Data circuit-terminating equipment

Details Data circuit-terminating equipment Data circuit-terminating equipment

1988-05-27

1989-03-21

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

370 84, 375121, H04J 322

Patent

active

048150991

ABSTRACT:
There is disclosed a data circuit-terminating equipment (DCE) which connects an asynchronous data terminal equipment (DTE) with a PCM trnsmission line having various speeds. Further the DCE can satisfy recomendations of the V25 bis of CCITT. The DCE includes a PLL obtaining a clock from the line, a timing generator generating timings for circuits, a mapping circuit mapping to make data from the DTE match into the line speed, a sending register converting transmission speed of the mapping circuit output to send to the line at the instructed period, a receiving register receiving data from the line to deliver data with the required speed during the required period for the DTE, and a demapping circuit receiving the receiving register output to demap and send to the DTE. In the DCE satisfying the recommendations, the demapping circuit ANDs a clear-to-send signal and bits indicating the synchronized state to send the clear-to-send signal, and a short line shorting the clear-to-send signal and a carrier detect signal is employed.

REFERENCES:
patent: 4392234 (1983-07-01), Maruta
patent: 4471480 (1984-09-01), Haussmann
patent: 4641303 (1987-02-01), Vogl
patent: 4694470 (1987-09-01), Shimatani et al.

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