The TWC board is applied on DWDM optical terminals and optical regeneration devices, and is located at the transmit end. The RWC board is applied on DWDM optical terminals and optical regeneration devices, and is located at the receive end.
The functions of the TWC and RWC boards on BWS 320G devices are as follows:
1. The TWC board converts optical signals transmitted from SDH devices into wavelengths required by the WDM system through O/E and E/O conversions. Different TWC boards convert optical signals of different wavelengths.
2. The RWC board transmits optical signals to SDH devices. It selects either 1310 nm or 1550 nm based on the SDH wavelengths.
During the replacement of the standby SCC board, the hardware versions of the active and standby SCC boards can be different, but the spare and to-be-replaced SCC boards must be substitutable. In addition, the SCC boards in the subrack housing the to-be-replaced SCC board must be the same type. That is, the active and standby SCC boards must be the same after the replacement.
There is no version requirement for the standby SCC board during the replacement of the standby SCC board. This is because that the software needs to be erased using DIP switches before a spare SCC board is used to replace the standby SCC board. After the spare SCC board is inserted to a subrack, the board software of the standby SCC board will be automatically synchronized with the active SCC board.
The slots occupied by the active and standby SCC boards are not fixed. Generally, when the system starts, the SCC board with a smaller slot ID serves as the active SCC board, and the other SCC board serves as the standby SCC board. You can query the active/standby status of an SCC board by using either of the following methods:
1. View the ACT indicator of the SCC board. If the indicator is on, the SCC board is in the active state. If the indicator is off, the SCC board is in the standby state.
2. In the NE Explorer of the U2000, choose Configuration > Board 1+1 Protection from the Function Tree. Click Query. The working board, protection board, and current board can be queried. The current boards refer to the active SCC boards.
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