Packet Switching A network technique that divides user messages into relatively
short blocks and uses geographically distributed switching
nodes, to achieve low end-to-end delay for real-time, bursty data
traffic.
PC Personal Computer.
Permanent Virtual Circuit (PVC)
A virtual circuit established for the duration of an agreement
between the subscriber and the network authority and is
available to send packets in either direction at any time. It has
all the features of a virtual call without the call setup and
release procedures.
PIDB A Peripheral Interface Data Bus (PIDB) is an interface in the
ISLU2 that provides PSU2 timing and a path to other switching
modules and carries circuit switched information from the SG to
the TSI (MCTU3).
Protocol A set of rules for conducting interactions between two or more
entities. These rules consist of syntax (for example, header
structure), semantics (the actions and reactions that are
supposed to occur), and timing (the relative ordering and
duration of events and states).
PSTN Public Service Telephone Network.
PSU2 Packet Switch Unit 2.
PTN Packet Transport Network.
Random Routing Routing technique that moves information through the network
in a statistically random matter.
Recent Change (RC) This system function allows maintenance personnel access to
the DRM database. Recent change is used to add to or delete
from databases and update or verify the database using
select/mark format.
Recovery Procedures
A set of actions designed to restore a device to normal
operations.
Retrofit The ability to upgrade a DRM without impairing service to the
subscriber.
ROP Receive-Only Printer.
Routing The process of finding a suitable path to move information
through the network. (See Adaptive Directory Routing,
Directory Routing, and Random Routing.)
Routing Table A set of instructions stored at each switch indicating the path to
move a given packet to a given destination.
RS232 (RS232C) Technical specifications set by the Electronic Industries
Association (EIA) which define electrical and mechanical
interfaces between terminals, modems, computer, and
communications lines.
SAI Serial Asynchronous Interface.
SCANS Software Change Administration and Notification System.
235-200-150
May 2003
GLOSSARY
Issue 3.00 Page G-9
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