Table of Contents
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LOS
MCT
MTCE
NIWF
NMTI
NVM
OAM
PDU
PPP
PSD
PVC
QoS
Speed Touch 591s Technical Practices
February 2001
90-8785-01
a) loss of signal
LOS is an indication that no valid signal can be detected at the transmission
interface.
b) loss of synchronization
mild congestion threshold
maintenance
MTCE is an LED on the Speed Touch 591s, indicating that it is in a
maintenance state when lit (usually when a loopback is in progress).
network interworking function
An NIWF is an interworking function used to transport frame relay packets
across an intermediate network to another frame relay network.
node management terminal interface
The local user interface for an Alcatel network product.
nonvolatile memory
NVM is memory that maintains its contents during power loss conditions.
operations, administration, and maintenance
OAM includes network maintenance features such as connectivity
verification, alarm surveillance, continuity checking, and performance
monitoring.
protocol data unit
The PDU is the unit of data in the OSI Reference Model. It contains both
protocol-control information and user data from the layer above and allows
the two processes to coordinate interactions.
point-to-point protocol
PPP is a protocol that allows a computer to use TCP/IP with a standard
telephone line and a high-speed modem to establish a link between two (and
only two) terminal installations.
power spectral density
permanent virtual circuit
A PVC is a frame relay end-to-end logical connection that extends between
two user or network interfaces. A single PVC may pass through several
frame relay switching modes.
quality of service
For ATM, the quality of service of a connection is defined by its traffic
characteristics such as cell loss probability, cell delay variation, and cell
delay.
Glossary
GL-5
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