T61 Smart Modem
Page 15 of 47
User Guide V1.4
4.5
Status LED
T61 Smart Modem has one red LED indicating the device and network status. When the device
detects no SIM card inserted or no antenna or not yet connected to network, the LED will blink fast
at approximately every one second. The detail “ON/OFF” timing of the LED is presented in the
following table.
LED mode
Operating status of T61
Permanently OFF
T61 is not powered on
Permanently ON
T61 is in Configuration
30ms ON/470ms OFF
During data transfer
30ms ON/3970ms OFF
Registered to a network. No data transfer
500ms ON/500ms OFF
Limited Network Services/ Network not registered/ (e.g. because no
SIM/USIM, no PIN or during network search)
4.6
Antenna Interface
An external antenna is connected via the T61’s female SMA connector (shown in Figure 6).
Figure 6: Antenna Interface
