Agilent Technologies HSSI WanProbe J3916A - Manual (Page 156)

Glossary
136
Congestion
Exceeding the bandwidth of a virtual path or network capacity.
Console
The ASCII terminal, or PC emulating an ASCII terminal that is connected to the
probe and used to configure, monitor, and troubleshoot the probe.
Control field
Field used to identify an I-frame, S-frame, and U-frame and control the behavior
of the frame.
COP (Character-oriented protocol)
A link protocol utilizing control characters imbedded in the data flow.
CRC (Cyclic Redundancy Check)
A mathematical algorithm to derive the frame check sequence (FCS) in bit-
oriented link protocols or the block check characters in character-oriented
protocols.
CSMA/CD (Carrier Sense Multiple Access/Collision Detection)
The network access-control mechanism that is based on collisions and utilized by
Ethernet networks. On contention-based networks, like Ethernet networks, each
station must detect an idle network prior to transmitting. If more than one station
transmits simultaneously, a collision occurs, all stations are notified, and the
colliding stations try retransmitting after waiting a random amount of time.
CSU (Channel Service Unit)
A T1 digital signal regenerator straddling the boundary between outside (the line
to/from the central office) and the inside (the DSX-1 signal distribution within the
customer premises.) CSUs generally interface to DSUs or Multiplexors on the
inside.
Customer Premises Equipment (CPE)
Customer owned equipment used to terminate or process information from the
public network. For example, a T1 multiplexer or a PBX.