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Glossary C
Centillion 1200N ATM Switch User Manual B-19
NTP 297-8103-903
CPCS-SDU
Common Part Convergence Sublayer-Service Data Unit: Protocol data unit to be
delivered to the receiving AAL layer by the destination CP convergence sublayer.
CPE
Customer Premises Equipment: End user equipment that resides on the customer's
premise which may not be owned by the local exchange carrier.
CPN
Calling Party Number: A parameter of the initial address message that identifies
the calling number and is sent to the destination carrier.
CPU
Central Processing Center: The "brian" of the computer.It manipulates data and
processes instructions coming from software or a human operator.
Crankback
A mechanism for partially releasing a connection setup in progress which has
encountered a failure. This mechanism allows PNNI to perform alternate routing.
CRC
Cyclic Redundancy Check: A mathematical algorithm that computes a numerical
value based on the bits in a block of data. This number is transmitted with the data
and the receiver uses this information and the same algorithm to insure the accurate
delivery of data by comparing the results of algorithm and the number received. If
a mismatch occurs, an error in transmission is presumed.
CRF
Cell Relay Function: This is the basic function that an ATM network performs in
order to provide a cell relay service to ATM end-stations.
CRF
Connection Related Function: A term used by Traffic Management to reference a
point in a network or a network element where per connection functions are
occurring. This is the point where policing at the VCC or VPC level may occur.
CRM
Missing RM-cell count: CRM limits the number of forward RM-cells which may
be sent in the absence of received backward RM-cells.