
Reference Guide for the Model XM128 ISDN Digital Modem
Conventional dialing commands ATD, ATDT, and ATDP, used by much of the existing communication software, can be mapped onto one of the new dialing commands according to the AT&O setting as shown in Table
Table | Dialing commands |
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AT Command | Dial string it maps to |
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AT&O0 | ATD, ATDT, and ATDP are the same as ATDB. |
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AT&O2 | ATD, ATDT, and ATDP are the same as ATDI. |
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AT&O3 | ATD, ATDT, and ATDP are the same as ATDA. |
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The factory default is AT&O2, which means that the Model XM128 modem selects ISDN data mode when you do not specify the communication mode to use (that is, ATD or ATDT).
Placing the Call
To initiate a call, choose the proper communication mode and configure the mode according to the bearer service (or protocol) you want to use. Table
Table | Call placing commands |
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Command | Description |
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ATBnn | Changes ISDN B channel protocol setting |
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ATDL | Redials the last dialed telephone number |
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ISDN Overview |