Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 50 of 118
This document is uncontrolled when printed.
3.8.6 Other Brand Modems
Modem designs are changing at a rapid pace. Manufacturers are
designing new features into their modem products which may not be
compatible with existing monitor/modem installations. Not all modems
are the same and their can be problems with connecting different
brand modems especially on the poor phone line encountered in
country areas. Please contact Signal Engineering for advice on
different modems and possible replacement modems.
3.9 Telephone line
The telephone line is a normal telephone line. It may be tested by
plugging in a normal telephone, then using the phone to ring
someone and receive a call. When talking listen for any "noise" on
the line. Excessive noise will prevent the modem from working
correctly. An indication of possible telephone line problems is when
there seems to be a high number of failed connections from a
remote site.
3.10 Interface Relays and Timer
The following list contains the additional relays and timers required
for the Level Crossing Monitor installation: Refer to Appendix D for
the specification sheets of the relays and timers.
1. BATTERY TEST Relay: QBCA1 12V DC. This relay is a
standard Q type relay and is available from RSA stores and
other suppliers, Cost approximately $350. The base must also be
ordered.
2. TIMER TEST Relay: HH23PW-T 12V DC. This relay is a 11-pin
relay with 3 changeover contacts, MI No:06600415. This relay
and a matching base is available from RSA stores. The 11-pin
base mounts onto DIN rail, MI No:06600076.