Lucent Technologies LambdaUnite Installation Manual page 358

Variable
An item of data named by an identifier. Each variable has a type, such as int or Object, and a
scope.
VC (Virtual Container)
Container with path overhead.
VDC
Volts Direct Current
VF
Voice frequency
Virtual
Refers to artificial objects created by a computer to help the system control shared resources.
Virtual Circuit
A logical connection through a data communication (for example, X.25) network.
Voice Frequency (VF) Circuit
A 64 kilobit per second digitized signal.
Volatile Memory
Type of memory that is lost if electrical power is interrupted.
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W WAD
Wavelength Add/Drop
WAN (Wide Area Network )
A communication network that uses common-carrier provided lines and covers an extended
geographical area.
Wander
Long term variations of amplitude frequency components (below 10 Hz) of a digital signal from
their ideal position in time possibly resulting in buffer problems at a receiver.
Wavelength Interchange
The ability to change the wavelength associated with an STM-N signal into another wavelength.
WDCS
Wideband Digital Cross-Connect System
WDM (Wavelength Division Multiplexing)
A means of increasing the information-carrying capacity of an optical fiber by simultaneously
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G L O S S A R Y
G L - 4 2
Lucent Technologies 365-374-059
Issue a, January 2002