External clocking and Sangoma S514/S508 SDLC PCI adapter driver (296821)

MORE INFORMATION

External clocking is configured in the SANSDLC1 link properties when line speed is set for 0 (zero). External clocking is essentially clocking that is handled by the Data Communications Equipment (DCE); in this case, it is handled externally by the Channel Service Unit/Data Service Unit (CSU/DSU) instead of internally by the SDLC adapter.

If the line speed is configured to 56000 in the SANSDLC1 link properties, the SDLC connection becomes active. However, with this configuration, clocking is handled both internally by the SDLC adapter and externally by the CSU/DSU, causing transmission of data to become out of sync.

When the SDLC connection is pending, an event 23 with an outage code of 25 is logged in the Windows NT 4.0 Server application log. The following is an example of the event:

Event Type:	Warning
Event Source:	SNA Server
Event Category:	None
Event ID:	23
Date:		4/12/2001
Time:		1:00:54 PM
User:		S-1-5-21-1915688249-670910532-2033415169-500
Computer:	MYCOMPUTER
Description:
Connection Failure
   Connection   = MYCONNECTION 
   Link Service = SANSDLC1
   Outage Code  = 0025
 
 EXPLANATION
 A link service reported a connection failure to the node. See below for more information on the outage code that caused the connection to fail.
 
 SDLC
 
 0025
 
 Idle timeout retry exceeded. The SNA connection has not received an SDLC response from the remote system, causing a connection timeout. 
 Common causes include: (1) wrong duplexing (2)  wrong NRZI value, (3) a bad SDLC cable, (4) line is too fast for adapter,(5) a modem 
 configuration issue (6) a bad SDLC adapter.
				

You can obtain the drivers for this adapter for SNA Server and Host Integration Server 2000 from the following Web site: Sangoma's FTP site has drivers for the following configurations:

• SNA Server and Host Integration Server 2000 running in Microsoft Windows 2000 Server. The following files are listed under the Win2000 folder:
  • Sanglink_w2k.msi
  • Sangsync.inf
  • Sangsync.sys
• SNA Server running in Windows NT 4.0 Server. The following files are listed under the Winnt folder:
  • Readme.txt
  • Sanglink.msi

Sangoma's FTP site has not released the SDLC driver for Host Integration Server 2000 running in Windows NT 4.0 Server.

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