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iSPAN Serial WAN Adapter Users Guide 197
BRI (Basic Rate Interface) ◆ A defined ISDN interface that includes
two B channels and one D channel. Also known as 2B+D. B channels
are used for voice and data while the D channel is generally used only
for signalling within the telephone network.
Broadcast ◆ LAN transmission method used in bus topology net-
works that sends messages to all stations even though the messages are
addressed to specific stations.
BTU ◆ See Basic Transmission Unit (BTU).
CALC (Customer Access Line Charge) ◆ A Federal tariff charge,
also referred to as an End User Common Line Charge (EUCL), or Sub-
scriber Line Charge (SLC). Every ISDN line is charged one CALC or
EUCL.
Call Bumping ◆ The ability to receive an incoming call during a
bonded outbound call.
CCITT (International Telephone and Telegraph Consultative
Committee)
◆ See ITU (International Telecommunication Union).
CD (Carrier Detect) ◆ RS-232 (V.24) control signal (on pin 8) that
indicates that the local data communications equipment is receiving a
signal from the remote DCE. (See RS-232.) Also called Received Line
Signal Detector (RLSD) and Data Carrier Detect (DCD).
Centrex ◆ Local Public Exchange incorporating PBX (Private
Branch Exchange) facilities.
Channel ◆ 1) A path along which signals can be sent, for example
data channel, output channel. 2) In data communication, a means of
one-way transmission. 3) A function unit, controlled by the processor,
that handles the transfer of data between processor storage and local
peripheral equipment.
Channel Aggregation ◆ Channel aggregation combines multiple
physical channels into one logical channel of greater bandwidth. With
BRI ISDN connections, channel aggregation would combine the two
64 Kbps B channels into a single, logical 128 Kbps channel.
Circuit Switching ◆ Technique in which physical circuits (as opposed
to virtual circuits) are transferred to complete connections. Contrast
with packet-switched networks.
Clock ◆ Timing signal used in synchronous transmission.