Data rate conversion and supervisory bit insertion in a data...

Details Data rate conversion and supervisory bit insertion in a data... Data rate conversion and supervisory bit insertion in a data...

H - Electricity

04

J

354/103

H04J 3/06 (2006.01) H04J 3/07 (2006.01) H04J 3/12 (2006.01) H04L 25/05 (2006.01)

Patent

CA 1228928

DATA RATE CONVERSION AND SUPERVISORY BIT INSERTION IN A DATA SYSTEM JOHN B. MC NESBY AND JOSEPH F. KRYS ABSTRACT OF THE INVENTION A data rate converter for use in telecommunications inserts supervisory bits into a data stream to increase the data rate, in one application, from 56 kbps to a standard 64 kbps. A standard 64 kbps PCM telephone channel uses 8-bit words for transmission, whereas 56 kpbs occupies only 7 bits of an 8 bit word in such a telephone channel. Supervisory bits are inserted at the exact time when the data channel clock signal and the transmission line clock signal are in phase alignment.

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