Appendix G – Glossary
Acterna ANT-5 Page 165
15. Appendix G – Glossary & Acronyms
A1 Frame synchronisation byte; 1111 0110 (RSOH)
A2 Frame synchronisation byte; 0010 1000 (RSOH)
AAL-n ATM Adaptation Layer, Type n = 1, 2, 3/4 or 5
ADM Add/Drop Multiplexer
AIS Alarm Indication Signal
ANSI American National Standards Institute
APS Automatic Protection Switching (channels K1, K2)
ATM Asynchronous Transfer Mode
AUG Administrative Unit Group
AU-n Administrative Unit; Level n = 3, 4
B1 BIP-8 parity word in regenerator section (RSOH)
B2 BIP-N x 24 parity word in multiplex section (MSOH)
B3 BIP-8 parity word in VC-3, 4 path (POH)
BBE, BBER Background Block Error, Background Block Error Ratio
BER, BLER Bit Error Ratio, Block Error Ratio
BIP-2 BIP-2 parity word in VC-1, 2 path (POH)
BIP-N Bit Interleaved Parity; N bits
BIS[P]O Bringing into service [performance] objectives
C2 Signal label (VC-3, 4 POH)
CAS Channel Associated Signalling
CBR Constant Bit Rate
CCM Cross-Connect Multiplexing
CDV Cell Delay Variation
CDVT Cell Delay Variation Tolerance
CER Cell Error Rate
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