Multi-Tech MultiModem EDGE Reference Manual page 260

LED Behavior
<n> ms on / <n> ms off
2)
25 ms on / 4 * <n> ms
2)
off
25 ms on / <m> ms off /
25 ms on / 3 * <m> ms
2)
off
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
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371G)
ME operating status if AT^SSYNC=1
Not possible: With AT^SSYNC=1, LED
signal is disabled in SLEEP mode.
Not possible: With AT^SSYNC=1, LED
signalization is disabled in SLEEP
mode.
Not possible: With AT^SSYNC=1, LED
signalization is disabled in SLEEP
mode.
Chapter 17 – Hardware-Related Commands
ME operating status if AT^SSYNC=2
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.
SLEEP mode is activated (AT+CFUN
parameter <fun> ≠ 1) while the ME is
registered to the GSM network.
SLEEP mode is activated (AT+CFUN
parameter <fun> ≠ 1) while the ME is
registered to the GSM network.
Additionally, PDP context is activated.
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