Cisco AS5800 Specifications download pdf (Page 130)

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Cisco AS5800 Operations, Administration, Maintenance, and Provisioning Guide

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Chapter 3 Operations

Modem Management Operations

Configuring Modems Using Modem Autoconfigure

This section describes how to apply a new modem capability (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.

Modemcaps have many applications:

• A modem’s default settings are not optimal. For example, a modem function that you want is not

enabled by default.

• Two separate modem pools need to be set up in the NAS to perform two different tasks. For

example, one pool supports V.90. The other pool has a maximum speed set at 26400 bps to support

older modems.

• A specialized application is required. For example, a NAS supporting a point-of-sale (POS)

application such as a charge card reader. A modemcap is required that will tune the modem for a

fast trainup time at the expense of having a slower connect speed.

Always use a modemcap (even if you only want the modem’s default settings). To display the

modemcaps that are built into the Cisco IOS software, enter the show modemcap command.

Modemcaps are configured on a per modem basis. They are not configured on a per modem module or

service processing element (SPE) basis.

Basic Rules for Modem Autoconfigure

The following list describes the basic rules:

• Never use the modem autoconfigure discovery command. Applying specific modemcaps reduces

the risk of error.

• Always use the modem autoconfigure type modem-name command. This command improves your

modem’s performance.

• The modem autoconfigure type mica command can be used to reset any integrated modem (not

only MICA), back to its factory defaults. The keyword mica is a built-in modemcap that only

functions as &F (return to defaults).

• When you use the modem autoconfigure command, be sure that any script reset function is

removed. A script reset is redundant and possibly harmful.

• A script reset is a chat script that is applied to a line when the line resets. The modem autoconfigure

function is applied when the system starts up, not just when the line resets.

• When creating a modemcap, ignore all the strange and confusing fields. Put your modem init string

into the MSC (Miscellaneous) field:

–

Always start your init string with &F (or, for third party modems, with the preferred &F1, &F2,

etc.)

–

Never put an &W into an init string. An &W can wear out the EPROM on modems where this

is not a no op (that is, a statement or operation that does nothing).

–

For MICA modems, always be sure that &D2 (not &D3) is in effect.

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