Multiplex communications – Wide area network – Packet switching
Patent
1983-12-12
1986-04-08
Orsino, Jr., Joseph A.
Multiplex communications
Wide area network
Packet switching
370118, H04J 312
Patent
active
045817375
ABSTRACT:
A bit compression multiplexer for a pair of time division multiplexed digital bit streams each one of which includes a plurality of PCM encoded signals deposited in separate and distinct channels and signaling bits multiplexed therewith. The encoded signals are bit compressed (22), and then multiplexed and grouped (25) into clusters. Each of the multiplexed compressed signals occupies a separate and distinct channel of a repetitive frame that includes a plurality of clusters and a corresponding number of additional channels, called delta channels, each one of which is associated with a given cluster and is proximate thereto. The signaling bits are extracted (21) from the pair of digital bit streams, reformatted (24) and then placed in predetermined bit positions of the delta channels. The signaling bits in a given delta channel are associated with the compressed signals of a cluster proximate thereto. The combination of a cluster and its related delta channel comprise a bundle. A framing bit pattern is developed (23) for each bundle and the framing bits are placed into a predetermined bit position of each of the delta channels (24). The framing bit pattern is arranged to detect frame slips which occur either at a transmitting bit compression multiplexer, at a receiving bit compression multiplexer or at other components of the transmission system, for example, at a Digital Access and Cross-connect System (DACS).
REFERENCES:
patent: 3909540 (1975-09-01), Maryscuk et al.
patent: 4059731 (1977-11-01), Green et al.
patent: 4301534 (1981-11-01), Genter
patent: 4358845 (1982-11-01), de Passoz
patent: 4397020 (1983-08-01), Howson
"Pulse Code Modulation and Digital Transmission", White Crescent Press Limited, G. H. Bennett, 1976, pp. 33-35.
AT&T Bell Laboratories
Orsino Jr. Joseph A.
Stafford Thomas
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