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Introduction to ESS programming
Call processing programs
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Abbreviated Dialing assembly language base level called subscriber central control CENTREX clock command unit table connection task count counter crossbar switch D-10 system DBSN decision tables detected diagnostic dial pulse dialled number digit analysis program digit sending directory number electronic switching systems example exchange execution control program fault processing function hardware input/output key hole magnetic drum magnetic tape main memory maintenance engineer memory pool metering pulse method modules MOTHER FILE number translation table off-hook on-hook originating subscriber output parameters processor queue request restart processing service order shown in Fig signal specified speech path control state-transition diagram stored subscriber analysis subscriber data subscriber line supervisory memory switching operation system file task decision task execution control task macros task number task table teletypewriter unit terminating line terminating subscriber traffic measurement transaction memory block trunk circuits trunk memory word