
LEDS, CONNECTORS, AND SPECIFICATIONS
MultiModem
®
iCell MTCMR User Guide
11
Chapter 3 – LEDs, Connectors, and Specifications
Front
MTCMR-E1, -G2, -H5
MTCMR-C1, -C2, -EV2, -EV3
LEDs
LED
Description
TD
Transmit Data:
Lights when device transmits data. Not valid while in USB mode.
RD
Receive Data:
Lights when device receives data. Not valid while in USB mode.
CD
Carrier Detect:
Lights when there is a data connection. Not valid while in USB mode.
LS
Link Status:
LED behavior depends on model.
H5, C2, EV3, and EV2
models
G2 and C1 models
E1 model
Note:
Set AT^SSYNC to 1 for
the following default LED
timings:
Continuous ON indicates
device is powered on and
registered on the network.
Continuous ON indicates
device is not registered on the
network.
Continuous ON indicates connected to
remote party (CSD call).
Slow flashing (5 seconds)
indicates device is on and
searching for a network.
Flashing at 200 ms on / 2 sec
indicates registration on
network.
Flashing at 600 ms on/600 ms off
is
limited network service: No SIM card
inserted or no PIN entered, or network
search in progress or ongoing user
authentication, or network login in
progress.
Fast flashing (0.3 seconds)
indicates device is
transmitting or receiving.
Flashing at 200 ms on / 600
ms off indicates it is registered
on a network and
communication is in progress.
Flashing at 75 ms on/3 sec off
is idle
mode: Registered to the GSM network
(monitoring control channels and user
interactions). No call is in progress.
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