Multiplex communications – Wide area network – Packet switching
Patent
1981-12-09
1984-12-11
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 68, 370108, H04J 300
Patent
active
044882920
ABSTRACT:
A line trunk group is connected by way of a compensating memory to an input and, in fact, to those of the time slot multiples of the PCM switching network. Uniform time slots of the pulse frame boundaries within the switching network are provided. However, in the last switching stage and, in fact, in time slot multiples, displacement of a pulse frame boundaries in the lines leading back to the trunk line groups is provided. In this manner, line trunk groups acquire the frame clock rate. This influences, in respect of time slots, the transmission of sub-items of information from the line trunk groups to the switching network with regard to pulse frames of these sub-items of information, i.e. the relevant time slot of the pulse frame boundaries. Cable transit time on lines from the switching network to the line terminal group and from the line terminal group to the switching network, and delaying influences within the line trunk group which result in partially constant and partially variable delay values, are compensated, in part, by the above-mentioned displacement and, in part, by storage in the compensating memory, which can be adapted in terms of storage time, and, in fact, by increasing the delay to a full pulse frame duration or in multiple thereof. Economy of storage capacity in the compensating memory is therefore provided.
REFERENCES:
patent: 3576947 (1971-05-01), Kruger
patent: 3649763 (1972-03-01), Thompson
patent: 3881064 (1975-04-01), Schlichte
Olms Douglas W.
Scutch III Frank M.
Siemens Aktiengesellschaft
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