Glossary
C
Centillion 1200N ATM Switch User Manual
B-17
NTP 297-8103-903
CLP
Cell Loss Priority: This bit in the ATM cell header indicates two levels of priority
for ATM cells. CLP=0 cells are higher priority than CLP=1 cells. CLP=1 cells may
be discarded during periods of congestion to preserve the CLR of CLP=0 cells.
CLR
Cell Loss Ratio: CLR is a negotiated QoS parameter and acceptable values are
network specific. The objective is to minimize CLR provided the end-system
adapts the traffic to the changing ATM layer transfer characteristics. The Cell Loss
Ratio is defined for a connection as: Lost Cells/Total Transmitted Cells. The CLR
parameter is the value of CLR that the network agrees to offer as an objective over
the lifetime of the connection. It is expressed as an order of magnitude, having a
range of 10-1 to 10-15 and unspecified.
CMIP
Common Management Interface Protocol: An ITU-TSS standard for the message
formats and procedures used to exchange management information in order to
operate, administer maintain and provision a network.
CMR
Cell Misinsertion Rate: The ratio of cells received at an endpoint that were not
originally transmitted by the source end in relation to the total number of cells
properly transmitted.
CNR
Complex Node Representation: A collection of nodal state parameters that provide
detailed state information associated with a logical node.
COD
Connection Oriented Data: Data requiring sequential delivery of its component
PDUs to assure correct functioning of its supported application, (e.g., voice or
video).
COM
Continuation of Message: An indicator used by the ATM Adaptation Layer to
indicate that a particular ATM cell is a continuation of a higher layer information
packet which has been segmented.
Common Peer Group
The lowest level peer group in which a set of nodes is represented. A node is
represented in a peer group either directly or through one of its ancestors.
