56050301 – Rev B
3
© 2017 Telguard
The Telguard declares a no service condition (NSC) when the Telguard device is unable to register
with the cellular network.
NSC is programmable to trip the supervisory relay output (STC relay) after a variable period of
time. The STC LED will flash 4 times immediately after losing cellular service and independent of the
STC assertion and programmed assertion delay. NSC restoral occurs immediately after cellular
service has been acquired.
R
ADIO
C
OMMUNICATIONS
F
AILURE
C
ONDITION
(RFC)
Radio communications failure condition (RFC) is declared when the Telguard is unable to transmit
over the cellular network even with acceptable signal strength. When RFC is declared, the STC LED
will flash 5 times and the STC relay will trip as programmed. RFC is restored when communication
with the TCC is restored.
P
ANEL
P
RESENCE
F
AILURE
(PPF)
Panel presence failure condition (PPF) is declared when the Telguard is unable to detect the
presence of the alarm panel. PPF is indicated by the STC LED flashing 7 times. PPF is restored
immediately after the connection to the panel is restored and maintained for the delay period.
NOTE: The factory default for PPF is Disabled and needs to be Enabled for its use. In order
for the PPF feature to work, Tip, Ring, and the return connections for Tip and Ring must be
connected between the panel and the Telguard.
C
ONTROL
F
AILURE TO
C
OMMUNICATE
(CFC)
The Control Failure to Communicate (CFC) feature is an option that allows the Telguard unit to
monitor the number of communication attempts the alarm panel makes over Telco before the
Telguard becomes the main path of communication. This feature works by monitoring the alarm
panel from the time it goes off-hook, and attempts to communicate, to on-hook status, and comes off-
hook again. Each change in state by the alarm panel from off-hook to on-hook to off-hook again is
considered an attempt. If this continually happens for a specified number of times within a specific
time period, then the Telguard seizes the line and takes over as the main communication path for the
alarm panel. If the Telguard goes into CFC, then it will not allow the panel to communicate via Telco
again until the panel has been on-hook for 10 consecutive minutes.
Note that the CFC condition causes the Telguard unit to redirect communications to the cellular
channel, but it is not indicated on the STC LED, nor does it cause either of the external relays to be
tripped.
NOTE: The factory default for CFC is Disabled and needs to be Enabled for its use. When the
TG-4 is configured as a Cellular-Only solution, the CFC function is not applicable.
C
OMPLETE
P
OWER
S
UPERVISION
The Telguard supervises and reports status of the backup battery and AC power source. The
Telguard has an integrated control and power module which also keeps the Telguard battery charged
and performs a battery load test every 24 hours. This battery charger function is also supervised.
L
OW
/M
ISSING
B
ATTERY
C
ONDITION
(LBC)
The Telguard checks the backup battery voltage on initial power-up and every 60 seconds thereafter.
If the battery voltage is less than 11.6 volts, the battery state will change from ‘good’ to ‘bad’ leading
to declaration of an LBC whereby the STC LED blinks twice, and the STC relay trips. When the
