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03 What do V.32, V.42, bis, MNP, etc mean? (Modems and Cables - Macintosh)




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This article is from the Mac communications FAQ, by Bruce L Grubb BruceG6069@aol.com with numerous contributions by others.

03 What do V.32, V.42, bis, MNP, etc mean? (Modems and Cables - Macintosh)

Because these topics are universal telecommunications issues,
they are more fully discussed in comp.dcom.modems. However, a
short description of some of the more common abbreviations and
buzzwords is given below.

   Buzzword         What it typically means
---------------   ----------------------------------------------
   bit             : binary digit; amount of information necessary
                     to distinguish between two equally likely
                     events (such as the value of a binary digit)
   byte            : eight bits; size of a single ASCII character
   bps             : bits per second
   baud            : one analog signal state change; people usually
                     use baud and bps interchangeable, although most
                     modern modems can encode multiple bits per baud
   Bell 103        : 300 bps U.S. Standard
   Bell 212A       : 1200 bps U.S. Standard
   LAP/M           : Link Access Protocol/Modem.
   MNP             : Microcom Networking Protocol (Proprietary)
   MNP5            : MNP extension; 2 to 1 data compression.
   V.32            : 9600bps, 4800bps
   V.32bis         : 14.4Kbps, 12Kbps, 9600bps, 7200bps, 4800bps
   V.32terbo       : psuedo-standard extending V.32bis to 16.8, 19.2 kbs
   V.34            : 28,800 bps, 14,400 bps, 9,600 bps, 2,400 bps
   V.Fast          : Interim version of V.34; sometimes used as a
                         nickname for V.34
   V.FC            : proprietary Rockwell protocol used before V.34
                           was approved as a standard
   V.42            : MNP 4 and LAP/M modem to modem error correction
   V.42bis         : LAP/M and 4-to-1 data compression.
   V.44            : Internet focused compression
   X2/K56flex      : Two incompatable proprietary formats for 56K
                     Dependent on a digital equipment which some areas
                     do not have.
   V.90            : base standard for 56K; 33,600 bps upload maximum
   V.92            : Improved 56K stadard; 48,000 bps upload maximum

Note: Some V.FC modems do not work with V.34 modems at 28,800 bps.

   FAX standards:
     V.21          : 300 bps FAX
     V.27ter       : 4800 bps FAX
     V.29          : 9600 bps FAX
     V.17          : 14400 bps FAX

Table 1.3.1

 

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