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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
subcomponent
A component hierarchically named within another (for example, lp/0 v35/0 is
a subcomponent of lp/0).
subnet mask
A method for identifying the subnet field from the host field of an address. This
divides a network into smaller administrative units called subnetworks or
subnets.
successive SET alarm
A SET alarm received while there is an outstanding SET alarm against the
same NTP index and component name.
summary address
In PNNI networking, an address prefix that tells a node how to summarize
reachability information. See
address summarization (page 7).
sustainable cell rate (SCR)
One of a set of traffic characterization values used to define traffic
characteristics through the traffic descriptor types.
SCR defines the upper bound of the cell rate that can be sustained for a
connection over an indefinite time period. It is used by the network operator to
configure the connection to ensure the QOS defined in the traffic contract.
The five values used in the traffic descriptor parameters are peak cell rate
(PCR), sustainable cell rate (SCR), maximum burst size (MBS), cell delay
variation tolerance (CDVT), and requested shaping rate (RSR).
SVC
1 See switched virtual channel (SVC), ATM networking (page 130).
2 See switched virtual circuit (SVC) (page 130).
switched multimegabit data service (SMDS)
A set of standards developed by Telcordia for communication over telephone
lines.
switched permanent virtual circuit (SPVC)
A type of virtual circuit (VC) that allows configured SPVC endpoints in two
different frame relay or ATM networks to establish a switched connection
across network-to-network interfaces (NNIs). It is a logical connection for
which endpoints are configured by the network operator but for which the
route is selected automatically.