Multiplex communications – Wide area network – Packet switching
Patent
1979-10-17
1982-01-26
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370100, H04J 302, H04J 306
Patent
active
043131980
ABSTRACT:
A synchronous demultiplexer at a receiving station of a TDM/PCM telecommunication system, operating on an incoming bit stream organized in frames of 32 time slots of eight bits each, comprises a random-access memory having 32 cells loaded with consecutive octets in successive time slots under the control of a writing-address generator, stepped by clock pulses extracted from the bit stream, and unloaded at a similar but not exactly identical rate under the control of a reading-address generator, stepped by locally generated clock pulses. Two series of loading pulses a and b, each lasting for a bit period t, are derived from the extracted clock pulses near the beginning and near the end, respectively, of a time slot of duration T'=8t and are fed to a control unit together with a series of unloading pulses c of length 2t occurring once per cycle T".apprxeq.T' measured by the local clock. The control unit normally selects loading pulses a for timing the transmission of writing addresses to the random-access memory, except when these loading pulses coincide with unloading pulses c which time the transmission of reading addresses to that memory; in the latter instance, loading pulses b are substituted for pulses a.
REFERENCES:
patent: 3804987 (1974-04-01), Cooper
patent: 3872257 (1975-03-01), Bleickardt et al.
patent: 3928727 (1975-12-01), Roche
patent: 4147895 (1979-04-01), Fenoglio
patent: 4214128 (1980-07-01), Bovee et al.
Olms Douglas W.
Ross Karl F.
Societa Italiana Telecomunicazioni Siemens S.p.A.
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