Glossary
GL-22 Issue 8.0 July 2002
V
Val ue
A number, text string, or other menu selection associated with a parameter.
VF Circuit
Voice Frequency Circuit — A 64-kb/s digitized signal.
VM
Violation Monitor — A provisionable mode for the DS3 output that causes parity violations to be
monitored but not corrected before the DS3 signal is B3ZS encoded.
VMR
Violation, Monitor, and Removal — A provisionable mode for the DS3 output that causes parity
violations to be monitored and corrected before the DS3 signal is B3ZS encoded.
VT
Virtual Tributary — A structure designed for transport and switching of sub-STS-1 payloads. There
are currently four sizes: VT1.5 (1.728 Mb/s), VT2 (2.304 Mb/s), VT3 (3.456 Mb/s), and VT6 (6.912
Mb/s).
VT-G
Virtual Tributary Group — A 9-row by 12-column structure (108 bytes) that carries one or more VTs
of the same size. Seven VT groups (756 bytes) are byte interleaved with the VT-organized syn-
chronous payload envelope.
W
Wander
The wander of a digital signal is defined as the
long term
variations of the significant instants of a
digital signal from their ideal positions in time.
WDM
Wavelength Division Multiplexing.
Wideband Communications
Voice, data, and/or video communications from the DS0 rate (64 kb/s) to the DS1 rate (1.544 Mb/s).
Z
Zero Code Suppression
A technique used to reduce the number of consecutive zeros in a line-codes signal (B3ZS for DS3
signals).
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