Lucent Technologies LambdaUnite Installation Manual page 329

frame, but not yet provisioned.
ES (Errored Seconds)
A performance monitoring parameter. ES "type A" is a second with exactly one error; ES "type
B" is a second with more than one and less than the number of errors in a severely errored
second for the given signal. ES by itself means the sum of the type A and type B ESs.
ESD
Electrostatic Discharge
ESP
Electrostatic Protection
Establish
A user initiated command, at the LambdaUnite CIT, to create an entity and its associated
attributes in the absence of certain hardware.
ETSI
European Telecommunications Standards Institute
Event
A significant change. Events in controlled Network Elements include signal failures, equipment
failures, signals exceeding thresholds, and protection switch activity. When an event occurs in a
controlled Network Element, the controlled Network Element will generate an alarm or status
message and send it to the management system.
Event Driven
A required characteristic of network element software system: NEs are reactive systems,
primarily viewed as systems that wait for and then handle events. Events are provided by the
external interface packages, the hardware resource packages, and also by the software itself.
Externally Timed
An operating condition of a clock in which it is locked to an external reference and is using
time constants that are altered to quickly bring the local oscillator's frequency into approximate
agreement with the synchronization reference frequency.
Extra traffic
Unprotected traffic that is carried over protection channels when their capacity is not used for
the protection of working traffic.
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F Fault
Term used when a circuit pack has a hard (not temporary) fault and cannot perform its normal
function.
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Issue a, January 2002
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