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Glossary

GL-8

Cisco 6400 Software Setup Guide

OL-1183-04

M23 A method of multiplexing four DS1 signals into a DS2 signal, then multiplexing seven DS2 signals into

a DS3 signal.

MAC

Media Access Control. Lower of the two sublayers of the data link layer defined by the IEEE. The MAC

sublayer handles access to shared media.

Mbps megabits per second.

MBS maximum burst size. In an ATM signaling message, burst tolerance is conveyed through the MBS,

which is coded as a number of cells. The burst tolerance together with the SCR and the GCRA

determine the MBS that can be transmitted at the peak rate and still be in conformance with the GCRA.

See also SCP and GCRA.

MCR

minimum cell rate. Parameter defined by the ATM Forum for ATM traffic management. MCR is

defined only for ABR transmissions, and specifies the minimum value for the ACR.

MIB Management Information Base. Database of network management information that is used and

maintained by a network management protocol such as SNMP or CMIP. The value of a MIB object can

be changed or retrieved using SNMP or CMIP commands, usually through a GUI network management

system. MIB objects are organized in a tree structure that includes public (standard) and private

(proprietary) branches.

MTU maximum transmission unit. Maximum packet size, in bytes, that a particular interface can handle.

multimode fiber

Optical fiber supporting propagation of multiple frequencies of light. See also single-mode fiber.

mux multiplexing device. Combines multiple signals for transmission over a single line. The signals are

demultiplexed, or separated, at the receiving end.

NAS network access server. A device providing local network access to users across a remote access network

such as the PSTN.

NCP

Network Control Protocol. Series of protocols for establishing and configuring different network layer

protocols, such as for AppleTalk over PPP.

NEBS Network Equipment Building Systems. A standard set of physical and electrical requirements for

telecommunications equipment intended for installation in the telephone company central office

environment. NEBS requirements are specified in various Bellcore documents.

NLC node line card. One of the component cards used in the Cisco 6400. These cards provide the interfaces

for moving data into and out of the Cisco 6400 system. They can be used as either uplink or downlink

interfaces. Different types of node line cards support different transmission protocols and data rates.

NME

network management Ethernet. The local area network used to control and manage equipment in a

central office and branch locations. The NME connection on the Cisco 6400 is an RJ-45 connector for

a 10BaseT port on the NSP module.

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Cisco 6400 Guia de preparacion Pagina 182