CCITT Competing
Name standard? AKA standard Speeds
V.17 Y 7,200, 9,600,12,000, 14,400
V.21 Y Bell 103 300
V.22 Y Bell 212A 1,200
V.22 bis Y 1,200, 2,400
V.23 Y 600/75, 1,200/75
V.26 Y 2,400
V.26 bis Y 1,200/75, 2,400/75
V.26 ter Y Bell 201 2,400
V.27 Y Bell 208 4,800
V.27 bis Y 2,400/75, 4,800/75
V.27 ter Y 2,400, 4,800
V.29 Y 4,800, 7,200, 9,600
V.32 Y Bell 209 4,800, 9,600
V.32 bis Y V.32 terbo 4,800, 7,200, 9,600, 12,000, 14,400
V.32 terbo (AT&T) V.32 bis, 19,200
V.34
V.32 FC (Rockwell) 28,800
V.33 Y 12,000, 14,400
V.34 Y V.Fast V.32 terbo 28,800, 115,200 - with compression
V.42 Y Hayes LAP-M Used with V.22, V.22 bis, V.26 ter, V.32, V.32 bis
with MNP
Class 4
V.42 bis Y Data MNP Class 5 57,600 - with compression
compression
Acronym Expansion
Aka Also known as
AT&T American Telephone and Telegraph Company
Bell Bell Laboratories (part of AT&T)
bis 2nd
CCITT Consultative Committee on International Telegraphy and
Telephony (part of ITU)
ITU International Telecommunications Union
LAP-M Link Access Procedure Modem error control
MNP Microcom Networking Protocol
ter 3rd (terbo is a pun [bad pun is a tautology])
UART Universal Asynchronous Receiver/Transmitter
1. All speeds are in bps (bits per second)
2. A 16550 UART chip is not required for any of these standards
3. The table may be incomplete, but all data present is believed to be correct
4. Major reference: Newton's Telecom Dictionary, Harry Newton, Telecom Library Inc, ISBN 0-936648-42-2
Ron Savage.
Home page: http://savage.net.au/index.html
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Australian Copyright © 2002 Ron Savage. All rights reserved.
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