Multiplex communications – Wide area network – Packet switching
Patent
1983-02-11
1985-08-13
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370102, H04J 300
Patent
active
045354510
ABSTRACT:
The CCITT has given recommendations for two types of hierarchies of PCM multiplex systems for telephony transmission: a first type based on a first-order PCM multiplex system having a nominal bit rate of 2048 kbit/s for 30 telephone channels while employing the A-law, and a second type based on a first-order PCM multiplex system having a nominal bit rate of 1544 kbit/s for 24 telephone channels while employing the .mu.-law.
The fourth-order digital multiplex system in accordance with the invention comprises a transmitter (1) having a digital multiplexer (7) arranged for cyclically bit-wise interleaving three digital signals having nominal bit rates of 44 736 kbit/s, the third order in the second type of PCM multiplex hierarchy, into a composite digital signal having a nominal bit rate of 139 264 kbit/s, the fourth order in the first type of PCM multiplex hierarchy, and having a specific frame structure (a in FIG. 6), while the system further comprises a receiver (2) having a digital demultiplexer (13) arranged for separating the said composite digital signal into the three original signals. This accomplishes that the fourth-order systems in both types of PCM multiplex hierarchies operate with the same nominal bit rate of 139 264 kbit/s.
REFERENCES:
patent: 3824349 (1974-07-01), Buchner
patent: 3985961 (1976-10-01), Voss et al.
patent: 4410980 (1983-10-01), Takasaki
"A Third Order Digital Multiplex Equipment Operating at 34368 Kbits/s and Using Positive Justification", by A. Barbetta, Conference on Telecomm. Transmission, London, England, Sep. 9-11, 1975.
Briody Thomas A.
Eason Leroy
Olms Douglas W.
Rokoff Kenneth I.
Streeter William J.
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