TCP
See “Transmission Control Protocol” (p. GL-30) for definition.
TCP/IP
A suite of several networking protocols developed for the Internet that provides communication
across interconnected networks, between computers with diverse hardware architectures and
various operating systems. Some examples are FTP, SMTP, and SNMP.
TDM
See “time-division multiplexing” (p. GL-29) for definition.
Telecommunications Management Network (TMN)
A network that interfaces with a telecommunications network at several points to receive
information from, and to control the operation of, the telecommunications network.
thermal noise
Noise resulting from thermally induced random fluctuation in the receiver's load resistance
current.
threshold crossing alert (TCA)
A condition set when a counter exceeds a user-selected high or low threshold. A TCA does not
generate an alarm but is available on demand through the CIT.
TID
See “target identifier” (p. GL-28) for definition.
time-division multiplexing (TDM)
A multiplexing technique whereby two or more channels are derived from a transmission medium
by dividing access to the medium into sequential intervals. Each channel has access to the entire
bandwidth of the medium during its interval. This implies that one transmitter uses one channel to
send several bit streams of information.
TL1 (Transaction language 1)
An OS/NE machine-to-machine language. TL1 messages are expressed as ASCII strings. TL1
messages and syntax are defined by Telecordia.
TMN
See “Telecommunications Management Network” (p. GL-29) for definition.
TOADM
See “tunable optical add/drop multiplexer” (p. GL-30) for definition.
topology
The pattern of interconnections between nodes in a network, such as a ring or hub. A network
topology database contains information regarding each link in the network.
Glossary
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1830 PSS-36/PSS–32/PSS-16/PSS-4
8DG60888CAAA Release 3.6.0 and 3.6.1
Issue 1 June 2011
GL-29
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