20
VR & Help Point
Call termination
Calls started from the hands-free telephone can terminate in
one of three ways:
•
Polarity reversal of DC feed
•
K-break (interruption of loop current > 50ms)
•
Call progress tone: a tone received on the line, in the
frequency range 280 – 550Hz, either:
o
A continuous tone for 5s, or
o
A repeated tone (“beep”) for 5 identical repetitions.
Note that, for reliable operation, progress tone level
should be between -10dBm and -35dBm, measured at
the help point.
Induction loop
(optional)
Suitable for inductive coupling to Hearing Aids having
a `T' switch position. Supplementary power required.
Dialling and
recall mode
MF only. TBR only.
Monitored faults
and sensors
•
Hookswitch
•
Brown out (power failure)
•
Call log full
•
4 auxilliary inputs (optional)
Parameters
configurable with
TMA
•
Autodial numbers - including time-switched alternate
numbers
•
Speech receive level.
•
Rings before / after auto-answer
•
Time out (default 7 minutes)
•
Mute before dial
•
DTMF detection window
Monitoring
method
•
Remote polling (initiated by TMA)
•
Call-in (initiated by the telephone at a preset time)
Содержание 1090
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