July 2013 © British Telecommunications plc 2013
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The unit sends a “Unit Restarted” event (pin 984,1) over the first available path, followed by a
“Unit restarted” restore (pin 984,3) within 2 seconds. The unit also sends the state of all 16
pins and the state of the PSTN voltage alarm and low Battery alarm. Sending these alarm
states at start up help to ensure that the ARC alarm handling software reflects the true state of
all pin alarms after start up.
Status displays
The unit clearly displays its status on the 2 X 7 segment LEDs. An additional green LED is
provided at the side of the Ethernet connector to indicate packet flow on Ethernet.
In its normal working state, the unit will cycle displaying the signal strength (SS), pins in alarm
state (AL) and Grade of service (Gd) in 1s steps. i.e. It will show “SS” followed by the received
wireless signal strength from 0 – 31. The display may also occasionally display 99 as the
signal strength if the unit’s Cinterion wireless modem is unable to determine the current signal
strength. For reliable GPRS operation the signal strength should be at least SS-12, or higher.
After the signal strength is displayed for 1s, the unit will then show “AL” followed by any alarm
inputs 1-16 that are currently in the alarm state. If no pins are in the alarm state, then it will
show AL followed by 00. The unit may also show Lb (low battery) if the supply voltage is below
the supply threshold, and t1 or t2 if test modes t1 or t2 are active.
After the alarms status is displayed for 1s, the unit will then show “Gd” followed by the Grade
of service i.e. Gd-04 for Secure IP, or Gd-02 for Secure 2 etc. The Grade of service can only
be determined by the unit while in contact with the ESP. The unit will not show Gd until at least
one path is commissioned and the polling rates can be retrieved from the ESP. The unit may
show Gd followed by - - if the polling parameters cannot be determined.
