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COMSPHERE 3900 Series Modems
Glossary-2 September 1998 3910-A2-GN32-40
A unit of signaling speed that is equal to the number of symbols per second. This is not
necessarily the same as bits per second, although the terms are frequently interchanged.
A standard for 300 bps data transmission.
A standard for 1200 bps data transmission.
Latin for twice. Used to distinguish the second version of a standard from other versions; e.g.,
V.32bis.
Binary synchronous communications. An IBM communications protocol that has become an
industry standard. It uses a defined set of control characters and control-character sequences
for synchronized transmission of binary-coded data between stations in a data communications
system.
Binary digit. The smallest unit of information, representing a choice between a one or a zero
(sometimes called mark or space).
Bits per second. Indicates the speed at which bits are transmitted across a data connection.
A method of transmission. The simultaneous transmission to two or more communicating
devices.
A temporary storage area used to compensate for differences in data flow rate when transmitting
data from one device to another.
A sequence of successive bits (usually eight) handled as a unit in data transmission.
Top-Level menu branch that contains all the functions necessary to dial telephone numbers
stored in directory locations, answer incoming calls, disconnect calls, and save telephone
numbers to directory locations.
A continuous frequency signal that can be modulated by another signal that contains information
to be transmitted.
A device that is designed for installation in a COMSPHERE 3000 Series Carrier and used at
central-site operations. Up to 16 devices can be installed per carrier, with six carriers per cabinet.
Consultative Committee on International Telegraphy and Telephony. An advisory committee
established by the United Nations to recommend communications standards and policies. It was
renamed ITU in March 1993.
A bidirectional voice, or data path for electrical transmission between two or more points. Also
called a circuit, line, link, path, or facility.
A letter, figure, number, punctuation, or other symbol.
A way to check the accuracy of data transmission by sending (displaying) all the characters
being transmitted to the monitor.
A screw lock tab installed over a circuit card’s latch release tab to prevent the unit from being
removed without a tool.
One of two modem operating modes. When in Command mode, the modem accepts commands
instead of transmitting or receiving data.
One of five areas within the Configure branch containing modem settings. Configuration areas
include Active (Operating), Active (Saved), Customer 1, Customer 2, and Factory.
Device software that sets specific operating parameters for the device. Sometimes referred to as
straps.
Top-Level menu branch that contains all the device’s configuration options.
An outlet on equipment and cables that provides a connection.
baud
Bell 103J
Bell 212A
bis
bisync
bit
bps
broadcast
buffer
byte
Call Setup
carrier
carrier-mounted
CCITT
channel
character
character echo
circuit pack lock
Command mode
configuration area
configuration option
Configure
connector