Black Box COMPACT T1 MT850A - Manual (Page 569)

Compact T1 - Release 6.1 Glossary-11
Glossary
PHY
PHY PHY as in physical specifications. OSI Physical Layer, which provides
for transmission of cells over a physical medium connecting two ATM
devices.
ping Packet InterNet Grouper. PING is a program used to test whether a
particular network destination on the Internet is online (i.e. working) by
repeatedly bouncing a "signal" off a specified address and seeing how
long that signal takes to complete the round trip. No return signal - site is
down or unreachable. Portion is returned - trouble with the connection.
PLAR Private Line, Automatic Ringdown. A leased voice circuit that connects
two single instruments together. When either handset is lifted, the other
instrument automatically rings.
PPP Point-to-Point Protocol.
protocol Procedure or set of rules.
PVC Permanent Virtual Circuit. A PVC is a permanent channel connection
between two ATM devices. PVC’s allow network transmissions to be
started without having to first establish a connection with the end point
ATM device. When a PVC is constructed, the end points of the
connection will agree upon a path in which data will travel, and therefore
agree upon the route that data will travel to reach its destination.
QoS Quality of Service.
RADIUS Remote Authentication Dial-In Service. RADIUS is a client/server-
based authentication software system. The software supports remote
access applications, allowing an organization to maintain user profiles in
a centralized database residing on an authentication server which can be
shared by multiple remote access servers.