Siemens Mux_guide_v06 사용자 설명서

Multiplexer User's Guide 
Confidential / Released 

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Mux_guide_v06 

Page 10 of 36 

30.06.2004 

Please note that a cellular engine designed for multiplex operation does not include three 
different devices. Only one single air interface (RF part) is available.  
 
As mentioned before the multiplexer enables one serial interface to run three sessions 
simultaneously. All incoming or outgoing calls are connected to the device.  
Channel 1 supports the full range of functions, which is available without multiplexer tool. 
Channel 2 and 3 are connected to a different AT interpreter and support a subset of the 
functional range of channel 1, for more details refer to Table 1.  
 

Table 1: Comparison of multiplexer channels 

 

Voice calls 
incoming 
outgoing

 

Data / fax calls
incoming 
outgoing

 

SMS 
incoming 
outgoing

 

GPRS 
connection 
 

Phonebook 
management 

AT 
commands 

Channel 1 

!

 

!

 

!

 

!

2)

 

!

 

!

 

Channel 2, 3 

!

 

!

 

!

2)

 

!

 

  !

1)

 

 

!

  indicates that the functionality is available on the channel 

---  indicates that the functionality is not available on the channel

 

1)

 

except for AT commands related to data and fax calls

 

2) 

only two channels can be used parallel to transmit GPRS data 

 

 
 
 

Examples 
•  While a data call is in progress on channel 1, you can send a short message on channel 

2 and edit the phonebook on channel 3.  

•  When receiving a fax on channel 1, you are able to check the battery capacity using the 

appropriate AT command on channel 2 or 3. 

 
 
Note 
Due to the technical requirements of multiplexer mode, data and fax calls can only be set up 
on logical channel 1 while GPRS connections can be established on every channel. Several 
AT commands have a different behavior on channels 2 and 3. Additional information 
regarding restrictions and interferences between the channels can be found in chapter 3.1 
and in [2].