System information

Troubleshooting Dialin Connections
Book Title
16-356
Flow control is not enabled, is
enabled only on one device (either
DTE or DCE), or is misconfigured
Step 2 Configure hardware flow control on the line using the flowcontrol
hardware line configuration command.
Example:
The following example sets hardware flow control on line 7:
line 7
flowcontrol hardware
Note: If for some reason you cannot use flow control, limit the line
speed to 9600 bps. Faster speeds are likely to result in lost data.
Step 3 After enabling hardware flow control on the access server or router
line, 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.
Step 4 Use a modem command string that includes the RTS/CTS Flow
command for your modem. This command ensures that the modem
is using the same method of flow control (that is, hardware flow
control) as the Cisco access server or router. See your modem
documentation for exact configuration command syntax. Figure 16-1
shows the hardware flow control command string for a
Hayes-compatible modem.
Modem speed setting is not locked
Step 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.
For an explanation of the output of the show line command, see the
“Using debug Commands” section earlier in this chapter.
Modem speed setting is not locked
Step 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
Note: If for some reason you cannot use flow control, limit the line
speed to 9600 bps. Faster speeds are likely to result in lost data.
Step 3 Use the show line exec command again and confirm that the line
speed is set to the desired value.
Step 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.
Possible Causes Suggested Actions