6OPERATION GLOSSARY
PMD standardPhysical Layer Medium Dependent standard. An American National Standard
(ANSI X3) that speciŢes the lower sublayer of the physical layer for FDDI,
including the power levels and characteristics of the optical transmitter and
receiver; interface optical signal requirements including jitter; the connector
receptacle footprint; the requirements of conforming FDDI optical Ţber
cable plants; and the permissible bit error rates.
primary ringOne of two counter-rotating, Ţber optic rings that serve as the root of an
FDDI network. The primary ring normally enters each station on the trunk
ring through the A port and exits through the B port. See also secondary
ring.
protocolA set of rules for communicating between computers. The rules dictate
format, timing, sequencing, and error control.
proxy agentActs as a management gateway, converting requests and event reports
from one protocol and object format to another protocol and object format.
RS-232 serial portThe port on the system accepting a DB-9 or modem connector. It changes
the parallel arrangement of data within computers to the serial (one after
the other) form used on data transmissions links. This port can be used for
dedicated local management access.
SASSingle attachment station. A station that offers one attachment to the FDDI
network. A SAS has an S port to be attached to an M port within a
concentrator tree.
secondary ringOne of two counter-rotating, Ţber optic rings that serve as the root of an
FDDI network. The secondary ring normally enters each station on the trunk
ring through the B port and exits through the A port. See also primary ring.
serverA computer that provides clients with application and network services.
Servers are shared by multiple users.
SMTStation Management. A component of the FDDI standard that speciŢes the
control required for proper operation of a station in an FDDI ring.
SNMPSimple Network Management Protocol. A protocol originally designed to
be used in managing TCP/IP internets. SNMP is presently implemented on a
wide variety of computers and networking equipment and may be used to
manage many aspects of network and end-station operation. See also
protocol. |
ACEC
