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Transmux
TRANSMUX (Transcode-Multiplexing) is a signaling format change in telecommunications signaling between synchronous optical network signals SONET and asynchronous DS3 signals. A DS3 signal is multiplexed from 28 individual DS1 signals in a bit-interleaved fashion, with framing and overhead at determined intervals. SONET differs from this approach by using a byte-interleaved, synchronous, multiplexing technique with several variations on payload types.
==Usage==
If a DS3 signal is to be transported over a SONET path, it must be completely demultiplexed and remapped into the SONET format. This same action occurs in reverse when converting a SONET payload back into a DS3 at the opposite end of a path. This is useful for telecommunications equipment where 'bridging' between legacy electrical transport networks and optical transport networks is desired. Bridging physically is complex and expensive, and would require demultiplexing and terminating all 28 electrical DS1 signals on one interface, then remultiplexing each DS1 up into each respective SONET VT1.5 payload. Transcoding is necessary because an electrical DS3 signal is bit-interleaved, that is, each bit of DS1 signal time slot is spread over the entire DS3 frame one bit at a time. In a SONET signal, each payload time slot exists with all bits contiguously within its time slot, so in order to covert (transcode) DS1s into VT1.5s, all bit must be extracted from a DS3 frame to collect each DS1 payload, then after resorting and buffering, this payload able to be mapped contiguously in the SONET time slot. With transmuxing, both steps (transcoding and multiplexing) are accomplished simultaneously in one piece of equipment, reducing the complexity and cost of interconnecting the different networks and transport methods.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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