Installation Instructions

56025001 Page © 2003 Telular Corporation
5
2.0 FEATURES
This section summarizes the key features of the Telguard. Actual installation instructions begin in Section
5.0.
2.1 OPERATING MODE
The Telguard is a digital cellular SMS transmission device that is installed at the protected premises to
provide alarm transmission integrity for security systems and a separate digital cellular voice service. It is
used to provide a primary transmission path (cellular) for control communicators (C/Cs). If the cellular
path is not available the C/C will transmit the alarm message over the telco network. Voice calls can be
made using POTS telephone equipment attached to RJ-11 jacks wired to the WVL terminal block.
2.2 C/C COMPATIBLE COMMUNICATION FORMATS
The Telguard reads the C/C’s alarm messages and converts the C/C’s Ademco Contact ID (DTMF) data
format into SMS packet data protocol for transmission over the cellular radio network. In order for the C/C
to be compatible with the Telguard, the C/C must be programmed to transmit alarm messages to the central
station using Contact ID only.
2.3 COMPLETE SUPERVISION OF COMMUNICATION PATHS
The Telguard continuously supervises both the primary (cellular) and the secondary (telco) communication
paths. If either path becomes inoperative, the Telguard generates a relay trip output that can be connected to
a zone input of the host control communicator and/or used to activate remote sounding devices.
2.3.1 Line Fault Condition (LFC)
The Telguard monitors voltage on the incoming telco line. If an inoperative telco line is
identified, a telco line fault condition (LFC) is declared.
LFC is programmable to trip the supervisory relay output (STC1) after a 30 or 60 second
delay. When the STC1 trips, the STC LED indicates 3 flashes at a time and the C/C zone
trip message is transmitted to the alarm company central station indicating system
trouble. Upon telco restoral, the STC1 relay and STC LED are returned to normal and a
STC restoral message is transmitted if the C/C is programmed to transmit restorals. Both
STC relays have same functionality and are independently fully programmable. Update
as you see fit.
2.3.3 No Service Condition (NSC)
Telguard declares a no service condition (NSC) when the measured “receive” cellular
radio signal strength at the protected premises drops to -114 dBm or less.
NSC is programmable to trip the supervisory relay output (STC2) after a 30 or 60 second
delay. When STC1 trips, the STC LED indicates 4 flashes at a time and the C/C zone trip
message is transmitted to the central station indicating system trouble. Restoral of this
condition occurs when a measurable signal strength greater than –114 dBm is maintained
for the trip period of 30 or 60 seconds.
2.3.4 Radio Communications Failure Condition (RFC)
Radio communications failure condition (RFC) is declared when Telguard is unable to
transmit over the cellular network even with acceptable signal strength. Two conditions
can cause an RFC to occur, Link Request failure (RFC1) or Link Termination failure
(RFC2).
2.3.4.1 RFC1 (Link Request Failure)
When there is an alarm signal to communicate, the Telguard attempts to transmit
its message via radio. When the C/C goes off-hook, the Telguard transmits a
Link Request to the TCC and waits for a Link Request ACK. If the Telguard
does not receive an ACK for the transmission before the C/C hangs up, it will
retransmit the Link Request again when the C/C goes off-hook for a redial
attempt. If the Telguard does not receive an ACK after three attempts, then an
RFC will be declared which trips the STC2 relay, causes the STC LED to flash