H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/25
H04Q 11/04 (2006.01) H04Q 11/06 (2006.01)
Patent
CA 1088656
ABSTRACT OF THE DISCLOSURE Space interchange of PCM words are carried out by means of a circulating shift register. The PCM words are transmitted on a number of incoming and outgoing links during time slots according to a time division multiplex system. At the beginning of their allotted time slots, the incoming PCM words are registered each in an associated shift register stage. The circulating shift register is clocked sufficiently fast for each PCM word to pass through all shift register stages during the respective time slot. By means of control words each associated with one of the time slots and with one of the outgoing links is determined during which clock pulse said outgoing link is connected to the output of its associated shift register stage. A buffer memory is arranged between the circulating shift register and the outgoing links in order to re-establish the correct time division multiplex system for the outgoint PCM- words.
277307
Andersson Karl O.i.
Ryden Lars O.
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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