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Terms and definitions
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V
VM - Violation Monitor
A mode of the DS3 circuit pack in which it will monitor but not remove P-bit parity violations on
the DS3 signal from the received fiber.
VMR - Violation Monitor and Removal
A mode of the DS3 circuit pack in which it will monitor and remove P-bit parity violations on the
DS3 signal received from the fiber.
VT - Virtual Tributary
A structure designed for transport and switching of a sub-DS3 payload.
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-organized STS-1 synchronous
payload envelope
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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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GL - 2 8
365-372-603R2.0
Issue 1 January 2009
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