Usrobotics V.34 Manual de usuario descargar pdf (Pagina 222)

COURIER HIGH SPEED MODEMS

Glossary J-13

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-T standard for facsimile operations that specifies

modulation at 14.4K bps, with fallback to 12K bps.

V.21Fax

An ITU-T standard 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-T standard 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-T standard for modem communications at 1200 bps,

compatible with the Bell 212A standard observed in the U.S.

and Canada.

V.22 bis

An ITU-T standard 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-T standard for modem communications at 1200 bps

with a 75 bps back channel. Used in the U.K.

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Usrobotics V.34 Manual de usuario Pagina 222