Specifications

Chapter 8. Command Reference 305
03/09/1998-17:15:35:DOD: link to co over ATM-VC/1 is now up
03/09/1998-17:15:57:SDSL: Line Rate at last activation saved
Autobaud pre-activation
The previous section showed an example in which auto-speed detection attempted several speeds, before
settling on the best speed for the connection. In some cases, this process can require substantial time. The
autobaud feature, if available for your router and DSLAM, can shorten the connection set-up time by
determining the probable optimal speed before the connection begins.
If the autobaud feature is available and selected, its pre-activation phase automatically determines the
maximum speed that can be supported by a specific loop. It probes the channel and characterizes the line to
allow the connection to begin at a speed closer to the optimal speed.
Later, after activation, the autobaud feature checks the line quality to determine the optimal speed. If the
autobaud feature is used, the auto-speed detection described in the previous section is not performed;
however, you may still set the speed manually with an sdsl speed command if you wish.
A command is available to turn off autobaud pre-activation (sdsl preact off, page 305). A message is sent
before line activation indicating whether autobaud pre-activation was used. The following example shows the
message sent when pre-activation is available and the response to the sdsl speed command:
08/16/2000-16:11:06:SDSL: Using preactivation-determined rate of 2320 Kb/s
08/16/2000-16:11:06:SDSL: CPE is Activating at 2320 Kb/s
08/16/2000-16:11:20:SDSL: Activated at 2320 Kb/s
08/16/2000-16:11:20:FRAMER: The framer is synchronized
# sdsl speed
SDSL Current Speed (CO-controlled): 2320 Kb/s
The next example shows the message sent when pre-activation is not available:
08/16/2000-16:13:28:SDSL: Preactivation unavailable, using rate of 2320 Kb/s
08/16/2000-16:13:28:SDSL: CPE is Activating at 2320 Kb/s
08/16/2000-16:13:41:SDSL: Activated at 2320 Kb/s
08/16/2000-16:13:42:FRAMER: The framer is synchronized
SDSL ?
Lists the supported keywords for the sdsl command.
Example:
# sdsl ?
SDSL commands:
? help speed
save stats terminal
SDSL PREACT
Displays and/or changes the autobaud pre-activation status.
sdsl ?