Page 24 of 40
Issue 2
13/12/99
PETS-2 Crossing Telephone System
QUICKFIX INSTALLATION HANDBOOK
24
5.6.1 Signal Box Unit
a) Operating mode is ALL CALL - this means that Line 1 of the Signal Box Unit is mapped
to Lines 1, 2, 3 & 4 of the Level Crossing Unit (Lines 3 & 4 are not normally equipped on
the Level Crossing Unit).
b) Call Signalling Relay contact - this controls a remote call sounder and is set to operate
continuously.
c) Line circuit type - this is set to operate with a control telephone on Line 1
d) Software - the Signal Box unit is obviously configured to operate with Signal Box
software.
e) Signal Box Location - the unit is factory set as the terminating Signal Box, i.e. not as an
intermediate as part of a block switching scheme.
f) Transmission circuits - set for four wire operation
g) Data Update - Intrude tone is applied and manual operation of the INTERROGATE
button is required to update status.
5.6.2 Level crossing Unit
a) Intrusion tone on I/O change - set to disabled (NB In the original PETS this function was
enabled. The previous use of I/O was for barrier signalling. Now that the I/O is used for
equipment alarms it is not imperative that the Signaller is alerted during a call).
b) Second Caller - when a second telephone is operated (paired or solo), the second caller
will receive ring tone until the Signaller answer that call.
c) Each of the equipped line cards are configured for 2 wire Loop Disconnect calling.
d) Transmission circuit - set to four wire operation
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