Switch User's Manual

26 D
dense wavelength division multiplexing (DWDM)
A technology that uses many optical signals
(16 or more) with different wavelengths to
simultaneously transmit in the same direction
across one fiber, and then separates by
wavelength at the distant end.
demultiplexing
The wavelength separation in a wavelength-
division multiplexing system. The opposite of
multiplexing.
designated router (DR)
A single router elected as the designated router
for the network. In a broadcast or nonbroadcast
multiple access (NBMA) network running the
Open Shortest Path First (OSPF) protocol, a DR
ensures all network routers synchronize with
each other and advertises the network to the rest
of the autonomous system (AS). In a multicast
network running Protocol Independent Multicast
(PIM), the DR acts as a representative router for
directly connected hosts. The DR sends control
messages to the rendezvous point (RP) router,
sends register messages to the RP on behalf of
directly connected sources, and maintains RP
router status information for the group.
Device Manager (DM)
A graphical user interface (GUI) used to
configure and manage the Nortel Ethernet
Routing Switch 8600.
DiffServ (DS) boundary or access point
The edge of a DS domain in which classifiers
and traffic conditioners are deployed.
DS field
Formerly called the IPv4 Type of Service (TOS)
octet or the IPv6 Traffic Class octet. The DS
field provides the Differentiated Services Code
Point (DSCP) that is used for packet forwarding.
These fields are part of the standard IPv4
header.
Nortel Ethernet Routing Switch 8600
Terminology
NN46205-102 01.01 Standard
30 May 2008
Copyright © 2008 Nortel Networks
.