Specifications

Chapter 17 – Hardware-Related Commands
Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 281
LED Behavior ME operating status if AT^SSYNC=1 ME operating status if AT^SSYNC=2
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
2)
Not possible: With AT^SSYNC=1, LED
signal 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 available.
25 ms on / 4 * <n> ms
off
2)
Not possible: With AT^SSYNC=1, LED
signalization is disabled in SLEEP
mode.
SLEEP mode is activated (AT+CFUN
parameter <fun> ≠ 1) while the ME is
registered to the GSM network and in
IDLE mode.
25 ms on / <m> ms off /
25 ms on / 3 * <m> ms
off
2)
Not possible: With AT^SSYNC=1, LED
signalization (what is meant here?) is
disabled in SLEEP mode.
SLEEP mode is activated (AT+CFUN
parameter <fun> ≠ 1) while the ME is
registered to the GSM network.
Additionally, PDP context is activated.
1)
When a temporary wake-up event (for example a call, a URC, a packet switched transfer) occurs in CYCLIC
SLEEP mode the LED flashes according to the patterns listed above. See Section 2.9.1, Wake up the ME from
SLEEP mode for details on the various SLEEP modes and wake-up events.
2)
The duration of <n> and <m> depends on the network: In SLEEP mode, the module can only change its LED
status during intermittent wake-up periods when listening to paging information from the base station. Therefore
the values of <n> and <m> vary as follows:
<n> = value from 471 ms to 2118 ms
<m> = 3000 ms