Key System US Atlas IIE KSX 32i, Installation Manual

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Trunk Card (COU)
4.11. The system can be equipped with one or two Trunk Cards (COU). Each Trunk Card
supports 4 trunk interface circuits for loop-start trunk applications. Each trunk
requires a 1-pair connection.
4.12. Each Trunk Card contains the circuitry for ring detection, DTMF and pulse dialing,
and music-on-hold distribution.
4.13. Each trunk interface circuit includes a two-way dual amplifier. If amplification is
required on the trunk, move the jumper JP1 to the 'amp' position.
4.14. Trunk line connections are accessible on the right side of the cabinet through
modular jacks.
4.15. There are a number of programmable trunk functions.
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Trunk Types: Trunks can be connected to Central Office or PABX lines (Mode
11). When connected to a PABX, the access code is ignored for toll restriction.
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Trunk Signaling: Trunk dialing output can be DTMF or pulse (Mode 11). For
pulse dialing, the pulse-per-second rate (Mode 13) and make/break ratio (Mode
14) can be set. For DTMF dialing, the tone duration is adjustable (Mode 17).
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Flash Duration: The timed-line disconnect sent to the distant office can be set
(Mode 15) for proper recognition.
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Trunk Ringing at Loud Bell: Each trunk can be assigned to ring at the loud bell
(Mode 11) for both day service and night service.
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Trunk Access as Private Line: Each trunk can be designated as a private line
(Mode 21) and assigned with access allowed only by selected stations (Mode
22). Individual trunk ringing (Mode 39, 40, 41, 42), call pickup (mode 24), and
common ring night service (Mode 23) are available features.
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Trunk Hunt Groups: Trunks can be assigned to hunt groups (1 - 8) for outgoing
call access (Mode 25). Trunks are accessed in terminal or distributed mode
(Mode 28). A trunk hunt group can be accessed using a dial code (Mode 27) or
automatically selected at station off-hook.