Patent
1977-08-18
1979-02-06
Robinson, Thomas A.
179 15BA, H04J 300
Patent
active
041385969
ABSTRACT:
European 30-channel PCM multiplex systems and Anglo-Saxon 24-channel PCM multiplex systems are both standardized in accordance with CCITT recommendations. However they have different nominal binary rates. The connection equipment, according to this invention, provides for connecting a plurality of European PCM multiplex systems with a plurality of Anglo-Saxon PCM multiplex systems. Multiplex words are stored in parallel word memories for two-way transmission in forward and backward directions. Inside the equipment, parallel word write and read operations are performed at predetermined times, corresponding to some selected Anglo-Saxon PCM multiplex system bit times. Write and read parallel word memory addresses are determined by means of a control memory that is read in synchronism with Anglo-Saxon PCM multiplex system bit rate.
More generally the equipment enables different types of PCM multiplex networks to be interconnected. That is particularly useful for providing a time-division switching center, initially designed for switching a PCM multiplex of one type, within a network using a PCM multiplex of the other type.
REFERENCES:
patent: 3597548 (1971-08-01), Drinnan et al.
patent: 3766322 (1973-10-01), Moffett et al.
patent: 3862370 (1975-01-01), Kadota
patent: 3982077 (1976-09-01), Clark et al.
Laff Charles A.
Robinson Thomas A.
Rockman Howard B.
Whitesel J. Warren
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