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Installation, Maintenance and Operation Manual V24a (June 2012)
British Telecommunications plc 2012
Signal Strength Test
LEDs SS1 and SS2 provide a signal strength indication. Signal strength is indicated as shown in
Figure 15
SS2
SS1
Signal Strength
Quality
Off
Off
No reading available
(e.g. modem is being reset
or attempting to register)
or
<-89dBm
Unacceptable
Off
FLASH -89dBm to -83dBm
Borderline
Off
On
-83dBm to –77dbm
Good
FLASH
On
-77dBm to -69dBm
Very Good
On
On
> -69dBm
Excellent
Figure 15 - Signal Strength LED indications
Roaming SIM option
Secure units with software versions K20P60A20P62 and above will support a Redcare
Roaming SIM.
A roaming SIM will allow the unit to connect to another GPRS network under the following
conditions.
Failure of registration with the current cell base
Failure of receipt of an expected routine GPRS poll from Redcare’s ESP within the
expected time.
Failure of acknowledgement to a new alarm
A unit with a roaming SIM will look for a GPRS network with better than -75dB signal strength at start up.
Signal strength LED (SS1) with briefly flutter each time the unit attempts to roam to another network.