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P a g e
4.7.3.1 FM 36xxi 2G Modem
(Viewed from the front unit: LED to the right, below the GSM RF connector for external antenna)
GSM does not have any reception: No SIM
card inserted or no PIN entered, or network
search
in
progress
or
ongoing
user
authentication or network login in progress
No beeps
600 ms ON / 600 ms OFF
Idle mode: The GSM is registered to the GSM
network (monitoring control channels and user
interactions). No call in progress
No beeps
75 ms ON / 3 s OFF
GPRS: Unit is registered to network and
capable of connecting via GPRS.
No beeps
75 ms ON / OFF/ 75 ms ON/ 3 s
OFF
Packet switched data in progress
No beeps
500 ms ON / 50 ms OFF
4.7.3.2 FM 37xxi/FM 38xxi 3G Modem
(Viewed from the front unit: LED to the right, below the GSM RF connector for external antenna)
Limited Network Service (e.g. because no
SIM/USIM, no PIN or during network search)
No beeps
500 ms ON / 500 ms OFF
GSM CS data call in progress or established
GSM voice call in progress or established
UMTS voice call in progress or established
UMTS CS data call in progress
No beeps
10 ms ON / 990 ms OFF
UE registered to a network. No call, no data
transfer
No beeps
10 ms ON / 3990 ms OFF
GSM PS data transfer
UMTS data transfer
No beeps
10 ms ON / 1990 ms OFF