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User's Manual V34bis Fax-modem - AJ 2885 P

AJ 2885 P - Pa

e 28

CONFIGURATION PARAMETER (38,400 BPS) CONNECTION RESULT

Autobaud Async / Sync Mode DCE sped DCE speed DTE speed

@A1 : ON &M1 : Sync Do not care Do not care 33600 33600 (1)

@A2 : DTE

@A0 : OFF

&M1 : Sync Do not care @M15: 28800 28800 28800 (1)

@A1 : ON &M0 : Async *M1 : normal

*M2 : auto

*M3 :

exclusive

Do not care 33600 38400 (2)

@A1 : ON &M0 : Async *M0 : direct Do not care 33600 33600 (3)

@A2 : DTE

@A0 : OFF

&M0 : Async *M1 : normal

*M2 : auto

*M3 :

exclusive

@M4 : 9600 9600 38400 (4)

@A2 : DTE

@A0 : OFF

&M0 : Async *M0 : direct @M4 : 9600 9600 9600 (5)

Remark :

(1) The synchronous mode parameter &M1 is dominating : DTE speed depends on the

connection speed. It may also vary during connection in case of retrain or fall back

negotiated with the remote modem for example.

(2) Except for direct mode (*M0), Autobauding (@A1) is dominating : DCE speed

depends on the terminal DTE speed. The default factory configuration is based on

this configuration.

(3) Direct mode parameter (*M0) is dominating : DTE speed change to the DCE speed

upon connection. Any speed change should be avoided in asynchronous mode since

the DTE terminal could not adapt to any further speed change.

(4) Autobauding is either limited to the DTE speed detection (@A2) or disabled (@A0) :

DCE connection speed can be set up independently thanks to the @M parameter.

DTE terminal speed remains unchanged in asynchronous mode (constant DTE

speed).

(5) Again Autobauding is either limited to the DTE speed detection (@A2) or disabled

(@A0) : the @M parameter sets the DCE connection speed independently from the

DTE speed. But, DTE terminal speed becomes the DCE speed upon connection

because of direct mode (*M0). Again, any speed change should be avoided in

asynchronous mode since the DTE terminal could not adapt to any further speed

change.

5.3. Rate and connection mode selection

The AJ 2885 provides several solutions to determine the mode of connection.

 Selecting connection mode for speeds of 2400 to 19200 BPS

: the modem can connect

these speeds in V34 mode or in older V22, V22Bis, V32Bis or V32 is modes. The AT

@OM command selects the wanted mode of connection This command should be left as

@OM3 for automatic mode adaptation since the V34 mode is designed to recognise V32 /

V32Bis remote modems during the handshake.

 Autobaud

: the modem recognises automatically the speed and the data format of the

terminal when it sends an AT command. If the 'full' autobaud is active - AT @A1 - then the

modem will adapt the connection rate to the nearest lower connection speed. This is the

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