Multiplex communications – Wide area network – Packet switching
Patent
1987-02-19
1988-08-09
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 58, 379273, 340827, H04J 116
Patent
active
047633166
ABSTRACT:
A circuit for a centrally controlled time division multiplex telecommunication exchange having PCM line/trunk groups connected to a switching network wherein each line/trunk group comprises a plurality of line units to connect one time division multiplex interexchange trunk each and is connected to a switching network over a time division multiplex line. Two line/trunk groups are assigned to each other in pairs. The connection devices which are assigned to one and to the other of two line/trunk groups and which in normal operation are connected with the time division multiplex switching device of each of their own line/trunk group can be changed over during emergency operation of one of the two line/trunk groups to the time division multiplex switching device of the other line/trunk group.
REFERENCES:
patent: 4382294 (1983-05-01), Beuscher et al.
Telecom Report 4 (1981); Beiheft, "Digital Vermittlung-System EWSD"; Siemens Aktiengesellschaft; 1981; pp. 1-74.
Schaich Gerhard
Schoenauer Ludwig
Morris Jeffrey P.
Olms Douglas W.
Scutch III Frank M.
Siemens Aktiengesellschaft
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