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Glossary
ATM
BER
binder group
C
CAS
CDV
CDVT
CE
CIR
CLP
CO
CPE
CPSS
CRC
GL-2
asynchronous transfer mode
A multiplexing/switching technique in which information is organized into
fixed-length cells, with each cell consisting of an identification header field
and an information field. The transfer mode is asynchronous in the sense that
the use of the cells depends on the required or instantaneous bit rate.
bit error ratio
The BER is the ratio of incorrect bits to total number of bits transmitted.
a group of cables sharing the same conduit
control
C is a control signal for X.21.
channel associated signaling
CAS is a type of E1 link where 4 bits of signaling per timeslot are
multiplexed into timeslot 16.
cell delay variation
cell delay variation tolerance
CDVT is the upper limit of allowable cell delay variation. When cells from
two or more ATM connections are multiplexed, cells of an ATM connection
may be delayed while cells of another ATM connection are inserted at the
output of the multiplexer. Similarly, some cells may be delayed while
physical layer overhead or OAM cells are inserted.
circuit emulation
committed information rate
The CIR is the guaranteed minimum throughput between two end-user
devices over the frame relay network, under normal operating
circumstances.
cell loss priority
The CLP is a one-bit field in the ATM cell header that indicates the loss
priority of an individual cell.
central office
customer premises equipment
control packet switching system
A CPSS is a proprietary network protocol for communication between
equipment. Similar to X.25, CPSS is a packet-switched system used to
transfer configuration and status information between nodes.
cyclic redundancy check
A CRC is a process used to check the integrity of a block of data.
Speed Touch 591s Technical Practices
90-8785-01
February 2001
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