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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
connection-oriented routing (CO)
A routing service in which the path used by the frames or cells is determined
when the connection is set up and remains fixed for the duration of the
connection (barring network problems). Each path is set up on the nodes of
that path and each packet needs a minimum of routing information.
connection preservation
The process of maintaining a connection over a sequence of potentially
disruptive events such that the connection does not need to be reestablished
when that sequence of events is complete.
Also known as call preservation.
constant bit rate (CBR)
An ATM Forum UNI 4.0 quality of service (QOS) class. This QOS class
defines a static bandwidth that is continuously available for the duration of a
connection. Corresponds to UNI 3.0/3.1 QOS class 1 and to Nortel
Multiservice Switch constant bit rate QOS class.
Networks use CBR for voice, video, and telemetry services that need carefully
metered transmission rates. In this sense, CBR emulates individual private
line service. CBR avoids disagreeable “glitches” in service quality that result
from data rate variance and data losses.
continuation of message cells (COM)
All cells in a stream between the beginning of message cell and the end of
message cell, all of which belong to a series of cells that result from
segmentation of higher-layer packets or frames.
control plane (C-plane)
Defines all aspects of the management and control of frame relay. The local
management interface (LMI) is the interface to the C-plane. It uses procedures
defined in
• Frame Relay User-to-Network Interface With Extensions, document
number 001-208966 (available through Nortel Networks)
• ANSI T1.617 Annex D
• ITU-T Q.933 Annex A
For more information, see NN10600-900 Nortel Multiservice Switch 7400/
15000/20000 Frame Relay Technology Fundamentals.