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Glossary
Terms and Definitions
G L - 2 8
Lucent Technologies - Proprietary
See notice on first page
365-372-327 R2.0
Issue 1, October 2003
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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
®
DMXtend systems from a single location over the DCC.
Service Line
On a Metropolis
®
DMXtend 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, D-1, or G-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.
SFP
Small Form-Factor Pluggable optics.
Shelf ID
A switch-settable parameter with values from 1 to 8. Used to log into a selected
shelf by using the CIT.
Single 0x1 Cross-Connection
In a dual-homed application, the Metropolis
®
DMXtend uses a single 0x1
cross-connection to map the VT1.5 channels between the DDM-2000
FiberReach, OC-3 Multiplexer, or OC-12 Multiplexer and the Metropolis
®
DMXtend rings. This single 0x1 architecture maps low speed to high speed on
a specified ring rotation. The high speed to low speed drop is made on the same
specified ring with no path switching. Protection is provided at the VT1.5 end
points.
Single Homing
A network topoly in which a single Metropolis
®
DMXtend serves as a DDM-
2000 FiberReach, OC-3 Multiplexer, or OC-12 Multiplexer host supporting up
to eight OC-3 or four OC-12 rings.