US Robotics COURIER - Page 188

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BPS
COURIER HIGH SPEED MODEMS
modems are established at set bit rates, commonly 110, 300, 1200,
2 400
I 4800 I 9600 I and 14400.
The bits (binary digits) per second rate.
Buffer
Byte
A memory area used as temporary storage during input and
output operations. An example is the modem's command
buffer. Another is the Transmit Data flow control buffer used
for flow control and to store copies of transmitted frames until
they are positively acknowledged by the receiving modem.
A group of binary digits stored and operated upon as a unit. A
byte may have a coded value equal to a character in the ASCII
code (letters, numbers), or have some other value meaningful to
the computer. In user documentation, the term usually refers to
8-bit
units or characters. 1 kilobyte (K) is equal to 1,024 bytes or
characters; 64K indicates 65,536 bytes or characters.
Carrier
A continuous frequency capable of being either modulated or
impressed with another information-carrying signal. Carriers
are generated and maintained by modems via the transmission
lines of the telephone companies.
CC/TT
An international organization that defines standards for tele-
graphic and telephone equipment. For example, the Bell 212A
standard for 1200 bps communication in North America is
observed internationally as CCITT V.22. For 2400 bps com-
munication, most U.S. manufacturers observe V.22 bis. The
initials CCITT represent the French name; in English it's known
as the International Telegraph and Telephone Consultative
Committee.
Character
A representation, coded in binary digits, of a letter, number, or
other symbol.
Glossary G-3