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Switch a/k/a 5E CO End Office

CENTREX. GENERIC. CENTREX*. Incoming call – Look at the digits. Where do I need to connect this? (What port?) Available or busy? Forward? Voice mail?. DECISIONS*. DECISIONS*. Outgoing call – Look at the digits. Does it stay here or leave? Is it local BellSouth?

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Switch a/k/a 5E CO End Office

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  1. CENTREX GENERIC CENTREX* Incoming call – Look at the digits. Where do I need to connect this? (What port?) Available or busy? Forward? Voice mail? DECISIONS* DECISIONS* Outgoing call – Look at the digits. Does it stay here or leave? Is it local BellSouth? Is it local CLEC or toll? Do I have an empty channel? Overflow or fast busy? ……………………etc etc etc Switch a/k/a 5E CO End Office CENTRAL OFFICE To LATA Tandem for routing per PIC or LPIC CUSTOMER PREMISES Line Side Card Station Ports Analog or Digital CENTREX* Trunk Side Cards Interoffice trunking Does this number (port) belong to this CTX group? Features - Is it allowed to do what it’s asking to do? Calling out – How many NARs? How many are active now? Process the call or return busy? NARS Trunk Side Cards Interoffice trunking Local Service To / From other BellSouth local end offices Network Access Registers (NARs) are the gateway between the private Centrex and the public switched network. They are the soft ware equivalent of lines or trunks, providing inward, outward or two-way access. Internal calls do not use NARs.

  2. CENTREX & CENTREX PRI with Business Communications Manager Line Side Card Line Side Card Station Ports Station Ports DECISIONS* Switch a/k/a 5E CO End Office CENTRAL OFFICE CENTREX PRI CUSTOMER PREMISES CENTREX* Trunk Side Cards Interoffice trunking NARS INCOMING & OUTGOING CALLS Trunk Side Cards A BCM is a small version of a very intelligent switch. Centrex numbers for the stations are carried across a PRI used as 23 tie lines. NARs: Network Access Registers Trunk equivalents: How many simultaneous calls are allowed to/from “outside” The BCM also has features, voice mail and many advanced options for call handling, but is still able to make on-net calls to other Centrex stations outside the BCM.

  3. CENTREX & CENTREX PRI Connecting to a PRI ISDN Compatible Switch CO NARs CENTREX DIAL 9 “OUTSIDE” CALL FIRE STATION CITY HALL “OUTSIDE LINES” 1 Centrex PRI 1 Centrex PRI FOUR DIGIT NUMBER CALL Parks POLICE CITY Fiber

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