Glossary
GL-12
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Line terminating equipment (LTE)
Refers to line cards which terminate the line signal in the ONS 15454.
Line timing mode
A node that derives its clock from the SONET lines.
Link budget
The difference between the output power and receiver power of an optical signal expressed in dB. Link refers to an optical
connection and all of its component parts (optical transmitters, repeaters, receivers, and cables).
Link integrity
The network communications channel has link integrity if it is intact.
LOF
Loss of Frame.
Loopback test
Test that sends signals then directs them back toward their source from some point along the communications path. Loopback
tests are often used to test network interface usability.
LOP
Loss of Pointer.
LOS
Loss of Signal.
LOW
(Local Orderwire). A communications circuit between a technical control center and selected terminal or repeater locations.
LTE
Line Terminating Equipment.
LVDS
Low-Voltage Differential Signal.
M
MAC
Media Access Control.
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