Paradyne Comsphere 3920Plus Installation And Operation Manual page 268

COMSPHERE 392xPlus Modems
automatic dial standby
automatic rate control
backbone network
backplane
baud
Bisync
bit
bps
broadcast
buffer
byte
carrier
carrier-mount
CCITT
CCITT V.22
CCITT V.22bis
CCITT V.27bis
CCITT V.29
Glossary-2
When operating in Dial Backup mode, this function forces the modem to periodically
check the quality of the leased line. If the leased line is found to be at normal operating
condition, the modem disconnects from the dial network and continues normal operation
over the leased-line network.
Modems adjust their signaling rate based on current line conditions.
The primary route from a control modem to its first tributary when the communications
network contains extended control modems.
A common bus at the rear of the COMSPHERE 3000 Series Carrier connecting each
circuit card slot to the SDCP and/or SDU. It also distributes low-voltage ac power to
each slot.
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.
Binary Synchronous Communications. An IBM
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.
A contraction of binary digit. A bit, which is the smallest unit of information, represents
the 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 storage device used to compensate for differences in the 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.
The rack mounting that contains 17 slots: 1 control slot for an SDU and 16 modem slots.
See data carrier.
A modem that is designed for installation in a COMSPHERE 3000 Series Carrier and
used at central-site operations.
An advisory committee (Consultative Committee on International Telephone and
Telegraph) established by the United Nations to recommend communications standards
and policies.
A standard for modems operating full-duplex over dial networks at 1200 bps.
A standard for modems operating full-duplex over leased lines or dial networks at
2400 bps.
A standard for modems operating over leased lines at 2400 or 4800 bps.
A standard for modems operating over leased lines at 4800, 7200, or 9600 bps.
April 1995
r
communications protocol that has
3920-A2-GN31-10