COURIER HIGH SPEED MODEMS
Throughput
The amount of actual user data transmitted per second without the overhead of protocol information such as Start and Stop bits or frame headers and trailers. Compare characters per second.
Transmission Rate
Same as Bit Rate.
V.17
An ITU-Tstandard for facsimile operations that specifies modulation at 14.4K bps, with fallback to 12K bps.
V.21⎯Fax
An ITU-Tstandard for facsimile operations at 300 bps. U.S. Robotics or compatible fax devices then transmit or receive at higher speeds.
V.21⎯Modem
An ITU-Tstandard for modem communications at 300 bps. Modems made in the U.S. or Canada follow the Bell 103 stan- dard. However, the modem can be set to answer V.21 calls from overseas.
V.22
A ITU-Tstandard for modem communications at 1200 bps, compatible with the Bell 212A standard observed in the U.S. and Canada.
V.22 bis
An ITU-Tstandard for modem communications at 2400 bps. The standard includes an automatic link negotiation fallback to 1200 bps and compatibility with Bell 212A/V.22 modems.
V.23
An ITU-Tstandard for modem communications at 1200 bps with a 75 bps back channel. Used in the U.K.
