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COURIER HIGH SPEED MODEMS
Glossary J-3
Bisync
Binary Synchronous Control. An earlier protocol developed by
IBM for software applications and communicating devices
operating in synchronous environments. The protocol defines
operations at the link level of communications, for example, the
format of data frames exchanged between modems over a
phone line. See Protocol, HDLC, SDLC.
Binary Digit
A 0 or 1, reflecting the use of a binary numbering system (only
two digits). Used because the computer recognizes either of
two states, OFF or ON. Shortened form of binary digit is bit.
Bit Rate
The number of binary digits, or bits, transmitted per second
(bps). Communications channels using telephone channel
modems are established at set bit rates, commonly 300, 1200,
2400, 4800, 9600, and 14400.
BPS
The bits (binary digits) per second rate.
Buffer
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.
Byte
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.
Call Indicate
A call originating tone defined by ITU-T recommendation V.8.