optical signals. The optical
demultiplexing unit demultiplexes the main path signals into single wavelengths that need be
output from the local station.
If the service signals need be output eastward, the signals from west WSMD4 board are input
through the east WSMD4 board. The added wavelengths that need be output eastward are added
through an input port on the east WSMD4 board. The added wavelengths are multiplexed with
the wavelengths groomed from west. The multiplexed wavelengths are amplified and are further
multiplexed with the processed optical supervisory signals for line transmission.
The signal flow of the services to be output southward or northward is the same as that eastward.
The ITL board is optional in an ROADM system, which consists of WSMD4 boards.
l If the ITL board is configured, the wavelengths that need to be dropped locally are output
to the ITL board through an interface on the WSMD4 board. The ITL board splits the
multiplexed signals into two groups: odd-numbered wavelength signals and even-
numbered wavelength signals. These two groups of signals are output to the OD (C-ODD)
and OD (C-EVEN) boards respectively.
l If the ITL board is not configured, the odd and even-numbered wavelengths that need to
be output locally are output to the OD (C-ODD) and OD (C-EVEN) boards respectively
through two interfaces on the WSMD4 board.
Figure 6-27 shows the functional modules of this type of ROADM.
Figure 6-27 Schematic diagram of ROADM node with WSMD4 boards
West client-side
East client-side
F
F
West
East
I
I
line-side
WSMD4
WSMD4
line-side
U
U
ODF
ODF
F
F
South
WSMD4
WSMD4
North
I
I
line-side
line-side
ODF
U
U
ODF
South client-side
North client-side
FIU: fiber interface unit WSMD4: 4-port wavelength selective switching
ODF: Optical distribution frame
multiplexing and demultiplexing board
227
Typical Configuration
The four-dimensional ROADM equipment (40-channel), which can add/drop 30% services and
is formed by four WSMD4, is taken for example. Figure 6-28 shows the typical configuration.
Two cabinets and three subracks are used.
Figure 6-28 Typical configuration of the ROADM equipment that consists of the WSMD4
boards (40-channel)
FAN
FAN
A
S
S
A
S
S
EF
U
T
T
EF
U
T
T
EFI2
PIU
PIU
PIU
PIU
STI
ATE
EFI2
PIU
PIU
PIU
PIU
STI
ATE
I1
X
G
G
I1
X
G
G
N
N
N
N
N
N
N
N
S
N
N
N
N
N
N
N
N
O
O
O
O
F
S
S
F
Q
Q
Q
Q
Q
Q
Q
Q
C
Q
Q
Q
Q
Q
Q
Q
Q
I
A
B
C
C
B
A
I
2
2
2
2
2
2
2
2
C
2
2
2
2
2
2
2
2
U
U
U
2
C
U
U
U
1
1
1
1
X
X
C
C
H
H
O
O
O
O
N
N
N
N
T
T
T
T
S
T
T
T
T
F
S
S
F
A
B
B
A
Q
Q
Q
Q
Q
Q
Q
Q
C
O
O
O
O
I
C
C
I
U
U
U
U
2
2
2
2
X
X
x
X
C
M
M
M
M
U
2
C
U
1
1
1
1
FAN
FAN
FAN
A
S
S
EF
U
T
T
EFI2
PIU
PIU
PIU
PIU
STI
ATE
I1
X
G
G
W
W
S
S
S
M40V
D40
M
C
M
D40
M40V
D
C
D
4
4
W
W
S
S
S
M40V
D40
M
C
M
D40
M40V
D
C
D
4
4
FAN
The four-dimensional ROADM equipment (80-channel), which can add/drop 30% services and
is formed by four WSMD4, is taken for example. Figure 6-29 shows the typical configuration.
Two cabinets and four subracks are used.
