Directory-Service Network Element (DSNE)
A designated network element that is responsible for administering a database that maps
network element names (node names) to addresses (node Id). There can be one DSNE
per (sub)network.
Disassembly
Splitting up of a signal into its constituents as payload data and overhead (an indication
of the direction of a signal).
Domain
The domain of a Lucent NMS is the set of all SDH network elements that are controlled
by it.
Downstream
At or towards the destination of the considered transmission stream, i.e. in the direction
of transmission.
DPS
Data communication Packet Switch
DRI
Dual-Ring Interworking
DS-n
Digital Signal, Level n
DSL
Digital Subscriber Line
DTMF
Dual-Tone Multi-Frequency
Dual Homing
An STM-1/STM-4 ring with AM-1 Plus equipment can be dual homed on a ring
consisting of Metropolis
®
AMU, Metropolis
®
ADM (Compact shelf) or WaveStar
®
ADM
16/1. STM-16 rings can also be dual homed with the Metropolis
®
AMU.
Dual-Node Interworking
Dual Node Interworking (DNI) is a configuration of two ring networks that share two
common nodes. DNI allows a circuit with one termination in one ring and one
termination in another ring to survive a loss-of-signal failure of the shared node that is
currently carrying service for the circuit.
DUS
Do not Use for Synchronization
DWDM
Dense-Wavelength Division Multiplexing
Glossary
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365-312-847R4.0
Issue 4, November 2006
Lucent Technologies - Proprietary
See notice on first page
GL-7