Output (MDIO) Module User's Guide

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Appendix A

Link— The transmission path between any two instances of generic cabling.

Multicast MAC Address— A class of MAC address that sends a packet to potentially more than one

recipient. A group address is specified by setting the LSB of the first MAC address byte to 1.

Thus, 01h-02h-03h-04h-05h-06h is a valid multicast address. Typically, an Ethernet MAC looks

for only certain multicast addresses on a network to reduce traffic load. The multicast address list

of acceptable packets is specified by the application.

Physical Layer and Media Notation— To identify different Ethernet technologies, a simple, three-field,

type notation is used. The Physical Layer type used by the Ethernet is specified by these fields:

The definitions for the technologies mentioned in this document are in Table A-1 .

Table A-1. Physical Layer Definitions

Term Definition

10Base-T IEEE 802.3 Physical Layer specification for a 10 Mb/s CSMA/CD local area network over two pairs of

twisted-pair telephone wire.

100Base-T IEEE 802.3 Physical Layer specification for a 100 Mb/s CSMA/CD local area network over two pairs of

Category 5 unshielded twisted-pair (UTP) or shielded twisted-pair (STP) wire.

Twisted pair A cable element that consists of two insulated conductors twisted together in a regular fashion to form a

balanced transmission line.

Port— Ethernet device.

Promiscuous Mode— EMAC receives frames that do not match its address.

134 Glossary SPRUEQ6 – December 2007

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