Lucent Technologies Metropolis DMXplore, Руководство по установке

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G L O S S A R Y
G L - 2 7
365-372-334 R2.0
Issue 4, November 2004
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RT - Remote Terminal
An unstaffed equipment enclosure that may have a controlled or uncontrolled
environment.
S Self-Healing
Ring architecture in which two or more fibers are used to provide route diversity.
Node failures only affect traffic dropped at the failed node.
SEO - Single-Ended Operations
The maintenance capability that provides remote access to all Metropolis
®
DMXplore systems from a single location over the DCC.
Service Line
On a Metropolis
®
DMXplore system, a service (or "working") line is a pair of
fibers (one transmit and one receive) that terminate on an OLIU circuit pack in the
Main-1 or C-1 slots. As defined by the SONET standard, the SONET APS channel
is not defined on a service line. See Protection Line.
SES - Severely Errored Seconds
This performance monitoring parameter is a second in which a signal fail occurs,
or more than a preset amount of coding violations (dependent on the type of signal)
occurs.
SF - Super Frame
The format for DS1 signals.
Single Homing
A network topoly in which a single Metropolis
®
DMXplore serves as a DDM-2000
FiberReach, OC-3 Multiplexer, or OC-12 Multiplexer host.
Standby
Standby identifies a 1+1 protected OC-N line which is not currently selected by the
receiver at either end as the payload carrying signal, or 1x1 or 1xN protected circuit
pack that is not currently carrying service. See Active.
Status
The indication of a short-term change in the system.
STS, STS-n - Synchronous Transport Signal
The basic building block signal with a rate of 51.840 Mb/s for an STS-1 signal and
a rate of n times 51.840 Mb/s for an STS-n signal.
STS-1 SPE - STS-1 Synchronous Payload Envelope
A 125-microsecond frame structure composed of STS path overhead and the STS-
1 payload.