MT Magnetic Tape.
MTTY Maintenance Teletypewriter.
Multiplexing See Logical Multiplexing.
Multi-Service Access Device
An access device that provides connectivity between network
elements and Network Management systems.
Network A communication system to interconnect various devices.
Network Address Coded data that identifies the location of a network addressable
entity on a 1PSS.
Network Addressable Entity (NAE)
Any entity directly connected to the network that supports the
access interface protocol(s). Every network addressable entity is
identified by a network address. These network addressable
entities may include such items as user computers, intelligent
terminals, host (vendor) computers, Electronic Switching
System switching equipment processors, certain network
functions, and 1PSS provided virtual terminals.
NM Network Maintenance.
Node A point of a network where various links come together;
generally containing a switching element used to direct traffic.
OA&M Functions Operation, Administration, and Maintenance functions.
ODD Office Dependent Data.
OS Operation Services.
OS Operational Support.
OS Operating System.
Packet The unit of information passed between two packet level
protocol entities. It consists of a group of bits including data and
control elements and routing information in a specified format.
Also, a block of data handled by a network in a well defined
format including a header and having a maximum size of data
field. The unit of information passed between levels 2 and 3.
Packet Level Level 3 of the 1980 CCITT Recommendation X.25 interface
specification. It specifies the way control information and user
data are structured into packets and the elements of procedure
for use of control information.
Packet Switch The equipment in a node that is responsible for accepting and
routing packets and ensuring their correct arrival at an
adjacent node.
Packet Switched Data
Data transmitted over a Packet Switched network.
Packet Switched Network (PSN)
The interconnection of two or more packet switches to transfer
data.
GLOSSARY 235-200-150
May 2003
Page G-8 Issue 3.00
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