Automatic Rate Adaption - Motorola V.3400 User Manual

AT Commands
Automatic Rate Adaption %R
Automatic rate adaption (ARA) allows the modem to automatically
decrease the DCE rate when the allowable bit error rate is exceeded. If
condition improves the modem automatically increases the rate.
Select this feature by front panel operation or AT command. Options
include disabled (factory default), low (BER= 1 in 10
(BER= 1 in 10
The following apply to automatic rate adaption:
• Automatic rate adaption is disabled during direct mode.
• Manual rate adaption is disabled from the front panel when
automatic rate adaption is enabled.
• Only one increment or decrement in the DTE rate is allowed at a
time during rate adaption from the initiating modem.
• When online, initiator rate adaption occurs a maximum of every
12 to 14 seconds from the last occurrence of a rate adaption.
• After the modem drops data rate because of poor signal quality,
the line must improve by approximately 2.5 dB before an
increase in rate can occur.
Note
Automatic rate adaption is disabled during direct mode.
If automatic rate adaption is enabled, the modem automatically
decreases DCE rate if signal quality deteriorates beyond the allowable
bit error rate. If signal quality improves, the modem increases DCE
speed.
Command
%R
%R1
%R2
%R3
* default
5-30
4
), high (BER= 1 in 10
Disable automatic rate adaption *
Enable automatic rate adaption using low BER: 1 in 10
Enable automatic rate adaption using medium BER: 1 in 10
Enable automatic rate adaption using high BER: 1 in 10
3
).
Operation
V.3400
5
), medium
5
4
3