3.4Operating States/LED

The modem has a green LED, as depicted below, which is used to indicate various operating states. These states are described in following table.

Operating State

LED Status

 

 

After switching on the modem

On after 4 s

 

 

Switch off (Power down) or power removed

Off

 

 

Standby or talk

Flashing

 

 

No network, network search, no SIM card, no PIN

On

entered

 

 

 

Switch off (Power Down): DC power is applied but the modem is switched OFF.

Standby: The TT4031 (SE-GM29) is switched ON and camped on to the network. No call in progress.

Talk: The TT4031 (SE-GM29) is switched ON and a voice/data call is in progress.

Owner’s Manual

Rev 1.0

Page 38 of 38