Alcatel-Lucent Data Multiplexer Explore 1665, Руководство по установке

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365-372-304R7.1
Issue 1, November 2007
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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
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).