Quick-Reference

Configuration

Table A-1.

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

AT

Parameter &

 

Command

Option

Description

 

 

 

AT*FC2

=Lvl2

Lvl2 applies to V.32 (coded or uncoded)/V.32bis modulation modes only. It includes the Lvl1

 

 

function and shortens training time by approximately 2 seconds.

AT*FC3

=Lvl3

Lvl3 includes the Lvl1 and Lvl2 function and eliminates error-correction negotiation, saving

 

 

approximately an additional half second. For proper operation, enable this option and ensure

 

 

that AT*SM (Mode), AT*EC (Error Correction), and AT*DC (Data Compression) (EC/DC

 

 

OPT’S category) are set the same in both modems.

 

 

NOTE: Selecting Lvl3 in the V.34 modulation mode bypasses error correction negotiation and

 

 

improves the connect time of the modems as described above.

 

 

If your local and remote modems are configured for SDC operation by selecting Fast Call Lvl3,

 

 

the modems use LAPM error correction with V.42bis data compression only. For proper

 

 

operation, enable this option in both modems, and ensure that the AT*SM (Mode) is set the

 

 

same in both modems.

 

Flow

Flow Control

 

 

Allows the modems and DTEs in a link to control the flow of data when buffers near their

 

 

capacity. Use some type of flow control when operating in the Normal or Reliable mode.

 

 

Check the DTE’s manual to ensure that the DTE supports the type of flow control you select.

AT*FL0

=Off

Flow control is disabled.

AT*FLl

=XON/XOFF

The local modem and DTE operate flow control by passing characters embedded in the data

 

 

stream between them. The XOFF character signals the transmitting device to stop sending data.

 

 

The XON character lets the halted device start sending data. NOTE: XON/XOFF flow control

 

 

is not supported in SDC mode.

AT*FL2

=DTR/CTS

In asynchronous applications, the local modem and DTE use DTR/CTS signals to operate flow

 

 

control.

 

 

In SDC applications, DTR/CTS flow control operates the same as asynchronous applications,

 

 

except flow control is unidirectional from the local modem to the DTE through the CTS signal;

 

 

the modem uses CTS to signal when the buffers are full. The DTR signal has no impact on flow

 

 

control in synchronous applications.

AT*FL3

=RTS/CTS

In asynchronous applications, the local modem and DTE use RTS/CTS signals to operate flow

 

 

control. The terminal uses RTS to signal when its buffers are full. The modem uses CTS to

 

 

signal when its buffers are full. An on-to-off transition signals the transmitting device to stop

 

 

sending data; an off-to-on transition signals that data can flow.

 

 

In SDC applications, RTS/CTS flow control functions the same as asynchronous applications,

 

 

except flow control is unidirectional from the local modem to the DTE through the CTS signal;

 

 

the modem uses CTS to signal when the buffers are full. The RTS signal has no impact on flow

 

 

control in synchronous applications.

AT*FL4

=XON/XOFF PT

XON/XOFF Pass-Through Flow Control. The local modem and DTE operate flow control by

 

 

passing characters embedded in the data stream between them. Check your DTE manual to

 

 

verify if the DTE recognizes XON/XOFF flow control.

NOTES:

1)Pass-through flow control must be used with caution when Mode=Normal and Modem Flow=On because XON/XOFF characters are acted on by the remote modem at its DCE port.

2)Pass-through flow control is not applicable in 326X-SDCmode. If SDC is enabled, and you select XON/XOFF PT, the modem operates as if flow control were disabled.

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

A-20 Configuration Quick Reference

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Telenetics 326X V.34, V.34-SDC, V.32bis Series manual Flow Control

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

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