Agilent Technologies AuroraPresto, User Manual

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Glossary & Abbreviations
Issue 7 - 05/02 Glossary-9
A B C D E F G H I
J K
L N O P Q R S T U V W X
Y Z
Physical Layer
The first layer in the OSI Model. It specifies the
physical interface (for example connectors, voltage
levels, cable types) between a user device and the
network.
Ping
The IP Ping procedure. This lets you test for the
presence of a remote device on a network.
POTS
Plain Old Telephone Service. POTS is recognised
around the world to mean the basic analogue
telephone service.
PPD
Partial Packet Discard.
PPP
Point-to-Point Protocol is a protocol used to
communicate across networks that use different
protocols.
PPPoA
Point-to-Point Protocol over ATM. This used over an
ADSL connection.
PPPoE
Point-to-Point Protocol over Ethernet. This used over
an Ethernet connection.
PSD
Power Spectral Density.
PTT
National Postal, Telephony and Telegraphy
administration.
PVC
Permanent Virtual Circuit/Connection. This a
permanent circuit, route or link in which the routes
between two endpoints are defined during network
setup. PVCs are used mainly for Wide Area Networks
(WANs). A fixed virtual circuit between two users.
Q
QoS
Quality of Service.
481801-7.book Page 9 Thursday, May 23, 2002 10:46 AM