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List of terms
Nortel Multiservice Switch 7400/15000/20000
Terminology
NN10600-005 7.2S1 Standard
PCR7.2 and up March 2006
Copyright © 2006, Nortel Nortel Confidential
differentiated services code point
A 6-bit field in an IP packet header that is used for specifying differentiated
service parameters for the IP packet.
Digital Private Network Signaling System No 1 (DPNSS 1)
A common-channel signaling protocol intended for use between PBXs in
private networks through time slot 16 of a 2.048 Mbit/s digital transmission
system. Similarly, it can be used through time slot 23 of a 1.544 Mbit/s digital
transmission system.
DIN
Deutsche Industrialische Norm. A set of standards for electronic and industrial
products that originated in Germany.
Dijkstra’s algorithm
An algorithm that is sometimes used to calculate routes in an ATM network,
given a link and nodal state topology database.
direct memory access (DMA)
A method of transferring data to or from memory without having to use the
CPU, thus improving the overall speed of the system.
discard eligibility (DE)
A bit in the frame relay header. A frame is marked with the DE bit to indicate
that, in times of congestion, the frame is to be discarded before frames without
the DE bit set. This bit is set either by the user or the network.
discard priority (DP)
Discard priority refers to the importance of a frame or cell. The Nortel
Multiservice Switch system has 4 discard levels, where 0 is the most important
(last to be discarded) and 3 is the least important (first to be discarded).
Discard priority 0 is reserved for Multiservice Switch control traffic, leaving
three discard priorities for user traffic.
DLCI
See data link connection identifier (DLCI) (page 38).
DLSw
See data link switching (DLSw) (page 39).
DMA
See direct memory access (DMA) (page 42).
DME
See data manipulation engine (DME) (page 39).