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COMSPHERE 3900 Series Modems
GL-2 November 1996 3910-A2-GN32-30
automatic dial backup When leased-line operation fails, this function forces the modem to
dial the telephone number stored in directory location 1.
automatic dial standby 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.
automatic rate control
Modems adjust their signaling rate based on current line
conditions.
backbone network The primary route from a control modem to its first tributary when
the communications network contains extended control modems.
backplane 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.
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.
Bisync
Binary Synchronous Communications. An IBM
r
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 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).
bps
Bits per second. Indicates the speed at which bits are transmitted
across a data connection.
broadcast
A method of transmission. The simultaneous transmission to two
or more communicating devices.
buffer A storage device used to compensate for dif
ferences in the 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.
carrier The rack mounting that contains 17 slots: 1 control slot for an SDU
and 16 modem slots. See data carrier.
carrier-mount
A modem that is designed for installation in a COMSPHEREr
3000 Series Carrier and used at central-site operations.