Cabletron Systems FRM User Manual - page 380
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Frame Relay Module 4. 0 User G uide, Rev 01
B
Banner
is the display area at the top of a screen that generally features product name, revision,
etc.
BPDU
stands for “Bridge Protocol Data Unit,” also called a “Hello” message. Bridges peri-
odically send BPDUs to update each other on their status.
bps
stands for “bits per second,” which is a rate of data transmission.
Bridge
is a device that links two local-area networks (LANs), receiving data from one LAN
and forwarding it to the other.
Broadcast
is a method of delivering the same data to all hosts in a network.
Buffer
is a storage device or routine used to compensate for a difference in the rate of data
flow or time of occurrence when transmitting data between devices.
C
Call
is a request for connection between two DTEs, each using a logical channels across
the DTE/DCE interface.
Checksum
is an arithmetic sum used to verify the integrity of bits of data. A bad checksum means
that the data is corrupted. An IP checksum is calculated only for the IP header, and is
re-calculated each time the datagram is transmitted.
Cluster controller
is a device that controls input/output of a group of devices (terminals, printers, PCs,
etc.) attached to it, and linking these devices to a mainframe.
Concentrator
is a communications device that allows a shared transmission medium to accom-
modate more data sources than there are channels available.
Configuration database
see “Database.”
Congestion
is a local condition that occurs when there are too many packets to be queued in the
node buffers, causing information transfer to be delayed.