ATL USER GUIDE
OM100 Optical Multiplexer
81
AIS Alarm Indication Signal
BERT Bit Error Rate Test/Tester
CCITT International Telegraph and Telephone Consultative Committee
DCE Data Circuit-terminating Equipment
DTE Data Terminating Equipment
E1 The European standard 2.048Mbps digital carrier system
EBER Effective Bit Error Ratio
ETSI European Telecommunications Standards Institute
HDSL High bit rate Digital Subscriber Line
HHT Hand Held Terminal
ISDN Integrated Services Digital Network
ITU International Telecommunications Union
LED Light Emitting Diode
LOS Loss Of Signal
LT Line Terminator
LTU Line Terminating Unit
NT1 Network Terminator for PRI/BRI
PPP Point to Point Protocol
PRA Primary Rate Access
PRBS Pseudo Random Bit Sequence
PRI Primary Rate ISDN
Sa6 bits Message passing system used in Primary Rate Access
UI Unit Interval
UPS Uninterruptible Power Supply
V28 CCITT specification. Electrical characteristics for unbalanced double-current
interchange circuits
10 GLOSSARY OF TERMS
80 ATL USER GUIDE
OM100 Optical Multiplexer
10
