Alcatel-Lucent 1643 AMS Operation Manual page 347

Glossary
....................................................................................................................................................................................................................................
Numerics
5ESS
Number 5 Electronic Switching System
5TAD
Five Tributary Add-Drop subrack
9TAD
Nine Tributary Add-Drop subrack
12 digit Numerical Code (12NC)
Used to as the unique identifier of an item or product. The first ten digits identify an
item. The eleventh digit specifies the particular variant of the item. The twelfth digit
indicates the revision issue. Items for which the first eleven digits are the same are
functionally equal and may be exchanged.
....................................................................................................................................................................................................................................
A AAU
Alarm Adapter Unit. Radio Relay circuit pack that is used for the collection of external
alarms and remote control of external equipment.
AC
Alternating Current
Acknowledged Information Transfer Service (AITS)
The confirmed mode of operation of the LAPD protocol.
ACU
Alarm Collection Unit. Radio Relay circuit pack that collects of equipment alarms,
analogue measurements from internal monitoring points and calculation data.
ADM
Add-Drop Multiplexer
Administrative Unit (AU)
Carrier for TUs
....................................................................................................................................................................................................................................
365-312-803R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
GL-1