Subject: Data Connection's SNAP-LLC2 Product

From: Nigel Williams <[email-masked]>
Date: Tue, 30 Jan 96 16:57:00 GMT

All

Jim Cobban recently referred to SNAP-LLC2 on this mail exploder as an 
implementation of the Token Ring Architecture that contained "weird 
perversions" to get around some interoperability problems with VTAM/NCP. 
 Specifically, Jim stated that SNAP-LLC2 sends all its XIDs as responses. 
 Although Jim has corrected his statement, we feel that we should confirm 
that SNAP-LLC2 *does not* send all its XIDs as responses.  It only sends an 
XID as a response if it has received an XID command after the last XID was 
sent.

Data Connection's SNAP-LLC2 product is a full and portable C implementation 
of a Class II Logical Link Controller (LLC) based on International Standard 
ISO 8802.2.  We have enhanced the basic architecture specifically to ensure 
interoperability with implementations based on the IBM Token Ring 
Architecture Reference as well as those based on ISO 8802.2.

SNAP-LLC2 is in use by several key players in the communications industry, 
including Nortel,  and has undergone extensive interoperability testing 
which has included the following products.

 - Attachmate Extra! for OS/2
 - Attachmate/DCA Irma Workstation for Windows
 - AT&T/NCR SNA Services
 - HP SNAplus
 - IBM AIX SNA Server
 - IBM AS/400
 - IBM Communications Manager/2
 - IBM LAN Server
 - IBM LAN Support Program
 - IBM VTAM via 3745 and 3172
 - IBM 6611
 - Microsoft LAN Manager
 - Microsoft SNA Server
 - Unisys e/SNA

As Jim has already pointed out, the problem he observed was a limitation of 
the SNAP APPN Demonstration System which is not a product in its own right 
and does not contain SNAP-LLC2.  This limitation is not an issue for either 
SNAP-LLC2 or SNAP APPN.

Regards
Nigel Williams

Data Connection Ltd