In the following table, “protocol” means error correction and data compression. Note that the first two lines in the table are likely to be the most valuable.

Note 1: In the command strings shown in the table that follows, the character 0 is zero, not the letter “O.”

To force the different communication speeds

Type these commands and

 

press Enter

Negotiate speed and protocol

AT &F

(default setting)

 

Negotiate speed only, no protocol (not recom-

AT \N0

mended)

 

To force protocol

AT \N3

To force the different communication speeds

Type these commands and

(i.e., maximum possible speed; actual speed

press Enter

depends on line conditions and other factors)

 

Connect at 56000 bps (V.90)

AT +MS=V90,0

Connect at 56000 bps (K56flex)

AT +MS=K56,0

Connect at 33600 bps (V.34)

AT +MS=V34

Connect at 14400 bps (V.32bis)

AT +MS=V32B

Connect at 9600 bps (V.32)

AT +MS=V32

Note 2: You may find it helpful to include S95=44 in your initialization string. This enables the responses CARRIER (telephone line speed) and PROTOCOL, as well as CONNECT (faxmodem-to-computer speed).

Note 3: Some software allows these commands to be added to the list of dial prefixes.

There are other configurations that can be forced as well. If you need to select a particular configuration, use the AT command strings shown below. You can always return to the modem’s default configuration by typing AT &F and pressing the Enter key. Remember that if you do this, the modem will not have received the commands in your soft- ware’s initialization string as it normally would. Using the ATZ command overcomes this problem if you have saved all of your setup parameters in nonvolatile memory. (To save setup parameters in nonvolatile memory in AT termi- nal mode: Type AT, followed by the parameter settings you choose, followed by &W, and press Enter. For example, if you type AT &C1 &D2 &W and press Enter, the &C1 and

Chapter 4 Problems and Solutions

25

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Zoom 1120, 2925 quick start AT +MS=V32B
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1120, 2925 specifications

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