Alcatel-Lucent 1643 AMS User's Operation Manual page 713

Glossary
TMN
Telecommunications Management Network
TPU
Tributary Port Unit
TPU-PCT
Tributary Port Unit - Peripheral Control and Timing link
TPU155
Tributary port Unit 155 Mbit/s
TPU2
Tributary port Unit 2 Mbit/s
TPU34/45
Tributary port Unit 34/45 Mbit/s
Transmit-direction
The direction outwards from the cross-connect.
Trellis Code Modulation
A combined coding and modulation scheme for improving the reliability of a digital
transmission system without increasing the transmitted power or the required bandwidth.
TRF
TRansFer unit
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.
Tributary Overhead Controller (TOC)
SLM circuit pack that allows access to the overhead bytes of the incoming tributary
signal.
Tributary Overhead Controller (TOHCTL)
OLS circuit pack that allows access to the overhead bytes of the Supervisory channel.
Tributary Unit (TU)
An information structure that provides adaptation between the lower order path layer and
the higher path layer. Consists of a VC-n plus a tributary unit pointer TU PTR.
Tributary Unit Pointer (TU PTR)
Indicates the phase alignment of the VC with respect to the TU in which it resides. The
pointer position is fixed with respect to the TU frame.
TSA
Time Slot Assignment
TSI
Time Slot Interchange
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365-312-807R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
GL-33