Cabletron Systems 3E08-04 User's Guide download pdf (Page 228)

D-16

Glossary

optical transmitter

A circuit that converts an electrical signal to an optical signal.

OSI (Open Systems Interconnection)

Refers to the OSI reference model, a logical structure for network

operations. OSI is the internationally accepted framework of

standards for internetwork communication.

packet

A group of bits including data and control elements arranged in a

speciﬁc format that are transmitted and switched as a composite

whole. Control elements include a source address, destination

address, frame control and status indicators and a frame check

sequence (FCS).

packet processing engine module

High-performance component of the ATX bridge capable of

performing packet analysis/transfer at a high rate.

PDU (protocol data unit)

The portion of a datagram that contains the data associated with a

particular protocol.

peer-to-peer

Term used to describe data transmission between entities in the

same sublayer of the OSI model.

PHY (Physical Layer Protocol)

FDDI standard that deﬁnes symbols, line states, clocking

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Cabletron Systems 3E08-04 User's Guide Page 228