MERLIN LEGEND Communications System Release 5.0
Feature Reference
555-650-110
Issue 1
June 1997
Features
Page 389
Multi-Function Module
Tip/Ring Interface
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When an MFM is set for tip/ring interface operation, only dual-tone multifrequency
(DTMF) tip/ring devices can be used to make and/or receive inside and outside
calls. The following types of DTMF devices can be used:
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Single-line telephones
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Modems
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Fax machines
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Credit card verification terminals
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Cordless single-line telephones
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Speakerphones that emulate a tip/ring device
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Answering machines
Supplemental Alert Adapter
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8
When an MFM is set for SAA operation, an external alert that requires a 48-VDC
contact closure can be connected.
If the external alert is used to supplement the ringing for both inside and outside
calls, the MFM should be assigned (through centralized telephone programming)
as a Primary Individual Coverage receiver with the Ring Timing option of
Immediate Ring. The MLX telephone can use Coverage On/Off to activate the
alert. In addition, by specifying that both inside and outside calls or only outside
calls are covered with the coverage arrangement, the sender (in this case the
MLX telephone user) can specify that the device (the receiver) should ring for both
inside and outside calls or only for outside calls.
If the external alert is used to supplement ringing only for calls received on
personal lines (outside lines assigned to buttons), the same outside lines/trunks
and ringing options assigned to the MLX telephone should also be assigned to the
MFM. In this arrangement, the MFM device does not ring when inside calls are
received on an SA or ICOM button.
An external alert connected to an MFM set for SAA operation can be manually
signaled, can serve as a calling group calls-in-queue alert, or can provide
supplemental alerting for after-hours calls received in a Night Service group. Only
a strobe or other light should be used as a calls-in-queue alert; if a bell is used, it
rings continuously while the number of calls in the calling group queue exceeds
the programmed threshold.
Programming Requirements
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Although a device connected through an MFM may not have buttons, the system
treats it as a multiline telephone with 34 buttons. In Hybrid/PBX mode, the system
automatically assigns one SA Ring, one SA Voice, and one SA Originate Only
button to the MFM. In Key mode, the system automatically assigns one ICOM
