Paradyne COMSPHERE 3800PLUS User Manual page 204

COMSPHERE 3800Plus Modems
autorate To adjust to varying VF line conditions by changing the data rate to a higher or lower rate after
connection. The lowest rate the modem autorates to is 4800 bps; the highest possible rate
depends on the modulation the modems connected with. In V.34, the modems may autorate
asymmetrically.
backplane A common bus at the rear of a nest or chassis that provides communications and power to
circuit card slots.
baud
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.
bis Latin for twice . Used to distinguish the second version of a standard from other versions; e.g.,
V.32bis.
bisync
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.
bit
Binary digit. The smallest unit of information, representing a choice between a one or a zero
(sometimes called mark or space).
bps
Bits per second. Indicates the speed at which bits are transmitted across a data connection.
buffer
A temporary storage area used to compensate for differences in data flow rate when transmitting
data from one device to another.
byte
A sequence of successive bits (usually eight) handled as a unit in data transmission.
Call Setup
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.
carrier
The rack mounting that contains 17 slots: 1 control slot and 16 device slots.
carrier-mounted 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.
CCITT
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.
character
A letter, figure, number, punctuation, or other symbol.
character echo
A way to check the accuracy of data transmission by sending (displaying) all the characters
being transmitted to the monitor.
circuit pack lock
A screw lock tab installed over a circuit card's latch release tab to prevent the unit from being
removed without a tool.
Class 1 fax A fax modem standard. Under Class 1 computer software handles most of the protocol,
compression, and conversion tasks.
Class 2 fax
A fax modem standard. Under Class 2 the modem handles most of the protocol, compression,
and conversion tasks as well as modulation, leaving the computer free for other work.
Command mode One of two modem operating modes. When in Command mode, the modem accepts commands
instead of transmitting or receiving data.
configuration area
One of five areas within the Configure branch containing modem settings. Configuration areas
include Active (Operating), Active (Saved), Customer 1, Customer 2, and Factory.
configuration option
Device software that sets specific operating parameters for the device. Sometimes referred to as
straps.
Configure Top-Level menu branch that contains all the device's configuration options.
Glossary-2 October 1998 3980-A2-GB30-40