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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
path bumping
Path bumping is the forced rerouting of an existing path by a new higher
priority path of another logical connection. Bumping happens when there is
not enough bandwidth in the selected Nortel Multiservice Switch trunk to
establish a new path. The rerouting can in turn cause bumping of other paths.
A bumped path can be rerouted on another Multiservice Switch trunk if the
route selection criteria of the path are satisfied.
path endpoint
Defines each end of a path through a Nortel Multiservice Switch network.
path optimization
A process of finding and moving active connections to more optimal routes to
provide better utilization of network resources and traffic resources. In path
optimization, the incumbent connection segment is released after the
establishment of an alternate connection segment. Path optimization is also
known as soft rerouting and make-before-break rerouting.
path-oriented routing system (PORS)
Nortel Multiservice Switch routing system in which the path is determined
when the connection is set up and is fixed for the duration of the connection.
In the event of
Multiservice Switch trunk failure, the path can be rerouted. The
path then remains fixed in its new configuration. An advantage of path-
oriented techniques is that the delay variance between two endpoints can be
minimized by specifying the path in advance. This characteristic is important
for some traffic types, for example, a video signal carried over a transparent
data service (TDS).
path scope
The highest level reached in the private network-to-network interface (PNNI)
hierarchy when calculating the path.
path trace
A control plane mechanism that determines the physical nodes and physical
links traversed by new connections in the process of being established.
payload
A term used when discussing layered protocols for data communications. The
payload for one layer is the information delivered to it by the layer above it. The
header information added by that higher layer is considered to be part of the
payload.
payload type identifier (PTI)
A field in the ATM cell header that identifies the type of data carried by the cell.