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Introduction to switching systems
Principles of digital systems
Introduction to SPC digital telephone exchanges
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achieved alignment appropriate ATTU BORSCHT call processing call record call-progress tones calling subscriber carried CCITT channel circuit clock common-channel signalling control system crosspoint described in Chapter digital line digital network digital SPC exchanges digital switch block digital transmission directory number DLTU encoding equipment number example exchange system exchange-control system facilities fault frame frame slip frequency functions hardware input signal integrated digital network interconnection interface ISDN kbit/s line code line termination maintenance Mbit/s modules multiplexing network management node on-hook operation output PABXs path PCM systems PCM/CAS pointer processor programs PSTN pulse-code modulation pulses queue received routeing RSSU samples shown in Fig signalling system slot SLTU space switch SPC systems storage stored subscriber lines subsystem switch block switch-block control switching systems synchronisation Telecommunications Telecommunications Networks telephone telephone exchanges time-division multiplexing tone traffic transmission systems transmit unit