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Glossary
Terms and Definitions
G L - 3 0
Lucent Technologies - Proprietary
See notice on first page
365-372-327 R2.0
Issue 1, October 2003
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U
UAS - Unavailable Seconds
In performance monitoring, the count of seconds in which a signal is declared
failed or, in which, 10 consecutively severely errored seconds (SES) occurred,
until the time when 10 consecutive non-SES occur.
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.
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
