Verilink AS2000: The Basics (880-502981-001) Product Manual - Manual (Page 149)

Acronyms and Definitions
Verilink Access System 2000: Basics Glossary-29
L
LAN See Local Area Network .
LBO See line build-out .
LCV Line Coding Violation. A count of
both bipolar violations and
excessive zeros (greater than three
contiguous zeros) in DS3 services.
LED See light emitting diode .
LES Line Errored Second. A second in
which one or more LCV s occurred
OR one or more LOS defects.
light emitting diode An LED is a device that lights up
when the proper current is passed
through it. It is used on Verilink
modules for identifying power,
loops, errors, and other
conditions.
line build-out LBO is the attenuation signal
strength used by the CSU to the T1
network interface—determined by
the distance from the CSU to the
first line repeater. Choose: --0 db—
if your repeater is between 2000
and 3000 feet from the CSU, or if a
smart jack is used: -- -7.5 db—if
your repeater is between 1999 and
1000 feet from the CSU. -- -15 db—
if your repeater is between 999
and 250 feet from the CSU.-- -22.5
db—if your repeater is between 0
and 249 feet from the CSU.
line code violation See code violation—line (CV-L).
line coding Technique used for encoding
binary data onto a T1/E1. Choices
are AMI or B8ZS for T1, B3ZS for
E1.
line loopback An LLB is a loop which takes the
signal from the network and loops
it back toward the network. The
loop does not allow the network
signal to pass through the CSU
(except for critical protection
circuitry and the repeater), making
it useful for testing the network
line.