HP auroraTempo User Manual page 275

or where transmission channels are connected. Node is often
used instead of workstation.
NSAP Network Service Access Point.
A digital unit of information comprising eight binary digits
Octet
(bits).
Office Channel Unit. This is switching equipment which
OCU
connects the line from customer premises to the Frame Relay
network.
OSI Reference This is a seven layer model, defined by the International
Standardization Organization, in which functions are
Model
broken up into clearly defined layers.
Private Automatic Branch eXchange.
PABX
A collection of bits, including address, data and control
Packet
information, which are transmitted together.
A simple mechanism for determining if a single bit error has
Parity
occurred when individual characters are transmitted.
Transmission method in which data is formed into
Packet
discrete segments, usually with its own control
Switching
information, and is routed through the network in this
envelope, referred to as a packet. Packets occupy a
communication channel for a short duration, so packets
from several users can share a channel.
Packet Assembler/ Disassembler. A device used in a packet
PAD
switched network to assemble and disassemble data into the
required format. The PAD is also responsible for call setup
and addressing routines.
PC Personal Computer.
Issue 1a - 10/99
Appendix 4 - Glossary
A4 - 9