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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
logical processor type (LPT)
Defines the characteristics of an LP. The LPT specifies which software needs
to be loaded and provides some processor engineering parameters.
long loop
The ABR VS/VD scenario where FRM cells transit the node to the egress FP
before the node turns them around to become BRM cells.
LOS
See loss of signal (LOS) (page 77).
loss of delay synchronization (LODS)
When the delay on a physical link changes such that it exceeds the maximum
differential delay specified for the IMA link group, the link is considered to have
lost its delay synchronization. That is, the link has experienced a loss of delay
synchronization (LODS), and is deactivated from the link group.
loss of frame (LOF)
This failure condition is declared after severely errored frame (SEF) defects
have been detected for at least two seconds for a DS1, DS3, E1, or E3.
loss of IMA frame (LIF)
A failure condition in which IMA framing is lost on a link that is part of an IMA
link group.
loss of signal (LOS)
For DS1, DS3, E1, and E3, this event is detected at a line interface when
175+/-75 contiguous pulse positions with no pulses of either positive or
negative polarity are detected. An LOS failure condition is declared after LOS
defects have been observed for at least 2 s.
Low-delay code excited linear prediction (LD-CELP)
A 16 kbit/s compression algorithm used to encode voice data, based on
ITU-T
recommendation G.728.
low-entry networking (LEN) node
In Systems Network Architecture (SNA), a physical unit type 2.1 with a control
processor does not communicate with other nodes. LEN nodes support
logical unit protocols.
lowest level node
A leaf in the PNNI routing hierarchy. A lowest level node is an abstraction that
represents a single instance of the PNNI routing protocol. Lowest level nodes
are created in a switching system through provisioning and are not created
dynamically.