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Article #44Re: Please critique: When is a B channel only 56K?
From: Tom Watson
Date: Mon, 08 Jan 1996 21:08
Date: Mon, 08 Jan 1996 21:08
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In article <4cec6n$fm7@mercury.near.net>, fgoldstein@bbn.com (Fred R. Goldstein) wrote: > > A conformant CSU for "AMI" (better known as AMI/ZCS, for Zero Code > Suppression) coding will NEVER send the 15 zeroes, and WILL insert > a zero if the source doesn't conform. Thus the alarm means the CSU > is not working or connected -- a disconnected wire looks like a > string of zeroes, no? > Isn't B8ZS where AMI violations are put in when it senses 8 zeros. The receiver then notices this and puts the zeros back to the channel unit. The violations were: 0++00--0 and 0--00++0 depending upon the previous bit signalled. This eliminated the need to force a bit on if all 8 bits of the channel were zero. Then again I could be wrong, and this is another format that people use. Its been a long time since I read the book. (*SIGH*)... -- Tom Watson tsw@3do.com (Home: tsw@johana.com)
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Path: arc1-ca.pugleaf.net!cypher.3do.com!user From: tsw@3do.com (Tom Watson) Newsgroups: comp.dcom.telecom.tech,comp.dcom.isdn Subject: Re: Please critique: When is a B channel only 56K? Date: Mon, 08 Jan 1996 13:08:38 -0800 Organization: The 3DO Corporation Distribution: world Message-ID: <tsw-0801961308380001@cypher.3do.com> References: <30DDC4F0.1364@fast.net> <c1a7cb$e2db.1e4@ambra.drcoffsite.com> <4c1q90$n37@mercury.near.net> <NEWTNews.820626346.32539.jrhodes@jrhodespc.nwest.mccaw.com> <4cec6n$fm7@mercury.near.net> NNTP-Posting-Host: cypher.3do.com