User's Manual

56019201
Pag
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© 2000 Telular Corporation
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the telco line is cut or the C/C is unable to communicate with the central station receiver due to busy
telephone line circuits then Telguard transmits the alarm message over the cellular network.
2.2 C/C C
OMPATIBLE
C
OMMUNICATION
F
ORMATS
The Telguard reads the C/C’s alarm messages and converts the C/C’s digital data format into Microburst
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 one of
the following non-extended formats:
•
3+1 pulse; 10pps, Double Round, 1400Hz ack
•
3+1 pulse; 20pps, Double Round, 2300Hz ack
•
3+1 pulse; 40pps, Double Round, 2300Hz ack
•
4+2 pulse; 20pps, Double Round, 1400Hz ack
•
4+2 pulse; 20pps, Double Round, 2300Hz ack
•
4+2 pulse; 40pps, Double Round, 2300Hz ack
•
Radionics Modem IIE or 3A
2
•
Ademco Contact ID
Hexadecimal account numbers (001-FFF or 0001-FFFF) can be used with 3+1 or 4+2 formats, but Contact
ID and Radionics modem IIE or 3A
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requires a four digit account number using digits 0-9 (0001-9999).
2.3 C
OMPLETE
S
UPERVISION OF
C
OMMUNICATION
P
ATHS
The Telguard continuously supervises both the primary (telco) and the secondary (cellular) 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 and Telguard switches to the cellular path. Once the
telco line restores to normal, Telguard checks the radio link and switches back to the telco path after
any communications on the radio link are completed.
LFC is programmable to trip the supervisory relay output (STC) after a 30 or 60 second delay.
When the STC 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
STC relay and LFC LED are returned to normal and a STC restoral message is transmitted if the
C/C is programmed to transmit restorals.
2.3.1.1 PBX Installations
PBX’s and other proprietary phone systems sometimes operate at lower voltages than the
standard telco line. Telguard works equally well on PBX lines or telco lines.
Note
: PBX connections are not allowed in any UL Listed installations.
2.3.2 Telco Communications Failure Condition (CFC)
Telco communications failure condition (CFC) is declared when the C/C fails to deliver the alarm
message to the central station receiver after a selected number (1-5) of attempts over an operative
telco line. Immediately upon CFC, Telguard switches to cellular mode and allows the C/C to
attempt five transmissions over the cellular network. If the call is not acknowledged after the fifth
attempt, Telguard switches the C/C back to telco and “disarms” the CFC detection. The CFC
detection is re-armed when the C/C has been on-hook continuously for ten-minutes.
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 (STC) after a 30 or 60 second delay.
When the STC 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.