Appendix A

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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:

<data rate in Mb/s><medium type><maximum segment length (×100m)>

The definitions for the technologies mentioned in this document are in Table 87.

 

Table 87. 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

SPRUFL5B –April 2011

 

 

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Texas Instruments TMS320C674X manual Physical Layer Definitions, Term Definition