US Robotics COURIER Instrukcja Użytkownika Pobierz pdf (Strona 290)

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101

U.S. Robotics I-modem Command Reference

Glossary • Page G-32

parallel transmission

The transfer of data characters using parallel electrical paths for each bit of the character,

for example, 8 paths for 8-bit characters. Data is stored in computers in parallel form, but

may be con-verted to serial form for certain operations. See serial transmission

parity

An error-detection method that checks the validity of a transmitted character. Character

checking has been surpassed by more reliable and efÞcient forms of block-checking,

including XMODEM

-type protocols and the ARQ protocol implemented in Courier

modems.

The same type of parity must be used by two communicating computers, or both may omit

parity. When parity is used, a parity bit is added to each transmitted character. The bit's

value is 0 or 1, to make the total number of 1's in the character even or odd, depending on

which type of parity is used.

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