Siemens AC75 manual ME status indicated by status LED patterns

AC75 AT Command Set

19.7 AT^SSYNC

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19.7.1ME 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:	ME is in one of the following modes:
	- POWER DOWN mode	- POWER DOWN mode
	- AIRPLANE mode	- AIRPLANE mode
	- CHARGE ONLY mode	- CHARGE ONLY mode
	- NON-CYCLIC SLEEP mode
	- CYCLIC SLEEP mode with no tempo-
	rary wake-up event in progress 1)
600 ms on / 600ms off	Limited Network Service: No SIM card	Same as for AT^SSYNC=1
	inserted or no PIN entered, or network
	search in progress, or ongoing user
	authentication, or network login in
	progress.
75 ms on / 3 s off	IDLE mode: The mobile is registered to	Same as for AT^SSYNC=1
	the GSM network (monitoring control
	channels and user interactions). No call
	is in progress.
75 ms on / 75 ms off /	One or more GPRS PDP contexts acti-	Same as for AT^SSYNC=1
75 ms on / 3 s off	vated.
500 ms on / 50 ms off	Packet switched data transfer is in	Same as for AT^SSYNC=1
	progress.
Permanently on	Depending on type of call:	Same as for AT^SSYNC=1
	Voice call: Connected to remote party.
	Data call: Connected to remote party or
	exchange of parameters while setting
	up or disconnecting a call.
<n> ms on / <n> ms off 2)	Not possible: With AT^SSYNC=1, LED	SLEEP mode is activated (AT+CFUN
	signalization is disabled in SLEEP	parameter <fun> ≠ 1), but the ME is not
	mode.	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.

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