228
Figure 6-29 Typical configuration of the ROADM equipment that consists of the WSMD4
boards (80-channel)
FAN
FAN
A
S
S
A
S
S
EF
U
T
T
EF
U
T
T
EFI2
PIU
PIU
PIU
PIU
STI
ATE
EFI2
PIU
PIU
PIU
PIU
STI
ATE
I1
X
G
G
I1
X
G
G
N
N
N
N
N
N
N
N
S
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
S
N
N
N
N
N
N
N
N
Q
Q
Q
Q
Q
Q
Q
Q
C
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
C
Q
Q
Q
Q
Q
Q
Q
Q
2
2
2
2
2
2
2
2
C
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
C
2
2
2
2
2
2
2
2
X
X
X
X
C
C
C
C
H
H
H
H
N
N
N
N
T
T
T
T
S
T
T
T
T
N
N
N
N
T
T
T
T
S
T
T
T
T
Q
Q
Q
Q
Q
Q
Q
Q
C
O
O
O
O
Q
Q
Q
Q
Q
Q
Q
Q
C
O
O
O
O
2
2
2
2
X
X
x
X
C
M
M
M
M
2
2
2
2
X
X
x
X
C
M
M
M
M
FAN
FAN
FAN
FAN
A
S
S
EF
U
T
T
A
S
S
EFI2
PIU
PIU
PIU
PIU
STI
ATE
EF
U
T
T
I1
X
G
G
EFI2
PIU
PIU
PIU
PIU
STI
ATE
I1
X
G
G
I
S
I
W
W
O
O
S
O
O
M40V
D40
T
C
T
D40
M40V
F
A
B
S
S
S
B
A
F
I
C
M
C
M
I
L
C
L
U
U
U
U
U
2
D
C
D
U
1
1
1
1
4
4
I
I
W
W
S
O
O
O
O
T
F
S
S
S
S
F
M40V
D40
T
C
D40
M40V
A
B
B
A
L
C
L
I
C
M
C
M
I
U
U
U
U
U
2
D
C
D
U
1
1
1
1
4
4
FAN
FAN
6.4.10 ROADM Node with WSMD9 Boards
Functions
The reconfigurable optical add or drop multiplexer (ROADM) with WSMD9 boards can add
and drop channels dynamically within a ring network. It supports up to nine-dimensional
grooming and extension between ring networks.
WSMD9 board achieves the dynamic and configurable multiplexing and demultiplexing of any
wavelengths to any ports. A node on the ring or chain network can receive any wavelengths at
the local station through any ports. It also can transmit any wavelength combination to any ports,
so as to achieve the dynamic allocation of wavelengths. The ROADM node uses two WSMD9s
229
to add or drop any service in any even-numbered wavelength and odd-wavelength channel of
the two directions in the C band.
The ROADM formed by the WSMD9 boards can be adopted in center sites or edge sites. It has
the following advantages:
l Flexible expansion without service interruption
l Low operation cost
l Adjustment of wavelength adding/dropping and passing through status by NM software to
realize remote dynamic adjustment of wavelength status
Functional Units
An ROADM system, which consists of WSMD9 boards, has the following units:
l Optical transponder unit (OTU)
l Optical amplifier unit (OA)
l Bidirectional optical supervisory channel unit (SC2)
l Fiber interface unit (FIU)
l Interleaver unit (ITL)
l OADM or optical multiplexer and demultiplexer (OADM/OM/OD)
l
9-port wavelength selective switching multiplexing and demultiplexing board (WSMD9)
l System control and communication unit (SCC)
For the boards used in each unit, see 4.2 Hardware Architecture.
Signal Flow
An ROADM node consists of four WSMD9s. The signal grooming from west to east, south, and
north is taken for example. The signal grooming from east, south, and north to the other three
of the nine directions is the same as that from west to east, south and north.
Initially, the optical supervisory signals and the main path optical signals are separated from the
line signals received from west. The optical supervisory signals are sent to the optical supervisory
unit for processing, and the main-path optical signals are sent to the WSMD9 board after being
amplified.
The WSMD9 board splits the main path optical signals into nine equal optical signals. The optical
demultiplexing unit demultiplexes the main path signals into single wavelengths that need be
output from the local station.
If the service signals need be output eastward, the signals from west WSMD9 board are input
through the east WSMD9 board. The added wavelengths that need be output eastward are added
through an input port on the east WSMD9 board. The added wavelengths are multiplexed with
the wavelengths groomed from west. The multiplexed wavelengths are amplified and are further
multiplexed with the processed optical supervisory signals for line transmission.
The signal flow of the services to be output southward or northward is the same as that eastward.
The ITL board is optional in an ROADM system, which consists of WSMD9 boards.
l If the ITL board is configured, the wavelengths that need to be dropped locally are output
to the ITL board through an interface on the WSMD9 board. The ITL board splits the
multiplexed signals into two groups: odd-numbered wavelength signals and even-
230
numbered wavelength signals. These two groups of signals are output to the OD (C-ODD)
and OD (C-EVEN) boards respectively.
l If the ITL board is not configured, the odd and even-numbered wavelengths that need to
be output locally are output to the OD (C-ODD) and OD (C-EVEN) boards respectively
through two interfaces on the WSMD9 board.
Figure 6-30 shows the functional modules of this type of ROADM.
Figure 6-30 Schematic diagram of ROADM node with WSMD9 boards
West
Eest
client-side
client-side
D
D
West
A
Eest
A
line-side
S
line-side
WSMD9
WSMD9
S
ODF
ODF
1
1
D
D
South
A
WSMD9
WSMD9
North
line-side
S
A
line-side
ODF
1
S
ODF
1
South
North
client-side
client-side
DAS1: Double optical amplifier unit
WSMD9: 9-port wavelength selective
ODF: Optical distribution frame
with supervisory channel
switching multiplexing and
demultiplexing board
Typical Configuration
The nine-dimensional ROADM equipment (80-channel), which can add/drop services and is
formed by four WSMD9, is taken for example. Figure 6-31 shows the typical configuration.
