Digital Equipment DECconcentrator 500, Руководство по установке, Страница: 90 / 98

Glossary–4
Physical Media Dependent
A media-dependent FDDI protocol that provides for the medium, connector, and
transmit and receive power levels.
PMD
See Physical Media Dependent.
port
An entrance to or exit from a network; also an access point for data entry or exit.
Port Card
An option card for the concentrator that provides the connection to single attach-
ments. The Port Card conforms to the ANSI X3T9 standard and has type-M connec-
tors.
processor
The functional part of the concentrator controller/backplane that uses instructions to
perform computation or manipulate data.
receive
The act of a station accepting a frame, token, or control sequence from the ring.
repeater
A level 1 hardware device that performs the basic actions of restoring signal ampli-
tude, waveform, and timing of signals, before transmission onto another network
segment.
ring
Connection of two or more stations in a circular logical topology. Information is
passed sequentially between active stations, each one in turn examining or copying
the data, and finally returning it to the originating station, which removes it from the
network.
SAC
See Single Attachment Concentrator.
SAS
See Single Attachment Station .
Single Attachment Concentrator
A concentrator that offers one S port for attachment to the FDDI network and M ports
for the attachment of stations or other concentrators.
Single Attachment Station
An FDDI station that offers one S port for attachment to the FDDI ring.