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 ITU’s 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
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U
UL
UL marking indicates that the products conform to relevant American Directives.
UPL
User Panel
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365-374-074
Issue a, April 2002
Lucent Technologies
G L O S S A R Y
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