A Digital Telephone with Extensions

A digital telephone concept is described where each subscriber set sends and receives digital signals (8-bit PCM). Duplex, simultaneous operation of extensions on a single pair of wires is made possible by time division multiplex (TDM) techniques. A successful feasibility demonstrator of the concept...

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Bibliographic Details
Published in:I.R.E. transactions on communications systems 1981-11, Vol.29 (11), p.1602-1608
Main Authors: Abraham, L., Fellows, D.
Format: Article
Language:English
Subjects:
Circuit testing
Costs
FCC
Phase change materials
Power generation economics
Switches
Switching circuits
Telephony
Time division multiplexing
Wires
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Description
Summary:A digital telephone concept is described where each subscriber set sends and receives digital signals (8-bit PCM). Duplex, simultaneous operation of extensions on a single pair of wires is made possible by time division multiplex (TDM) techniques. A successful feasibility demonstrator of the concept that operates at 512 kbits/s is also described. It has a digital switch at one end and digital telephones at the other, with up to three extensions talking at one time. The telephones feature a separate digital signaling channel, automatic loop-back testing, and low-power transducers.
ISSN:0090-6778
0096-2244
1558-0857
DOI:10.1109/TCOM.1981.1094906