2-1. Front Panel Controls and Indicators-Continued.
ALARM Horn. Horn produces an orderwire tone (steady tone for 10 seconds) or an alarm tone
(continuous beeping tone until turned off) under the following conditions:
. Orderwire tone is generated when one of following conditions occur:
1. Incoming orderwire call is received. (Tone is silenced if answer orderwire call routine is performed
before 10-second cycle is completed or ALARM RESET switch is pressed.)
2. Incoming control telemetry transmission is received, (Tone is silenced if receive control telemetry
routine is performed before 10-second cycle is completed or ALARM RESET switch is pressed, )
. Alarm tone is generated when one of following conditions occur:
1. Faulty condition is detected by TD-1337(V)/G. (Tone is silenced if faulty condition goes away
or ALARM RESET switch is pressed.)
One of ALARMS indicators, except ALARMS MINOR, will light when
alarm tone is generated.
2. If horn is silent, as result of pressing ALARM RESET switch, tone is generated when a previously
detected fault goes away (fault is no longer detected).
An ALARMS indicator may, or may not, go off when horn is ac-
tivated by this condition,
Alarm tone can occur erratically as a result of multiple faults being
detected, presence of intermittent faults, and operator pressing
ALARM RESET switch each time tone occurs. Performing 5-minute
audible alarm inhibit routine will silence tone for five minutes (or
until inhibit is cancelled by operator, )
ALARM RESET Switch. Pushbutton switch is pressed to manually silence active ALARM horn.
HANDSET H-250 Connector. Front panel connector for attaching an H-250 handset to TD-1337(V)/G.