Issue 2.0 April 2000
GL-1
365-353-255
DACS II Operation and Maintenance Manual
Glossary
A
AIS
Alarm Indication Signal (also known as all 1s signal).
Alarm Indication Signal (AIS)
A signal transmitted downstream to indicate that network transmission line failures were detected
upstream.
All Ones Signal
Another name for DS1 Alarm Indication Signal (AIS). It is defined to contain all ones in the
terminal-to-terminal mode.
B
BER
Bit Error Rate.
Byte
Usually refers to a group of eight consecutive binary digits, but sometimes used for bit groups of other
sizes.
C
CEF
Capacity Expansion Frame.
CEPT
Conference of European Postal Telecommunications (standard E1signal: 2.048 Mb/s).
CGA
Carrier Group Alarm.
Cross-Connect
A piece of hardware used to interconnect line-terminating equipment, multiplexers, and other
equipment.
Cross-Connection
An interconnection between two specified NPC channels.
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