Terminal Multiplexer TM Tributary Port Problem

Dear be_lo!

Terminal Multiplexer TM is a type of network element in SDH networks.

2M, 34M, and 140M all belong to the technical scope of PDH. SDH technology is more advanced than PDH, but SDH needs to be compatible with PDH technology, so the designer formulated the rules for PDH rate signal reuse mapping to SDH.

As shown below:

We can be seen from the figure above that the basic rate unit of SDH is STM-1, which can contain 63 2M, or 3 34M, or 1 140M.

STM-N signals are transmitted between SDH ports, and PDH signals are transmitted between PDH tributary board ports and PDH user equipment.

Thank you!

Hello,

Terminal Multiplexer (TM): A terminal multiplexer is a device that multiplexes multiple low-speed signals into one high-speed signal, or in turn demultiplexes one high-speed signal into multiple low-speed signals.
For example, the terminal multiplexer uses STM-4 for uplink; using different tributary boards can complete 2M, 34M, 140M and other signals at different rates.

Thanks