Lucent Technologies LambdaUnite Installation Manual page 336

Line Protection
The optical interfaces can be protected by line protection. Line protection switching protects
against failures of line facilities, including the interfaces at both ends of a line, the optical
fibers, and any equipment between the two ends. Line protection includes protection of
equipment failures.
Line Timing
Refers to a network element that derives its timing from an incoming STM-N signal.
Link
The mapping between in-ports and out-ports. It specifies how components are connected to one
another.
LL
Lucent Learning (former CTIP)
LO
Low Order
Location
An identifier for a specific circuit pack, interface module, interface port, or communications
link.
Lockout of Protection
The LambdaUnite CIT command that prevents the system from switching traffic to the
protection line from a working line. If the protection line is active when a "Lockout of
Protection" is entered – this command causes the working line to be selected. The protection
line is then locked from any Automatic, Manual, or Forced protection switches.
Lockout State
The Lockout State shall be defined for each working or protection circuit pack. The two
permitted states are: None – meaning no lockout is set for the circuit pack, set meaning the
circuit pack has been locked out. The values (None & Set) shall be taken independently for
each working or protection circuit pack.
LOF (Loss of Frame)
A failure to synchronize an incoming signal.
LOM
Loss Of Multiframe
Loop Timing
A special case of line timing. It applies to network elements that have only one OC-N/STM-N
interface. For example, terminating nodes in a linear network are loop timed.
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G L O S S A R Y
G L - 2 0
Lucent Technologies 365-374-059
Issue a, January 2002