Resume On Ring Not Implemented for PC Card Modems

The information in this article applies to:

• Microsoft Windows 95 OEM Service Release version 2

SYMPTOMS

If a communications program has been configured to automatically answer incoming calls and the computer is placed into a Suspended power- management state, the computer does not resume when an incoming call arrives.

CAUSE

This functionality, known as "Resume On Ring," is designed to allow the modem to awaken the computer from a suspended state when an incoming call arrives if the modem has been configured to automatically answer incoming calls.

The Advanced Power Management features of Windows 95 OEM Service Release 2 (OSR2) do not support this functionality.

RESOLUTION

To work around this issue, do not suspend the computer when the modem is configured to automatically answer incoming calls.

STATUS

Microsoft has confirmed this to be a problem in Microsoft Windows 95 OSR2. A fix to this problem is in development, but has not been regression tested and may be destabilizing in production environments. Microsoft does not recommend implementing this fix at this time. Contact Microsoft Technical Support for more information about the availability of this fix.

MORE INFORMATION

The Resume On Ring feature is supported by the PC Card Event WakeUp mechanism defined in the ExCA specification. This is an optional mechanism, and it is not supported by all PC Card modems.

When a modem port is opened by a program, the modem is powered up in a persistent state. When the computer is suspended, the modem is set up for Resume On Ring, if it can be, because it is in a persistent-on power state.

For additional information about related issues, please see the following article in the Microsoft Knowledge Base:

   ARTICLE-ID: Q159348
   TITLE     : No Windows 95 Support for Zoomed Video