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CTS 710 SONET Test Set User Manual
Glossary–1
Glossary
AIS
An acronym for Alarm Indication Signal. An AIS is used to alert
downstream equipment that an upstream failure has been
detected.
APS
An acronym for Automatic Protection Switching.
ASCII
An acronym for American Standard Code for Information
Interchange.
BER
An acronym for Bit Error Ratio (or Rate). The principal measure
of quality of a digital transmission system. BER is defined as:
BER +
Number of Errors
Total Number of Bits
BER is usually expressed as a negative exponent. For example,
a BER of 10
–7
means that 1 bit out of 10
7
bits is in error.
BIP
An acronym for Bit Interleaved Parity. A method used to
monitor errors in the transmitted signal.
Bit Error
An incorrect bit. Also known as a coding violation.
BITS
An acronym for Building Integrated Timing Supply.
COFA
An acronym for Change of Frame Alignment.
CTS 710 SONET Test Set User Manual
Glossary–1
Glossary
AIS
An acronym for Alarm Indication Signal. An AIS is used to alert
downstream equipment that an upstream failure has been
detected.
APS
An acronym for Automatic Protection Switching.
ASCII
An acronym for American Standard Code for Information
Interchange.
BER
An acronym for Bit Error Ratio (or Rate). The principal measure
of quality of a digital transmission system. BER is defined as:
BER +
Number of Errors
Total Number of Bits
BER is usually expressed as a negative exponent. For example,
a BER of 10
–7
means that 1 bit out of 10
7
bits is in error.
BIP
An acronym for Bit Interleaved Parity. A method used to
monitor errors in the transmitted signal.
Bit Error
An incorrect bit. Also known as a coding violation.
BITS
An acronym for Building Integrated Timing Supply.
COFA
An acronym for Change of Frame Alignment.