H.100 (computer telephony)
Encyclopedia
H.100 and H.110 are legacy telephony equipment standard published by the ECTF
ECTF
ECTF was formed in1995 by telephony equipment and software suppliers toimprove the interoperability of various vendors’ CT solutions.Until ECTF was formed, the computer telephony industry was an...

 that allow the transport of up to 4096 simplex channels of voice or data on one connector or ribbon cable. H.100 is implemented using Multi-Channeled Buffered Serial Ports (McBSP) typical included as a DSP
Digital signal processing
Digital signal processing is concerned with the representation of discrete time signals by a sequence of numbers or symbols and the processing of these signals. Digital signal processing and analog signal processing are subfields of signal processing...

 peripheral. McBSP, also known as TDM Serial ports are special serial ports that support multiple channels by using Time-division multiplexing
Time-division multiplexing
Time-division multiplexing is a type of digital multiplexing in which two or more bit streams or signals are transferred apparently simultaneously as sub-channels in one communication channel, but are physically taking turns on the channel. The time domain is divided into several recurrent...

(TDM).

The McBSP / TDM Serial Port Interface is as follow:
  • CK: Clock
  • FS: Frame Sync
  • DR: Data Receive
  • DX: Data Transmit
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