OSN 8800 is a new-generation optical transmission system developed by Huawei. It adopts a unified switching architecture and can function as an MPLS/MPLS-TP-based packet device or a TDM device. When working with other devices of Huawei, OSN 8800 supports various networking modes, including the pure packet mode, hybrid networking (packet + TDM) mode, and pure TDM mode, achieving optimal processing for packet services and traditional SDH services. Thus, OSN 8800 efficiently transmits voice and data services over the same platform.
The available functional version of the BMD4 board is TN11.
Mappings Between the Board and Equipment
The following provides the board(s) supported by the product. However, the availability of the board(s) is subject to PCNs. For PCN information, contact the product manager at your local Huawei office.
|Board||General 8800 T64 Subrack||Enhanced 8800 T64 Subrack||General 8800 T32 Subrack||Enhanced 8800 T32 Subrack||8800 T16 Subrack||8800 Universal Platform Subrack||6800 Subrack||3800 Chassis|
The BMD4 is an optical multiplexer and demultiplexer unit. It multiplexes and demultiplexes signals.
Functions and Features
The BMD4 provides functions and features such as multiplexing, demultiplexing, and in-service spectrum detection.
|Function or Feature||Description|
|Basic function||In a 40-channel system, the BMD4 board multiplexes and demultiplexes the optical signals.Demultiplexes one channel of input 40-wavelength multiplexed signals with a spacing of 100 GHz to four channels of signals with a spacing of 200 GHz, that is, two channels of 12-wavelength multiplexed signals and two channels of 8-wavelength multiplexed signals. The reverse process is similar.|
|In-service detection and monitoring of the spectrum||Provides an in-service monitoring interface. A small number of optical signals can be output to the spectrum analyzer or spectrum analyzer unit through the interface to monitor the spectrum and optical performance of the multichannel signals without interrupting the services.|
|Optical-layer ASON||Not supported|
Working Principle and Signal Flow
The BMD4 board consists of the optical module, the control and communication module, and the power supply module.
Figure 1 shows the functional modules and signal flow of the BMD4.
The multiplexed signals with a spacing of 100 GHz are accessed through the IN optical interface and transmitted to the interleaver. Then, the interleaver splits the multiplexed signals into four channels of multiplexed signals with a spacing of 200 GHz, that is, two channels of 12-wavelength multiplexed signals and two channels of 8-wavelength multiplexed signals. Finally, the four channels of multiplexed signals are output through the T01-T04 optical interfaces.
The four channels of multiplexed signals are received through the R01-R04 optical interfaces and are transmitted to the coupler. Then, the coupler couples the four channels of multiplexed signals into one channel of multiplexed signals with a spacing of 100 GHz. Finally, the signals are output through the OUT optical interface.
- Optical module
- Demultiplexes one channel of input 40-wavelength multiplexed signals with a spacing of 100 GHz into four channels of multiplexed signals with a spacing of 200 GHz, that is, two channels of 12-wavelength multiplexed signals and two channels of 8-wavelength multiplexed signals, and uses the coupler to couple the signals with a spacing of 200 GHz into one channel of 40-wavelength multiplexed signals with a spacing of 100 GHz.
- The splitter splits some optical signals from the main optical path and provides them to the MON interface for detection.
- Control and communication module
- Controls board operations.
- Controls the operations on each module of the board according to the instructions from the CPU.
- Collects information about alarms, performance events, working status, and voltage detection of each functional module of the board.
- Communicates with the SCC board.
- Power supply moduleConverts the DC power supplied by the backplane into the power required by each module on the board.
There is one indicator and laser level label on the front panel of the BMD4.
Appearance of the Front Panel
Figure 1 shows the front panel of the BMD4.
One indicator is present on the front panel:
- Board hardware status indicator (STAT) - green
For details about this indicator, see Board Indicators.
Table 1 lists the type and function of each interface.
|IN||LC||Accesses the optical signals at 100 GHz channel spacing (C_EVEN multiplexed signals).|
|OUT||LC||Outputs the optical signals at 100 GHz channel spacing (C_EVEN multiplexed signals).|
|MON||LC||Connects to the input port on the MCA4 or the MCA8 board, for in-service monitoring of the signals routed to the OUT port.
The ratio of the MON port power to the OUT port power is 10:90, that is, the optical power at the MON interface is 10 dB lower than the optical power at the OUT interface, calculation formula: Pout(dBm) - Pmon(dBm) = 10 x lg(90/10) = 10 dB.
|T01/R01||LC||Transmits/Receives 12 wavelengths (193.80 THz to 196.00 THz) of optical signals with a 200 GHz channel spacing.|
|T02/R02||LC||Transmits/Receives 12 wavelengths (193.70 THz to 195.90 THz) of optical signals with a 200 GHz channel spacing.|
|T03/R03||LC||Transmits/Receives eight wavelengths (192.20 THz to 193.60 THz) of optical signals with a 200 GHz channel spacing.|
|T04/R04||LC||Transmits/Receives eight wavelengths (192.10 THz to 193.50 THz) of optical signals with a 200 GHz channel spacing.|
Laser Hazard Level
The laser hazard level of the board is HAZARD LEVEL 1M, indicating that the maximum power launched by the board ranges from 10 dBm (10 mW) to 21.3 dBm (136 mW).
Characteristic Code of the BMD4
The characteristic code of the BMD4 consists of one character, indicating the band adopted by the board.
Table 1 provides the details about the characteristic code of the BMD4.
|The first character||Band||Indicates the multiplexing scheme adopted by the board. The value C represents the C band. The value L represents the L band.|
For example, if the characteristic code of the BMD4 is C, it indicates that the optical signals are in the C band.
The specifications include the optical specifications, dimensions, weight, and power consumption.
|Operating wavelength range||nm||1529 - 1561|
|T0x/R0x channel spacinga||GHz||200|
|IN/OUT channel spacing||GHz||100|
|Optical return loss||dB||>= 40|
|Polarization dependent loss||dB||<= 0.5|
|Input optical power range||dBm||<= 23|
|a: T0x represents T01 to T04 ports. R0x represents R01 to R04 ports.b: In the case of T01/T03@T02/T04, this parameter refers to the isolation between any one of T01/T03 ports and any one of T02/T04 ports. It is the same case for other isolation item. T01/T02 ports are intended for blue band signals. T03/T04 ports are intended for red band signals.|
- Dimensions of front panel (H x W x D): 264.6 mm (10.4 in.) x 25.4 mm (1.0 in.) x 220 mm (8.7 in.)
- Weight: 1.2 kg (2.7 lb.)
|Board||Typical Power Consumption (W)||Maximum Power Consumptiona (W)|
|a: The maximum power consumption is the power consumed by the board when it works normally under the highest ambient temperature.|
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