Справочник Пользователя для Sierra Wireless Q2438F

 WM_HWD_SK_UGD_002 - 002 

6/27/2003 

 

3.4 Audio 

There are two unique audio paths provided for on the Interface Board, and 

supported by the Module.   

3.4.1 Handset 

The Handset Jack (J300) supports fully differential microphone and speaker 

signals.  The microphone is also biased and filtered on the Interface Board.  
The Handset included in the Starter Kit can be used with this port.   

 

This Handset audio path is considered Path 1 in the AT Command Set. 

3.4.2 Headset 

The Headset Jack (J301) supports a biased differential microphone however 

the speaker path is either single or differential for GSM/GPRS or single ended 

only for CDMA.  This difference is due to limitations of the CDMA design, 

allowing for only one fully differential speaker path.  Jumpers on J303 
configure the path for single (SNGL) or differential (DIFF) audio.  The Handset 

included in the Starter Kit can be used with this port. 

 

There is an additional audio jack included on the Interface Board that supports 

the use of a standard 2.5mm three-wire cell phone headset (not included).  

This  jack  (J302)  supports  only  single ended microphone and speaker signals, 

and is wired in parallel with the Headset Jack, J301.  Only J301 or J302 can 

be used at once, and the jumpers on J303 must be set for single ended 
operation to use J302.  Note the single ended audio does result in an increased 

noise floor, especially when the Starter Kit is used with a GSM or GPRS 

Module.  Careful filtering and attention to layout is required in a customer 

application to minimize this noise. 

 

These Headset audio paths are considered Path 0 in the AT Command Set. 

3.5 RF 

There are two RF connection points on the Interface Board, both used to 

provide an RF path from the Module to the Interface Board mounted RF jack. 

 

The Module will be supplied with an RF “pigtail” cable assembly.  This pigtail 

is soldered to the module and terminates in a bulkhead style RF SMA 

connector.  This can be mounted on the Interface Board through the ground 
ring labeled “RF”, and the supplied Antenna screwed onto this connector.  This 

is the preferred method of connecting the RF Antenna. 

 

Alternatively, under the Module there are pads where an optional surface 

mount connector can be soldered that will mate with similar pads on the 

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