| 摘要 |
<p>This elementary switching unit includes, for each incoming frame transmission medium:
- means of extracting signals consisting of multiplexing units to be cross-connected from the incoming frames,
- a memory (1), referred to as the memory for signals consisting of multiplexing units to be cross-connected, and which is able to hold at least N signals, where N denotes the period of the stream of lowest bit rate of the multiplexing hierarchy,
- means (2, 3) for ensuring writing of this memory, in synchronism with the extraction rate, to distinct addresses in respect of signals constituting distinct multiplexing units to be cross-connected, and to identical addresses in respect of signals constituting a same multiplexing unit to be cross-connected, the frequency of rewriting of each address being related to the period of repetition of the signals written to this address,
- means (20, 21, 22) for ensuring reading of this memory, in synchronism with the rate of insertion into the outgoing frames of signals constituting multiplexing units to be cross-connected, at addresses determined by the said distribution law.
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