Information Technology Reference
In-Depth Information
Table17-3
Dialup Sessions Sees “Garbage”
Possible Causes
Suggested Actions
Modem speed
setting is not
locked
1.
Use the
show line
exec command on the access server or
router. The output for the auxiliary port should indicate the
currently configured Tx and Rx speeds.
2.
If the line is not configured to the correct speed, use the
speed
line configuration command to set the line speed on the
access server or router line. Set the value to the highest speed
in common between the modem and the access server or
router port.
To set the terminal baud rate, use the
speed
line configuration
command. This command sets both the transmit (to terminal) and
receive (from terminal) speeds.
Syntax:
speed
bps
Syntax description:
•
bps
—Baud rate in bits per second (bps). The default is 9600
bps.
Example:
The following example sets lines 1 and 2 on a Cisco 2509 access
server to 115200 bps:
line 1 2
speed 115200
If you cannot use flow control
for some reason, limit the line
speed to 9600 bps. Faster
speeds likely will result in
lost data.
Note
3.
Use the
show line
exec command again, and confirm that the
line speed is set to the desired value.
4.
When you are certain that the access server or router line is
configured for the desired speed, initiate a reverse Telnet
session to the modem via that line. For more information, see
the section “Establishing a Reverse Telnet Session to a
Modem,” earlier in this chapter.
5.
Use a modem command string that includes the lock DTE
speed command for your modem. See your modem
documentation for exact configuration command syntax.
Note:
The
lock
DTE speed command, which might also be
referred to as
port rate adjust
or
buffered mode
, is often related to
the way in which the modem handles error correction. This
command varies widely from one modem to another.
