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List of terms

DR

See designated router (DR) (page 41).

default gateway

The gateway used to reach a destination if no other route is known or provided.

Defense Network Secure Information Exchange (DNSIX)

A protocol defined in RFC 1038 and RFC 1108 for passing confidential data securely over a network.

delta channel (D-channel)

A bidirectional channel, also known as the D-channel, used to carry call control messages and signaling information over ISDN links.

designated router (DR)

When a LAN has multiple multicast routers attached, one of the routers is elected as the router designated to forward the multicast traffic.

designated transit list (DTL)

A list of node and link identifiers that completely specify a path across a single PNNI peer group. Link identifiers are optional.

device alarm

An alarm that originated from a device (for example, a Nortel Multiservice Switch node).

DGCRA

See dynamic generic cell rate algorithm (DGCRA) (page 45).

dial backup network link (DBNL)

A type of dial-in DPN gateway providing connectivity when a dedicated connection breaks.

dial-in DPN gateway

A connection made by modem between a DPN module and a Nortel

Multiservice Switch node. The network link type is dial backup.

DiffServ

A Nortel Multiservice Switch IP differentiated service feature that provides IP traffic management.

DiffServ domain

Agroup of virtual routers that are using the same per-hop-behavior (page 101) definitions to apply differentiated services to IP traffic.

Nortel Multiservice Switch 7400/15000/20000

Terminology

NN10600-005 7.2S1 Standard

PCR7.2 and up March 2006

Copyright © 2006, Nortel

Nortel Confidential

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