User's Manual

4
Rev 1.1 Mar.06 17
4: Host/Module Communication
Interface
ThischapterprovidesinformationabouttheHost‐Module
communicationinterface(USBinterface)andlistsofextended
ATcommandsthatmaybeusefulforhardwareintegration
testing.
Note: On any given interface (USB, USIM/RUIM, etc.), leave unused
inputs and outputs as no-connects.
LED output
ThemoduledrivestheLEDoutputaccordingtothePCI‐
ExpressMiniCardspecification(summarizedinTable 4‐1,
below).
Table 4-1: LED States
State Indicates Characteristics
OFF
Module is not
powered.
Light is turned off.
ON
Module is powered
and connected, but
not transmitting or
receiving.
Light is turned on.
Slow Blink
Module is powered
and searching for a
connection.
LED is flashing at a steady,
slow rate.
• 250 ms ± 25% ON period
• 0.2 Hz ± 25% blink rate
Intermittent
Blink
Module is transmitting
or receiving.
LED is flashing
intermittently, proportional to
activity on the interface.
• 50% duty cycle
• 3 Hz minimum blink rate
• 20 Hz maximum blink
rate