Multiplex communications – Wide area network – Packet switching
Patent
1985-06-12
1986-06-24
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
H04Q 1104
Patent
active
045970750
ABSTRACT:
A plurality of routing modules in a switching network of a telecommunication system each includes several interfaces connected to a first channel concentrator via respective data stores receiving and temporarily memorizing incoming data words coding the voltage levels of message samples from associated peripheral units served by the respective interface. In response to commands from a control unit, included in the module, this first concentrator selectively transmits memorized data words in respective phases of a PCM frame to all the modules in the network. Outgoing data words issuing from any routing module are registered in other data stores and selectively extracted therefrom by a second channel concentrator under instructions from the control unit, the extracted data words being distributed by a channel expander commanded by the control unit to registers assigned to respective peripheral units. The contents of these latter registers are read in a predetermined sequence to the interfaces for transmission to the peripheral units in response to instructions generated by the control unit. A PCM frame has 32 time slots of 8 phases each, the maximum number of peripheral units served by each interface being equal to the number of phases per PCM frame, i.e. 256. A conference bridge may be provided in each module for the implementation of multiparty calls between telephone subscribers.
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Dubno Herbert
Italtel-Societa Italiana Telecomunicazioni S.p.A.
Olms Douglas W.
Rokoff Kenneth I.
Ross Karl F.
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