Agilent Technologies AuroraPresto, User Manual

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Glossary & Abbreviations
Issue 7 - 05/02 Glossary-7
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
ITU-T
International Telecommunications Union - an
international organisation that develops standards
and defines interfaces for telecommunications
systems. Formerly known as the CCITT.
L
LAN
Local Area Network - a system consisting of computer
and communications hardware and software
connected by a common transmission medium,
usually limited to a scope of a few miles.
Layer 1
The physical layer of the Open Systems
Interconnection (OSI) reference model for example an
ADSL line.
LB
Loopback.
LCP
Link Control Protocol.
Link
Any physical connection on a network between two
separate devices, such as an ATM switch and its
associated end point or end station.
LLC SNAP
Logical Link Control, Sub Network Address Protocol
is a protocol used in IP Encapsulation.
LOF
Loss of Frame - a condition at the receiver or a
maintenance signal transmitted in the physical
framing indicating that the receiving equipment has
lost frame delineation. This is used to monitor the
performance of the physical layer.
Loop
A loop is used to redirect data. There are two types of
loop - remote and local.
LOS
Loss of Signal - a condition at the receiver or a
maintenance signal transmitted in the PHY overhead
indicating that the receiving equipment has lost the
received signal. This is used to monitor the
performance of the physical layer.
481801-7.book Page 7 Thursday, May 23, 2002 10:46 AM