Interface circuit for digital telephone facilities

Details Interface circuit for digital telephone facilities Interface circuit for digital telephone facilities

1978-04-28

1979-05-15

Claffy, Kathleen H.

179 15BS, 179 15A, H04J 306

Patent

active

041549856

ABSTRACT:
A digital telephone signal interface circuit couples data signal from one digital telephone facility, operating at one data bit rate, to another digital telephone facility operating at another data bit rate. The interface circuit includes a storage system and a frequency converter circuit. The frequency converter circuit includes an analogue frequency converter circuit for multiplying the frequency of a signal applied thereto by a whole number and a digital frequency converter circuit for reducing the frequency of a signal applied thereto by a factor of at least two. The analogue and digital converter circuits are connected in series and generate a second synchronizing signal for the operation of the other digital telephone facility in response to a first synchronizing signal from the one digital telephone facility. The storage system receives data signals from the one digital telephone facility and in response to the second synchronizing signal couples the received data signals to the other digital telephone facility.

REFERENCES:
patent: 3692941 (1972-09-01), Collins et al.
patent: 4006314 (1977-02-01), Condon et al.

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