Cisco Cisco 3600 Series 12-Port Digital Modem Network Module Technisches Handbuch
Configure Modems Using modem autoconfigure
This section describes how to apply a new modemcap to an integrated modem. A modemcap is a database of
setup strings that is used by the modem autoconfigure function to change a modem's default settings. The
modemcap is configured using the modem autoconfigure command.
setup strings that is used by the modem autoconfigure function to change a modem's default settings. The
modemcap is configured using the modem autoconfigure command.
For more information on the application of modemcaps refer to the document Modem Management
Operations.
Operations.
Keep the following rules in mind:
Do not use the modem autoconfigure discovery command.
•
If using the modem autoconfigure command, remove any commands under the line configuration
section for script reset and script startup. These commands are redundant and have been harmful in
some cases.
section for script reset and script startup. These commands are redundant and have been harmful in
some cases.
•
When writing a modemcap, ignore the descriptive fields seen in show modemcap. Put the modem
initialization string you want into the miscellaneous (MSC) field of the modemcap.
initialization string you want into the miscellaneous (MSC) field of the modemcap.
•
Always start the initialization string with &F (for non−Cisco modems, start with the preferred &F1,
&F2, as appropiate).
&F2, as appropiate).
•
Never put &W into an initialization string. On modems where &W is not a no op (that is, a statement
or operation that does nothing), this can wear out the erasable programmable read−only memory
(EPROM).
or operation that does nothing), this can wear out the erasable programmable read−only memory
(EPROM).
•
With MICA modems, use &F&D2, unless you have specific setting you wish to adjust.
•
Always use the modem autoconfigure type modemcap−name command (in line configuration mode)
to apply the modemcap to the modems.
to apply the modemcap to the modems.
•
If you want the modems to use the default configuration, use the modem autoconfigure type mica
command, regardless of the kind of modem, to reset the modem to factory defaults (&F).
command, regardless of the kind of modem, to reset the modem to factory defaults (&F).
•
All modems (internal, external, and so on) are susceptible to denial of service problems if Reverse
Telnet is allowed and a modemcap is not configured. Therefore, always specify a modemcap.
Telnet is allowed and a modemcap is not configured. Therefore, always specify a modemcap.
•
Create and Apply the Modemcap
The following section demonstrates how to configure and apply a simple modemcap:
maui−nas−02#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
maui−nas−02(config)#modemcap edit MY_MODEMCAP miscellaneous &F&D2
! −−− In this example the modemcap name selected is MY_MODEMCAP
! −−− The miscellaneous field is used to input the initialization string &F&D2
maui−nas−02(config)#line 1 192
maui−nas−02(config−line)#modem autoconfigure type MY_MODEMCAP
! −−− Apply the modemcap (named MY_MODEMCAP) to the modems in line configuration mode
Tip: Activate the debug confmodem command (prior to applying the modemcap) to see the initialization
string being applied to the individual modems. Note that for devices with a large number of modems this may
take a while and generate numerous console messages. An example is shown below:
string being applied to the individual modems. Note that for devices with a large number of modems this may
take a while and generate numerous console messages. An example is shown below:
maui−nas−02#debug confmodem
Modem Configuration Database debugging is on
maui−nas−02(config)#line 1 192
maui−nas−02(config−line)#modem autoconfigure type MY_MODEMCAP