Cisco 6400 Guia de preparacion descargar pdf (Pagina 184)

Glossary

GL-10

Cisco 6400 Software Setup Guide

OL-1183-04

PCR peak cell rate. Parameter defined by the ATM Forum for ATM traffic management. In CBR

transmissions, PCR determines how often data samples are sent. In ABR transmissions, PCR

determines the maximum value of the ACR.

PEM

power entry module. The PEM converts the -48 VDC power voltage into the voltages used internally

by the Cisco 6400. The Cisco 6400 is designed to operate on one or two PEM units.

ping packet internet groper. ICMP echo message and its reply. Often used in IP networks to test whether a

network device destination can be reached from the source.

PLCP physical layer convergence procedure. Specification that maps ATM cells into physical media, such as

T3 or E3, and defines certain management information.

PNNI

1. Private Network-Network Interface. ATM Forum specification for distributing topology information

between switches and clusters of switches that is used to compute paths through the network. The

specification is based on well-known link-state routing techniques and includes a mechanism for

automatic configuration in networks in which the address structure reflects the topology.

2. Private Network Node Interface. ATM Forum specification for signaling to establish point-to-point

and point-to-multipoint connections across an ATM network. The protocol is based on the ATM Forum

UNI specification with additional mechanisms for source routing, crankback, and alternate routing of

call setup requests.

point-to-multipoint

connection

One of two fundamental connection types. In ATM, a point-to-multipoint connection is a unidirectional

connection in which a single-source end system (known as a root node) connects to multiple destination

end systems (known as leaves). Compare with point-to-point connection.

point-to-point

connection

One of two fundamental connection types. In ATM, a point-to-point connection is a connection

between two endpoints. Compare with point-to-multipoint connection.

POP point of presence. Physical location within a LATA where a long distance carrier or cellular provider

interfaces with the network of the local exchange carrier (LEC), also called the local telephone

company.

POTS plain old telephone service. See PSTN.

power-on servicing

Feature that allows faulty components to be diagnosed, removed, and replaced while the rest of the

device continues to operate normally. Sometimes abbreviated POS. Sometimes called hot swapping.

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Cisco 6400 Guia de preparacion Pagina 184