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12 Appendix: Abbreviation
Abbreviations
ADM
Add-Drop Multiplexer
AIS
Alarm Indication Signal
APS
Automatic Protection Switching
AU
Administrative Unit
AU-n
Administration Unit，level n
AUG
Administration Unit Group
AU-PTR
Administration Unit Pointer
BBE
Background Block Error
BBER
Background Block Error Ratio
BER
Bit Error Ratio
CMI
Coded Mark Inversion
C-n
Container- n
CORBA
Common Object Request Broker Architecture
CV
Code Violation
DCC
Data Communications Channel
DCE
Data Circuit-terminating Equipment
DCF
Data Communications Function
DCN
Data Communications Network
DDN
Digital Data Network
DTE
Data Terminal Equipment
DXC
Digital Cross Connect
ECC
Embedded Control Channel
EM
Element Management
EML
Element Management Layer
EMS
Element Management System
EOS
Ethernet Over SDH
ES
Error Second
ESR
Error Second Ratio
ETSI
European Telecommunication Standards Institute
FEBBE
Far End Background Block Error
FEES
Far End Error Second
FESES
Far End Severely Error Second
GUI
Graphical User Interface
HDLC
High Digital Link Control
HPC
Higher order Path Connection
IP
Internet Protocol
International
ITU-T
Union-Telecommunication Standardization Sector
L2
Layer 2
LAN
Local Area Network
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