SSM-32 Self-Cascading in UMG8900

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In the SSM-32 self-cascading, up to three frames can be cascaded. The service frame is connected to the main control frame through the 1 FE + 1 time division multiplexing (TDM) cascading channels or 1 FE + 2 TDM cascading channels. When the UG01TNC is adopted, 1 x 8 K TDM cascading channel is provided. In this case, the service frame must connect to the main control frame through TDM cascading optical interface 0 (the one on the top). When the UG02TNC is adopted, 2 x 8 K TDM cascading channels are provided. The service frame must connect to the main control frame through TDM cascading interfaces 0 and 1 on the TNC.

The central switching frame and the main control frame are integrated into one frame, which is always numbered 1. When one TDM cascading channel is provided, the TNC on the main control frame (central switching frame) needs to provide two TDM cascading interfaces. When two TDM cascading channels are provided, the TNC in the main control frame (central switching frame) needs to provide four TDM cascading interfaces.

Figure 1 shows the self-cascading of three SSM-32 frames.

Figure 1 Self-cascading of three SSM-32 frames

1#: main control frame

2#: service frame

3#: service frame

If the GE plane cascading exists, the MPB needs to be inserted into the service frame to implement packet switching. In this case, insert the NLUs in slots 4 and 5 and slots 10 and 11 of the main control frame to implement the GE plane cascading between the two service frames.