Patent
1976-01-27
1977-05-31
Brown, Thomas W.
H04J 316
Patent
active
040271064
ABSTRACT:
A processor in a telephone exchange, monitoring the activity of r subscriber lines having each an incoming and an outgoing channel allocated to them, emits during respective halves of any 8-bit time slot in a 32-time-slot frame a pair of m-bit addresses x, y for each subscriber initiating or engaged in a conversation, these addresses respectively identifying an outgoing channel of a first (e.g. calling) subscriber and an incoming channel of a second (e.g. called) subscriber to be placed once per frame in communication with each other by a PCM switching network. The addresses of incoming and outgoing channels issuing from the processor during each time slot are separated in a distributor, the addresses y being inscribed in stages of a storage network respectively assigned to the 32.sup.. 32.sup.. n channels identified by addresses x. The storage network consists of n random-access memories, one for each of n channel groups, divided into 32 sections of 32 stages each for as many 32-channel families. Each of 32 scanning intervals composed of n phases, occurring within a time slot, is reserved for the successive readout of homothetic stages in a respective set of n corresponding sections of all the memories, the set being divided into two subsets respectively scanned in the presence of relatively staggered enabling pulses also spanning n phases each whereby the readout of each subset starts after the beginning and terminates before the end of the corresponding enabling pulse.
REFERENCES:
patent: 3878338 (1975-04-01), Hardy
patent: 3920916 (1975-11-01), Brightman et al.
Belforte Piero
Guaschino Giancarlo
Perucca Giovanni
Brown Thomas W.
Cselt - Centro Studi E Laboratori Telecomunicazioni Spa
Dubno Herbert
Ross Karl F.
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