Quick-Reference

Configuration

Table A-1.

AT Commands, Cross-Referenced to Front Panel Options (Continued)

AT

Parameter &

 

Command

Option

Description

 

 

 

AT*AP1

=On

The modem monitors telephone line signal quality and negotiates the highest possible rate for a

 

 

modem’s modulation mode. You must enable Retrain (AT*RT) to use the Adaptive Rate.

 

 

Close rear panel switch 1 down so that the modem can inform the terminal of rate changes See

 

 

“Configuring the Modem’s Dual In-line Package (DIP) Switches” section in this appendix for

 

 

information.

 

 

Adaptive Rate Operation in V.34 Modulation Mode

 

 

In the V.34 modulation mode, with Adaptive Rate=On (MODULATION OPTS Menu, or

 

 

AT*AP1), the modem selects the optimum data rate on the first connection. The modem then

 

 

monitors line conditions, and if conditions deteriorate (i.e., poor signal quality), the modems

 

 

retrain and determine the rate that the line can support, within the range specified in Max Rate

 

 

(AT*MX) and Min Rate (AT*MN). Under poor line conditions, the modem may fall back by

 

 

more than one rate.

 

 

For example, at a data rate of 28.8 kbps, under poor line conditions, the modem may retrain to

 

 

19.2 kbps instead of 21.6 kbps. ARS adjustment is based on the High/Low BER setting of the

 

 

AT*RT (Retrain) option.

 

 

NOTES:

 

 

1) The AT*RT (Retrain) command must be enabled (set to Low BER or High BER)

 

 

if you use the adaptive rate setting.

 

 

2) The modem does not fall forward in V.34 modulation mode with ARS enabled.

 

 

 

 

 

Line Probing Feature Operation in V.34 Mode

 

 

The modem uses a line probing feature during the initial training sequence. Line probing

 

 

selects the maximum data rate that the line can support, as well as the optimal baud rate and

 

 

carrier frequency. Due to this, in the V.34 modulation modes (V.34 Auto and V.34 Only), the

 

 

modem may require a longer training sequence.

 

 

NOTE: For a summary of the supported data rates, baud rates and carrier frequencies, refer to

 

 

the “V.34 Modulation Mode Characteristics” section in Chapter 1.

 

 

 

 

 

If You Operate the Modem in V.34 Mode with ARS Disabled...

 

 

If you operate the modem in the V.34 modulation mode with the ARS option disabled

 

 

(AT*AP0), the modem selects the optimum data rate that can be supported (as determined by

 

 

the line probing feature described above) on the first connection.

 

 

With ARS disabled, the modem does not automatically fall back when line conditions

 

 

deteriorate.

 

 

NOTE: When external timing is selected, configure the modem so that the minimum rate is

 

 

equal to the maximum rate. This will force the modems to come up at a specific data rate only.

 

 

 

 

Asym Rate

V.34 Asymmetric Rate

 

 

Controls whether the modem permits different transmit and receive DCE rates.

AT*AR0

=Off

Asymmetric Rate

AT*AR1

=On

 

 

Ans Rest

Answer In Restoral

 

 

Controls whether the modem answers a call on the dial line while connected to the leased line.

AT*AS0

=LL Fail

When connected on a leased line, the modem answers an incoming call only if the leased line

 

 

fails.

Gray shading indicates country-specific options. See Appendix C for your country’s options.

A-14 Configuration Quick Reference

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Telenetics 326X V.34, V.34-SDC, V.32bis Series manual Asym Rate, Ans Rest
Page 129 Page 131

326X V.34, V.32bis Series, V.34-SDC specifications

Telenetics has been a key player in the field of telecommunications, offering advanced modem solutions that cater to diverse communication needs. Among their notable products are the V.34-SDC and V.32bis series, including the 326X V.34 modem. These modems have been designed to enhance data transmission reliability and speed in various applications.

The Telenetics V.34-SDC modem represents a significant leap in technology, supporting data rates of up to 28.8 Kbps. This modem utilizes the advanced V.34 modulation scheme, which optimizes the use of existing telephone lines to deliver impressive performance, especially for users requiring high-speed data transmission. The V.34-SDC model also features robust error correction and data compression techniques, ensuring that users receive accurate data even over less than ideal connections. With its extended line-conditioning capabilities, the V.34-SDC modem can efficiently handle long distances and poor line conditions.

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The 326X V.34 modem further exemplifies Telenetics' commitment to high performance. It combines the V.34 capabilities with enhanced security features, offering users encryption options for sensitive data. This is particularly crucial for businesses that need to safeguard their information against potential vulnerabilities during transmission. The 326X also supports various data communication protocols, making it adaptable for multiple platforms and applications.

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