Specifications and types of DCM optical modules

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DCM optical modules are classified into multiple types, which correspond to compensation distances of 5 km, 10 km, 20 km, 40 km, 60 km, 80 km, 100 km, 120 km, 160 km, 200 km, and 240 km.

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Working principles of DCM optical modules
After an optical signal is transmitted over a certain distance, the optical signal pulse is widened because of the positive dispersion accumulated during line transmission, seriously affecting the system transmission performance. Using the passive compensation method, a DCM uses the negative dispersion of optical fibers to offset the positive dispersion of transmission fibers and therefore compresses signal pulses. According to different implementation principles, DCMs are classified into two types: DCMs using dispersion compensation fibers (DCFs) and DCMs using fiber Bragg grating (FBG).

How to view the type of an optical module
If the optical module has been inserted into an interface, you can run the display transceiver interface command to view the type of the optical module. display transceiver xgigabitethernet 2/0/0 XGigabitEthernet2/0/0 transceiver information: ------------------------------------------------------------- Common information: Transceiver Type :XFP-STM64-LX-SM1310 Connector Type :LC Wavelength(nm) :1310 Transfer Distance(m) :100000(9um) Digital Diagnostic Monitoring :YES Vendor Name :HUAWEI Vendor Part Number :02315208 Ordering Name : ------------------------------------------------------------- Manufacture information: Manu. Serial Number :210231520810E4000803 Manufacturing Date :2013-09-11 Vendor Name :HUAWEI ------------------------------------------------------------- Alarm information: RX loss of signal RX power low -------------------------------------------------------------

Position of the DCM module on an NE
If only one OBU board is configured on the NE, the DCM/DCU must be placed between a VOA and the OBU on the line. If only one OAU board is configured on the NE, the DCM/DCU must be placed between the TDC and RDC ports of the OAU board on the line. If OAU+OBU or OPU+OBU are configured on the NE, the DCM/DCU must be placed between the two OA boards.

Can I view the optical module types of switch and the receiving and transmitting power of the optical modules
You can use commands to view the information. To view the type of an optical module inserted into an optical interface, run the display interface interface-type interface-number command. To view the receiving and transmitting power on all interfaces, run the display transceiver diagnosis interface command. To view the receiving and transmitting power on an interface, run the display transceiver diagnosis interface interface-type interface-number command. For example: The display transceiver diagnosis interface GigabitEthernet 0/0/1 command displays the following information: Port GigabitEthernet0/0/1 transceiver diagnostic information: Parameter Current Low Alarm High Alarm Type Value Threshold Threshold Status ------------- --------- --------- ---------- -------- TxPower(dBm) -4.83 -11.02 -2.00 normal RxPower(dBm) NA -18.01 -1.00 NA Current(mA) 6.38 2.00 14.00 normal Temp.(C) 44.00 -20.00 90.00 normal Voltage(V) 3.31 2.90 3.70 normal

Method used to query the optical module type of a board
1. Query the board manufacturer information on the NMS. 2. View the barcode of the optical module onsite.

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