Alcatel-Lucent 1665 Installation Manual page 363

Terms and definitions
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Unidirectional
A protection switching mode in which the system at each end of an optical span monitors both
service and protection lines and independently chooses the best signal (unless overridden by an
equipment failure or by an external request, such as a forced switch or lockout). In a system that
uses unidirectional line switching, both the service and protection lines may be active
simultaneously, with one line carrying traffic in one direction and other line carrying traffic in the
other direction. For a 1+1 protection scheme the K1 and K2 bytes in the SONET line overhead are
used to convey to the far end which line the near-end receiver has chosen, so that an "active"
indication may be made at the far end.
UOC - Univeral Optical Connector
Receptacles on the faceplate of some OLIUs that accept ST, SC, or FC connectors.
UPD/INIT
A push-button on the SYSCTL faceplate.
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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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Alcatel-Lucent 1665 DMXtend R10.0
365-372-327R10.0 Issue 1
January 2013
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