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Microsoft KB Archive/159349

From BetaArchive Wiki

Resume On Ring Not Implemented for PC Card Modems


The information in this article applies to:

  • Microsoft Windows 95 OEM Service Release, version 2.0


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.


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.


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

This issue is resolved by the following updated file for Windows 95 OSR2, and later versions of this file:

   PCCARD.VXD  version 4.00.1112  dated 11/1/96  78,553 bytes 


Microsoft has confirmed this to be a problem in Microsoft Windows 95 and OEM Service Release 2 (OSR2). An update to address this problem is now available, but is not fully regression tested and should be applied only to computers experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft does not recommend implementing this update at this time. Contact Microsoft Technical Support for additional information about the availability of this update.

This issue is resolved in Microsoft Windows 98.


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:

Q159348 No Windows 95 Support for Zoomed Video

For additional information about issues resolved by updates to this component, please see the following articles in the Microsoft Knowledge Base:

Q168909 Query/Remove Support for CardBus Cards Hangs Computer

Q166826 Data Read from ROM PC Card Device May Be Damaged

Q166400 Inserting SRAM Card into Docking Station May Hang Computer

Q164227 Second PC Card Not Recognized When Inserted in Dock

Q161994 Querying Powered-Off PC Card Modem Hangs Computer

Q159543 Intel ProShare PC Card May Hang Computer

Q159492 PC Card Device Not Enumerated When Reinserted

Q159348 No Windows 95 Support for Zoomed Video Devices

For additional information about Windows 95 updates, please see the following article in the Microsoft Knowledge Base:

Q161020 Implementing Windows 95 Updates

Additional query words: 95 wake

Keywords : kbhw osr2 win95
Issue type : kbprb
Technology : kbWin95search kbOPKSearch

Last Reviewed: June 13, 2001
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