Information Technology Reference
In-Depth Information
Table17-1
Modem Cannot Send or Receive Data (continued)
Possible Causes
Suggested Actions
Hardware flow
control is not
configured on the
local or remote
modem or router
Use the show line aux-line-number exec command, and
look for the following in the Capabilities field (see the
section “Interpreting Show Line Output” in Chapter 16):
1.
Capabilities: Hardware Flowcontrol In, Hardware
Flowcontrol Out
If there is no mention of hardware flow control in this field,
hardware flow control is not enabled on the line. Hardware flow
control for access server-to-modem connections is
recommended.
For an explanation of the output of the show line command, see
the section “Using debug Commands,” earlier in this chapter.
2. Configure hardware flow control on the line using the
flowcontrol hardware line configuration command.
To set the method of data flow control between the terminal or
other serial device and the router, use the flowcontrol line
configuration command. Use the no form of this command to
disable flow control.
Syntax:
flowcontrol { none | software [ lock ][ in | out ]| hardware [ in |
out ]}
Syntax description:
none —Turns off flow control.
software —Sets software flow control. An optional keyword
specifies the direction: in causes the Cisco IOS software to
listen to flow control from the attached device, and out
causes the software to send flow control information to the
attached device. If you do not specify a direction, both are
assumed.
lock —Makes it impossible to turn off flow control from the
remote host when the connected device needs software flow
control. This option applies to connections using the Telnet
or rlogin protocols.
hardware —Sets hardware flow control. An optional
keyword specifies the direction: in causes the software to
listen to flow control from the attached device, and out
causes the software to send flow control information to the
attached device. If you do not specify a direction, both are
assumed. For more information about hardware flow
control, see the hardware manual that was shipped with your
router.
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