User Manual

40
Modem AT Commands
Appendix A
Mini PCI User’s Guide Xircom Inc
S98 Cable Detection Options
• This register controls the automatic detection and reporting of changes in the cable or alternative connector
attached to the modem.
S98=0 Disables cable detection and reporting.
S98=1 Enable cable detection; disable reporting.
S98=2
Enable cable detection and reporting.
S109 V.90 or K56flex Operation
• This register controls the automatic detection or forced setting of V.90 or K56flex standards for operation
at up to 56Kbps.
Xircom firmware for current 56K modem products includes support for the V.90 56K
modem standard. This firmware is designed to initially attempt to make a V.90
connection, then fall back to K56flex if the host being dialed does not support V.90.
However, the host being dialed must support V.90 autodetect in order for a V.90
connection to be initiated by default. If the V.90 host you are calling does not support
autodetect, it will be necessary to issue an ATS109=2 command to the modem in order to
force a V.90 connection. If this command is used and a V.90 connection is still not
achieved, the modem will fall back directly to V.34 (when S109=2, fallback from V.90 to
K56flex is disabled). To set this value back to the default, issue ATS109=1.
S98=0 Forces K56flex; fallback to V.34.
S98=1
Negotiates V.90 initially if host supports V.90 autodetect; negotiates fallback
to K56flex if V.90 autodetect or V.90 is not supported.
S98=2
Forces V.90 for PCM connects; if host does not support V.90, falls back
directly to V.34.
How to Set S109
•
To change the value of the S109 register with a terminal emulation program (such as
Hyperterminal), enter ATS109=n (where n is 0, 1, or 2) in modem command mode.
•
To change the value of the S109 register with Windows 95, 98, or NT Dial-Up
Networking, go to Control Panel, Modems, highlight the Xircom modem and click
Properties. Click Connections/Advanced. Enter S109=n (where n is 0, 1, or 2) in the
Extra Settings box.