Two cabinets and four subracks are used.
231
Figure 6-31 Typical configuration of the ROADM equipment that consists of the WSMD9
boards (80-channel)
FAN
FAN
E
A
S
S
E
A
S
S
EFI
U
T
T
ST
AT
EFI
U
T
T
ST
AT
F
PIU
PIU
PIU
PIU
F
PIU
PIU
PIU
PIU
2
X
G
G
I
E
2
X
G
G
I
E
I1
I1
N
N
N
N
N
N
N
N
S
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
S
N
N
N
N
N
N
N
N
Q
Q
Q
Q
Q
Q
Q
Q
C
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
C
Q
Q
Q
Q
Q
Q
Q
Q
2
2
2
2
2
2
2
2
C
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
C
2
2
2
2
2
2
2
2
X
X
X
X
C
C
C
C
H
H
H
H
N
N
N
N
T
T
T
T
S
T
T
T
T
N
N
N
N
T
T
T
T
S
T
T
T
T
Q
Q
Q
Q
Q
Q
Q
Q
C
O
O
O
O
Q
Q
Q
Q
Q
Q
Q
Q
C
O
O
O
O
2
2
2
2
X
X
X
X
C
M
M
M
M
2
2
2
2
X
X
X
X
C
M
M
M
M
FAN
FAN
FAN
FAN
E
A
S
S
E
A
S
S
EFI
U
T
T
ST
AT
EFI
U
T
T
ST
AT
F
PIU
PIU
PIU
PIU
PIU
PIU
PIU
PIU
2
X
G
G
I
E
2
F
X
G
G
I
E
I1
I1
W
W
D
D
S
S
I
S
I
A
S
A
M
M
M40V
D40
T
C
T
D40
M40V
S
C
S
D
D
L
C
L
1
C
1
9
9
W
W
D
D
I
S
I
S
S
S
A
A
M40V
D40
T
C
T
D40
M40V
M
C
M
S
S
L
C
L
D
C
D
1
1
9
9
FAN
FAN
232
6.5 REG in a DWDM System
The REG equipment is an electrical regenerator and is used to further extend the optical
transmission distance.
Functions
We have already discussed that the OLA can extend the optical transmission distance without
regeneration. However, when the distance is longer, such factors as dispersion, optical noise,
non-linear effect, or PMD will affect the transmission performance. In this case, we need to
regenerate the original signals. An REG implements the 3R function: reshaping, retiming and
regenerating. This is to improve the signal quality and to extend the transmission distance.
Functional Units
An REG station contains:
l Optical transponder unit (OTU) or line unit
l Optical multiplexer (OM)
l Optical demultiplexer (OD)
l Optical amplifier (OA)
l Optical supervisory channel unit (OSC)
l Fiber interface unit (FIU)
l Multi-channel spectrum analyzer unit (MCA)
l System control & communication unit (SCC)
For the boards used in each unit, see 4.2 Hardware Architecture.
Signal Flow
The signal flow of the REG is similar to that of back-to-back OTMs, except that no signal is
added or dropped. Signals are regenerated through the OTU or line unit.
The REG node is responsible for processing the optical signals in two transmission directions.
It separates the optical supervisory signals and the main path optical signals from the received
line signals. The optical supervisory signals are sent to the OSC unit for processing. The main
path signals are sent to the demultiplexer after being amplified. The demultiplexed signals enter
the OTU or line unit and are reshaped, re-timed, and regenerated. Then the wavelengths are
multiplexed by the multiplexer before the optical amplification. Finally, the signals are
multiplexed with the processed optical supervisory signals for line transmission.
Figure 6-32 and Figure 6-33 show the block diagram of the REG signal flow.
233
Figure 6-32 REG signal flow (OTU as regeneration unit)
λ01
DCM
OTU
DCM
λ02
OTU
OA
OM
OD
OA
λn
OTU
F
F
I
SC2
I
U
U
λ01
OTU
MCA
λ02
OTU
OA
OD
OM
OA
λn
DCM
OTU
DCM
OTU: OTU with regenertion function(LSXLR or LSXR)
λ01
DCM
OTU
OTU
DCM
λ02
OTU
OTU
OA
OM
OD
OA
λn
OTU
OTU
F
F
I
SC2
I
U
U
λ01
OTU
OTU
MCA
λ02
OTU
OTU
OA
OD
OM
OA
λn
DCM
OTU
OTU
DCM
OTU: OTU without regeneration function(LOM, TMX tec.)
OTU: optical transponder unit
OM: optical multiplex unit
SC2: bidirectional OSC unit
OD: optical demultiplex unit
FIU: fiber interface unit
OA: optical amplifier unit
ODF: Optical distribution frame MCA: spectrum analyzer unit DCM: dispersion compensation module
234