Elster A1140 User Manual page 88

15
Communications
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LED Status Indicators
The ASL modem has three status LED's
Modem Status (Green LED)
Slow flash (once every 3 seconds) CDS mode (waiting for call)
Fast flash (twice a second) during call
Network status (Red LED)
Off (module off)
On (Not registered)
Long pauses, short blinks (Registered with network)
Signal strength (Yellow LED)
Off/ Slow flash/ On (with increasing signal levels)
(The more 'on time' the better the signal)