Patent
1976-05-07
1977-11-15
Cooper, William C.
179 15BA, H04J 306
Patent
active
040586839
ABSTRACT:
Four bit streams arriving simultaneously over respective incoming lines at a transmitting terminal, connected via a PCM link with a remote receiving terminal, constitute recurrent lower-order frames whose bits are to be interleaved in a composite higher-order frame to be sent on to the remote terminal for redistribution over four outgoing lines. The bits of each incoming bit stream are cyclically written in an 8-stage buffer register at their rate of arrival, the contents of the register stages being read out at a higher rate to allow for the interpolation of ancillary bits constituting supervisory signals. Each higher-order frame consists of four subframes in which the message bits from the contributing bit streams are preceded by one or more ancillary bits; the latter include a discriminating bit in each of the last three subframes indicating whether or not a further bit in the fourth subframe is a stuffing bit or a message bit. The insertion of a stuffing bit, i.e. the delay by one time slot of the readout of a message bit from a stage of the buffer register, is controlled by a comparator receiving writing and reading pulses respectively timing the loading of the eighth register stage and the unloading of the fourth register stage; upon a coincidence of these pulses in a first subframe, a presetting section of the comparator enables an execution section thereof to emit a stuffing command in the following three subframes causing the generation of the discriminating bit at the beginning of each of these subframes and the blanking of the time slot immediately following the last discriminating bit.
REFERENCES:
patent: 3873773 (1975-03-01), Guy
patent: 3931473 (1976-01-01), Ferris
Cooper William C.
Popek Joseph A.
Ross Karl F.
Societa Italiana Telecomunicazioni Siemens S.p.A.
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