Multiplex communications – Wide area network – Packet switching
Patent
1979-12-21
1981-08-18
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
307243, 307254, H04J 302, H03K 1700
Patent
active
042850576
ABSTRACT:
A sampling gate of a TDM telephone system, designed to connect a subscriber station to a trunk line during an allocated time slot, comprises a pair of bucking transistors of the same conductivity type (NPN) inserted between a live wire from the station and a corresponding "hot" conductor of the trunk line whose "cold" conductor, tied to the reference wire of the subscriber line, is grounded through an elevated resistance. During the allocated time slot, the two bucking transistors are rendered conductive by a timing pulse applied across their base/emitter circuits via a transformer while a connection leading from their bases to negative biasing potential is temporarily severed by an interposed FET which is cut off by the timing pulse applied to its gate electrode via a differentiation circuit.
REFERENCES:
patent: 3621288 (1971-11-16), Brown
patent: 3969638 (1976-07-13), Marchetti et al.
"Principles of Pulse Code Modulation" by Catterhole, London, Iliffe Books Ltd., (1969), pp. 30-33.
Olms Douglas W.
Ross Karl F.
Societa Italiana Telecomunicazioni Siemens S.p.A.
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