Motorola 326X V.34 manual Remote Configuration, Error Correction and Data Compression, Security

About the Modem

Remote Configuration

Using the local front panel, an NMS, or local-modem AT ACU, you can configure a remote modem. You can also read the remote modem’s status snapshots and receive its configuration summary on a front panel or async terminal.

Error Correction and Data Compression

The modem provides error correction and data compression in accordance with the V.42 and V.42bis ITU-TS recommendation. With V.42, modems automatically determine whether to use Microcom Networking Protocol (MNP) Level 4 or Link Access Procedure for Modems (LAPM) for error correction. Depending on the scheme negotiated, the modem uses MNP Level 5 or V.42bis data compression. The SDC modem uses LAPM with a Motorola proprietary data compression technology.

Security

The modem provides access security at two levels:

•Front panel

•Modem access

Front panel security lets you password-protect a modem from access by other users. This prevents unauthorized changes from being made to a configuration. Front panel security does not prevent you from using the modem.

You can also screen incoming calls so that unauthorized users cannot access a modem. This is accomplished with password and callback functions.

Appendix A explains how to configure security features.

Status Snapshots

The modem’s status snapshot feature lets you view a local or remotely controlled modem's EIA signals and Motorola circuit quality monitoring system (CQMS) parameters, and view a configuration summary.

CQMS parameters continuously estimate major line parameters without disrupting data traffic. Measurement of such selections as signal-to-noise ratio and receive level helps you to isolate causes of degraded network performance.

1-8 About the Modem