Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!cica!ctrsol!samsung!rex!wuarchive!texbell!attctc!vector!telecom-gateway From: cpsolv!rhg@uunet.uu.net (Richard H. Gumpertz) Newsgroups: comp.dcom.telecom Subject: Re: Need Information on "Bit Slippage" Message-ID: Date: 17 Nov 89 05:49:17 GMT Sender: news@vector.Dallas.TX.US Reply-To: "Richard H. Gumpertz" Organization: Computer Problem Solving, Leawood, Kansas Lines: 25 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us X-TELECOM-Digest: volume 9, issue 519, message 1 of 8 In article johnk@opel.UUCP (John Kennedy) writes: >X-TELECOM-Digest: volume 9, issue 509, message 3 of 13 >A coworker is experiencing a problem while using a 1200-baud dialup >modem, where he is seeing periodic "}" symbols, and characters 0x255 >and 0x251. >When I was having a similar problem at another company, the phone >gurus there told me this was a phenomenon known as "bit slippage", >whereby two switches were losing sync on the digital connection >between them. I have also seen such problems when working with a PBX. The problem was that the trunk-card in the PBX was set for 600 ohm hybrid termination when 900 ohm was needed. Unfortunately, the manufacturer's testing sequence tested 900 first and then 600 so all trunk-cards were shipped in the 600 ohm position. The manufacturer's engineer said he had been trying to get the test sequence reversed because 900 is generally a better match. =============================================================================== | Richard H. Gumpertz rhg%cpsolv@uunet.uu.NET -or- ...uunet!amgraf!cpsolv!rhg | | Computer Problem Solving, 8905 Mohawk Lane, Leawood, Kansas 66206-1749 | ===============================================================================