Span
An uninterrupted bidirectional fiber section between two network elements.
Station Clock Input
An external clock may be connected to a Station Clock Input.
STM
Synchronous Transport Module (SDH)
STM-N (Synchronous Transport Module, Level N)
A building block information structure that supports SDH section layer connections,
where N represents a multiple of 155.52 Mbit/s. Normally N = 1, 4, 16, 64 or 256.
STS
Synchronous Transport Signal (SONET)
Synchronous Network
The synchronization of transmission systems with synchronous payloads to a master
(network) clock that can be traced to a reference clock.
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T
TBD
To Be Determined
TI
Timing Interface
TID (Target Identifier)
A provisionable parameter that is used to identify a particular Network Element within a
network. It is a character string of up 20 characters where the characters are letters,
digits, or hyphens (-).
TL1 (Transaction Language One)
A subset of the ITU human-machine language.
TM (Terminal Multiplexer)
An Add/Drop Multiplexer with only one stream interface.
Tributary
A signal of a specific rate (2 Mbit/s, 34 Mbit/s, 140 Mbit/s, VC12, VC3, VC4, STM-1 or
STM-4) that may be added to or dropped from a line signal.
Two-Way Point-to-Point Cross-Connection
A two-legged interconnection, that supports two-way transmission, between two and only
two tributaries.
Tx
Transmit/OUT
Glossary
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365-374-187
Issue 1, December 2005
Lucent Technologies - Proprietary
See notice on first page
GL-11