Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!pasteur!ucbvax!MOE.MCRCIM.MCGILL.EDU!philipp From: philipp@MOE.MCRCIM.MCGILL.EDU (Philip Prindeville) Newsgroups: comp.protocols.tcp-ip.ibmpc Subject: Re: DS1/DDS PC Boards Message-ID: <8809021833.AA01520@Moe.McRCIM.McGill.EDU> Date: 2 Sep 88 18:33:55 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 35 > Date: 2 Sep 88 00:32:04 GMT > From: Jerry Merlaine > Subject: DS1/DDS PC Boards > To: pcip@louie.udel.edu > > Are there PC (8- or 16-bits) boards on the market that somehow connect > up to AT&T's DDS (56 kbit) or DS1 (1.5 mbit, not really aka T1) services? > Are they certified by AT&T? Are there any packet interchange standards here? > Besides SL/IP :-) ? I know about the trick where inverted HDLC signals > pass DS1 signal specs. Any further comments on this? > > Companies, addresses, phone numbers, product propaganda cheerfully accepted. > > Jerry O. Merlaine > [ ... ] This has come up before (in April I think), but PCIP probably gets new readers all the time, so... Yes, there are at least two that I know of. One is called Speedlinx-II and is made by DSP Technology, in Dallas Tx. It is a PC interface with: local RAM, an 80186, an HDLC/LAPB processor, and a DDS-56 DSU. The other is rated at T1 speed (though I don't know if it will achieve 99.9% line utilization), made by MetaComp of San Diego, CA. It is also a PC interface, has local RAM, an 80186, an serial synchronous control. The line interface is done as a daughter board. I don't know if a T1 board is available for it or whether you have to use a V.35 interface and a DSU/CSU. The Speedlinx board is AT&T certified. SLIP at T1; Good luck. Actually, there is work being done to support IP (or XNS, or DECnet, etc) over bit-synchronous lines. This is being done by the Synchronous Point-to-Point Protocol Working Group. I'm the chair, and we should have a draft document out real soon now... Several vendors are involved and have tentatively agreed to support it. -Philip