Glossary
GL-22 Issue 3 June 2000
VT1.5
A 1.728 Mb/s virtual tributary
VT-G
Virtual Tributary Group — A 9-row by 12-column SONET structure (108 bytes) that carries one or
more VTs of the same size. Seven VT groups (756 bytes) are byte-interleaved within the VT-orga-
nized STS-1 synchronous payload envelope.
W
WAN
Wide Area Network
Z
Zero Code Suppression
A technique used to reduce the number of consecutive zeros in a line-codes signal (B3ZS for DS3
signals and B8ZS for DS1 signals).
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