Lucent Technologies FT-2000 OC-48 - Page 892

Glossary
GL-6 Issue 8.0 July 2002
DCC Link
Data Communications Channel Link — A bidirectional point-to-point fiber connection at the OC-3
(Release 6 or later) or OC-48 rate that has the DCC bytes terminated at both ends.
DCE
Data Circuit Equipment — The equipment that provides the signal conversion and coding between
the data terminating equipment and the line. The DCE may be separate equipment or a part of the
data terminating equipment.
DCMS
Design Change Management System — The Design Change Management System is used to issue
product change notifications (PCNs) to customers.
DDM-2000
Lucent Technologies SONET-ready network multiplexer that can function as a lightwave terminal. It
is designed primarily for loop feeder and interoffice applications that will work in existing asynchro-
nous as well as the emerging SONET networks.
DDM-FiberReach
The DDM-2000 FiberReach Multiplexer is an OC-1 low density access product offering DS0 and
DS1 services for business carrier access, fiber-in-the-loop, or private network applications.
DDM-2000 FiberReach is hosted by the DDM-2000 OC-3 or OC-12 Multiplexer or the
SLC -2000
Access System with a single- or dual-homed ring or star topology.
DWDM
Dense Wave Division Multiplexing — Transmitting multiple OC-48 optical signals (simultaneously)
over a single fiber. The DWDM signal is interface compatible with the OLS product.
Demultiplexing
A process applied to a multiplexed signal for recovering signals combined within it and for restoring
the distinct individual channels of these signals.
Destination Node
The destination node is the node in a ring where the low speed signals on an STS-3 tributary termi-
nate. If an STS-3 tributary is bridged at one or more nodes in a ring, the last node where the low
speed signals are terminated is the destination node. The destination node and source node of an
STS-3 tributary are always in the same ring (also see Source Node).
DFB
Distributed Feedback.
DM
Degraded Minutes — A performance-monitoring parameter.
DMA
Direct Memory Access — A data transfer technique that uses a control circuit to move data
between a device and memory.
DPLL
Digital Phase-Locked Loop.