0049-1800-xxx 326X V.34, V.34-SDC and V.32bis Series Modem – USER’S GUIDE 02/23/2010
Rev. A
Page 15
of
205
Refer to Chapter 4, Configuring the Modem, for details.
The synchronous data compression feature in the 326X
FAST
-SDC Modem is Raymar-Telenetics’ proprietary
technology.
AUTOMODE/MULTIMODE FEATURE
Using
Automode/Multimode
, the modem can automatically negotiate the highest common modulation speed
(within a modulation mode) with another 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
Raymar-Telenetics’ 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
Raymar-Telenetics circuit quality monitoring system (CQMS) parameters, and view a configuration summary.
