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From: tnixon@hayes.uucp
Newsgroups: comp.dcom.modems
Subject: Re: What means "bis" and "ter"?
Message-ID: <3878.27e8a703@hayes.uucp>
Date: 21 Mar 91 12:28:50 GMT
Article-I.D.: hayes.3878.27e8a703
References: <10207@pitt.UUCP>
Organization: Hayes Microcomputer Products, Norcross, GA
Lines: 34

In article <10207@pitt.UUCP>, jonathan@cs.pitt.edu (Jonathan Eunice) writes:

> What is the meaning of the "bis" in V.32bis and V.42bis and the "ter"
> in V.27ter?   Are there any more of these little suffixes, and 
> what do they mean?  Finally,  is there any particular meaning to the
> assignment of numbers for V or X series standards?

The CCITT (which is based in Geneva, a French-speaking area) uses 
"bis" to indicate the second in a family of related standards, and 
"ter" to indicate the third.  I think "quatre" would come next, but 
I can't say I've ever seen one.

The assignment of number is NOT in ascending numeric order.  The V 
series recommendations, for example, are broken up into several 
categories:

	V.1-V.7		General
	V.10-V.33	Interfaces and voice-band modems
	V.35-V.37	Wideband modems
	V.40-V.42	Error control
	V.50-V.57	Transmission quality and maintenance
	V.100-V.230	Interworking with other networks

Within various groups, the numbers have been more or less assigned 
in ascending order chronologically.  There is NO direct correlation 
between the "speed" at which a modem operates and its numeric 
assignment.  It is best to simply consider CCITT number of 
recommendations to be RANDOM, and leave it at that.

-- 
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