Nortel Millennium multi-pay M1211, Инструкция по установке, эксплуатации и обслуживанию

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Describing the terminal 1-21
Supplemen­
tary power
Answer
supervision
Remote
alarms and
diagnostics
Each terminal requires a supplementary low voltage direct-
current power source, typically less than 500 mA at 24 volts
DC. A wall transform er connected to a commercial 110 V AC
source can provide this. The supplementary power source
must be supplied by the operating company. The supple­
mentary power requirements are described in Chapter 12.
If the supplementary power supply fails, the terminal reverts
to the power-fail mode, so caller can make emergency and
operator-assisted calls. Volume control is available in this
mode. The type of calls that can be made are dictated by the
operating company.
The terminals use answer supervision to time calls for billing
records and payphone statistics.
If answer supervision is not available on the line, an inferred
answer supervision (IAS) module can be installed inside the
terminal.
The IAS module can be ordered in either of two versions.
• One version is most compatible with high-quality lines,
where weaker signals are clearly discernible.
• A second version can be used where the CO equipment is
older or the lines or environment are noisier.
Firmware on a basic module design defines the version.
The Millennium multi-pay terminal transmits alarms to the
Millennium Manager when interruptions in service occur.
The messages are passed on to whatever service destina­
tions the operating company has designated. These alarm
messages are listed in Appendix A.
At the terminal, the craftsperson uses the craft interface to
pinpoint the area of the problem and the module causing the
problem. These error messages are listed in Appendix B.
Millennium multi-pay terminal installation, operation, and maintenance guide