Microsoft KB Archive/216590

= Using Attachmate Advanced Function adapter on multidrop line =

Article ID: 216590

Article Last Modified on 2/22/2007

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APPLIES TO


 * Microsoft SNA Server 3.0
 * Microsoft SNA Server 3.0 Service Pack 4
 * Microsoft SNA Server 4.0
 * Microsoft Host Integration Server 2000 Standard Edition
 * Microsoft Host Integration Server 2000 Service Pack 1

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This article was previously published under Q216590



SYMPTOMS
When the Attachmate Advanced Function Synchronous Data Link Control (SDLC) adapter is used to connect the SNA Server computer to a multidrop leased line, Request to Send (RTS) may be held high, causing other devices connected to the line to drop.

If one of the other devices on the multidrop line happens to be another SNA Server computer and it loses its connection, an Event 23, Outage code 0084, may be logged in the Windows NT Application Event log. The outage code indicates that the SNA Server computer is not receiving Receiver Ready (RR) poll responses from the remote system, causing the connection to timeout.



CAUSE
When RTS is held high, a point-to-point connection is created, and other devices on the multidrop line cannot send data on the line.

For more information, please see the following article in the Microsoft Knowledge Base: For additional information about configuring an SDLC connection with an SNA Server computer using a multidrop line, click the following article number to view the article in the Microsoft Knowledge Base:

123832 Using SNA Server with SDLC multidrop leased lines

123832 Using SNA Server with SDLC Multidrop Leased Lines



RESOLUTION
Contact Attachmate to obtain the latest Advanced Function adapter drivers that include the fix for this problem.



MORE INFORMATION
To verify that RTS is being held high, check the RTS light on the modem or CSU/DSU when the connection is started on the SNA Server computer. If the RTS light is solid (as opposed to flashing), then RTS is being held high. The Modem Monitor utility that ships with SNA Server can also be used to check RTS. This utility can be run from the Tools menu in SNA Manager.

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

Keywords: kb3rdparty kbinfo KB216590

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