Product Info

LTE Standard Module Series
EC21_Series_Mini_PCIe_Hardware_Design
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Figure 13: LED_WWAN# Signal Reference Circuit Diagram
There are two indication modes for LED_WWAN# signal to indicate network status, which can be
switched through following AT commands:
 AT+QCFG="ledmode",0 (Default setting)
 AT+QCFG="ledmode",2
The following tables show the detailed network status indications of the LED_WWAN# signal.
Table 15: Indications of Network Status (AT+QCFG="ledmode",0, Default Setting)
Pin Status Description
Flicker slowly (200 ms Low/1800 ms High) Network searching
Flicker slowly (1800 ms Low/200 ms High) Idle
Flicker quickly (125 ms Low/125 ms High) Data transfer is ongoing
Always Low Voice calling
Table 16: Indications of Network Status (AT+QCFG="ledmode",2)
Pin Status Description
Low Level (Light ON) Registered on network successfully
High-Impedance (Light OFF)
 No network coverage or not registered
 W_DISABLE# signal is at low level. (Disable the RF)
 AT+CFUN=0, AT+CFUN=4 input
3.10.6. WAKE#
The WAKE# signal is an open collector signal which is similar to RI signal, but a pull-up resistor and
AT+QCFG="risignaltype","physical" are required. When a URC returns, a 120 ms low level pulse will
be outputted. The state of WAKE# signal is shown as below.