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 a ddress 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 transmit ted with t he da ta
and the receiver uses this information and the same algorithm to insur e 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.