Thread View: comp.sys.unisys
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Started by Bill Versteeg
Mon, 11 Jan 1993 17:20
seeking info on UDLC, P1024 and Uniscope
Author: Bill Versteeg
Date: Mon, 11 Jan 1993 17:20
Date: Mon, 11 Jan 1993 17:20
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I am looking for some information on some Unisys specific protocols. I am told that UDLC is Unisys' flavor of HDLC, and it has some different reject codes. I am told that Uniscope and P1024 are some other synchronous Unisys protocols. I need some hard protocol specs for these protocols. Any pointers, antecdotes, rumors, or idle gossip would be appreciated. A reference to a document describing these protocols would be GREATLY appreciated. Bill VerSteeg bvs@ver.com
Re: seeking info on UDLC, P1024 and Uniscope
Author: Walt Kemmerer
Date: Mon, 11 Jan 1993 19:32
Date: Mon, 11 Jan 1993 19:32
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Bill, The UDLC and Uniscope protocols are indeed Unisys-specific, both hailing back to the old Sperry Univac side of the house. As for P1024, these are actually a series of airlines protocols (P1024A, P1024B, and P1024C) that are implemented in the Unisys (Sperry) Distributed Communications Processor (DCP) family under the heading of AIR/net (with some other airlines specific stuff also being thrown in, like AX.25 and Inverted and Real ALC). The P1024C data presentation bears a strong resemblance to Uniscpe data stream but the protocol wrapper is quite different. There is some documentation on the Uniscope and UDLC protocols in the DCP "dump buster's guide", which is on the release tape for the DCP software release, called TELCON. While this document is no longer being actively supported (it appears), the UDLC and Uniscope stuff hasn't changed for some time. There were also actual documents on these protocols: look around for an old Sperry document called the UDLC General Description (UP number not in front of me), and any of the Uniscope family (U400, UTS4000, UTS20, UTS40, UTS60) Programmer's Reference Manuals (I believe). These all pretty much were the same vis a vis the protocol wrapper that Uniscope implements but the data presentation layer capabilities varied in the different mambers of the family. I believe I have copies of several of these (including the UDLC document), but I'll have to unarchive them to give you the old UP numbers, and then you're on your own in getting Unisys to decipher what they are called these days (if they are even in print). Best place for P1024 documentation is probably SITA, which has a USA presence in GA, so you're in luck there. Beware, however, that many airlines use P1024 as a starting point and then implement bilateral agreements to modify the protocol for their own specific link. This is a relatively common practice, so beware when an IBM or Tandem P1024 variant is in play; check for bilaterals. If I can be of further assistance, post a follow-up here in comp.sys.unisys and I'll see what I can do to help you out. The whole arena of Unisys (Sperry) comms is pretty much under-documented but it's not all that hard to decipher :-) Cheers, Walt ---------------------------------------------------------- I/O Specialists, Inc. : kemmerer@ioscc.neosoft.com 3906 Green Fields :----------------------------------- Sugar Land, TX 77479 : Networking and Communications 713.858.0997 :-----------------------------------
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