Alcatel-Lucent 1665 Installation Manual page 416

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AIS - Alarm Indication Signal
A code transmitted downstream in a digital network that shows that an upstream failure has been
detected and alarmed.
AMI - Alternate Mark Inversion
A line code that employs a ternary signal to convey binary digits, in which successive binary ones
are represented by signal elements that are normally of alternating, positive and negative polarity
but equal in amplitude, and in which binary zeros are represented by signal elements that have zero
amplitude.
ASCII - American Standard Code for Information Interchange
A standard 8-bit code used for exchanging information among data processing systems and
associated equipment.
Auto
One possible state of a service interface port. In this state, the port will automatically be put "in
service" if a good incoming signal is detected on the port.
Automatic Protection Switch
A feature that allows another synchronization source to be automatically selected and the
synchronization source provisioning to be automatically reconfigured in the event of a
synchronization source failure or network synchronization change, for example, a fiber cut.
Available Time
In performance monitoring, the 1-second intervals.
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B
B3ZS - Bipolar 3-Zero Substitution
A line coding method that replaces a string of three zeros with a sequence of symbols having some
special characteristic.
B8ZS - Bipolar 8-Zero Substitution
A line coding method that replaces a string of eight zeros with a sequence of symbols having some
special characteristic.
Backbone Ring
A host ring.
BER - Bit Error Ratio
The ratio of bits received in error to the total bits sent.
BIP - Bit Interleaved Parity
A method of error monitoring over a specified number of bits, that is BIP-3 or BIP-8.
BITS - Building Integrated Timing Supply
A single clock that provides all the DS1 and DS0 synchronization references required by clocks in
a building.
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GL - 1 6
Terms and definitions
365-372-304R7.1
Issue 2 March 2008