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AC75 AT Command Set

19.7 AT^SSYNC

AC75_ATC_V01.002 Page 494 of 569 10/30/06

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19.7.1 ME status indicated by status LED patterns

The following table lists the possible patterns of status LED behavior, and describes the ME operating status indi-

cated by each pattern if AT^SSYNC parameter <mode>=1 and <mode>=2. To better monitor the operating states

while power saving is enabled, we recommend that priority be given to <mode>=2.

During the transition from one LED pattern to another the "on" and/or "off" periods of the LED may vary in length.

This is because an event that triggers the change may occur any time and, thus, truncate the current LED pattern

at any point.

The statements on LED behavior during SLEEP mode are not applicable if the USB cable is plugged. This is

because power saving with connected USB host does not take effect if set with AT+CFUN only. For details see

notes provided with AT+CFUN. Therefore, while the USB cable is plugged, the LED is always on and flashes as

if the module works at AT+CFUN=1, no matter whether AT^SSYNC=1 or AT^SSYNC=2 is enabled.

Table 19.1: Modes of the LED and indicated ME functions

LED behavior ME operating status if AT^SSYNC=1 ME operating status if AT^SSYNC=2

Permanently off ME is in one of the following modes:

- POWER DOWN mode

- AIRPLANE mode

- CHARGE ONLY mode

- NON-CYCLIC SLEEP mode

- CYCLIC SLEEP mode with no tempo-

rary wake-up event in progress

ME is in one of the following modes:

- POWER DOWN mode

- AIRPLANE mode

- CHARGE ONLY mode

600 ms on / 600ms off 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.

Same as for AT^SSYNC=1

75 ms on / 3 s off IDLE mode: The mobile is registered to

the GSM network (monitoring control

channels and user interactions). No call

is in progress.

Same as for AT^SSYNC=1

75 ms on / 75 ms off /

75 ms on / 3 s off

One or more GPRS PDP contexts acti-

vated.

Same as for AT^SSYNC=1

500 ms on / 50 ms off Packet switched data transfer is in

progress.

Same as for AT^SSYNC=1

Permanently on Depending on type of call:

Voice call: Connected to remote party.

Data call: Connected to remote party or

exchange of parameters while setting

up or disconnecting a call.

Same as for AT^SSYNC=1

<n> ms on / <n> ms off

Not possible: With AT^SSYNC=1, LED

signalization is disabled in SLEEP

mode.

SLEEP mode is activated (AT+CFUN

parameter <fun> ≠ 1), but the ME is not

registered to the GSM network (e.g. SIM

not inserted or PIN not entered, and

therefore, either no network service or

only Limited Network Service is avail-

able.

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