|Bell 103T||0-300 bps in North America|
|V.21||300 bps -- not Bell 103-T compatible|
|Bell 212A||1200 bps in North America|
|V.22||1200 bps outside of North America|
|V.22bis||2400 bps worldwide|
|V.32||9600 bps worldwide|
|V.32bis||14400 bps worldwide|
|V.32terbo||19600 bps worldwide|
|*HST||US Robotics 9600-16800|
|*V.FC||28800 pre V.34. Similar to V.34 but not fully compatible|
|*X2||One of two competing "56K" standards|
|*K56Flex||One of two competing "56K" standards|
|*V.90||Universal 56K modem standard. Will connect to an X2 ot K56Flex modem at 28.8.|
|*v.pcm||the final 56K standard to be compatible with both X2 and K56Flex. Probable hardware availability -- early 1998|
Over and above transmission speed, standards are used for error correction and compression.
|*MNP [Microcom Networking Protocol]||Levels Error Correction/ compression. Comes in various levels.|
|MNP1||Asynchronous half duplex|
|MNP2||Asynch Simple Error Correction (Included in V.42)|
|MNP3||Synch Simple Error Correction (Included in V.42)|
|MNP4||Improved Simple Error Correction (Included in V.42)|
|MNP5||Simple Data Compression (2:1)|
|MNP6||Statistical duplexing, Universal Link Negotiation.|
|MNP7||Improved Data Compression (3:1)|
|MNP8||MNP7 for pseudo duplexed modems|
|MNP9||V.32 Data Compression|
*These are "informal" standards. Translation -- They possibly will not work properly with many other modems today, and probably will work with even fewer in the future.
It was pointed out in the discussion of this article in the forum, that devices that actually comply to a real standard (if such are available) will be more likely to operate reliably and at the claimed speed in normal usage than non/pre-standard modems.
Return To Index Copyright 1994-2008 by Donald Kenney.