Holdover
An operating condition of a network element in which its local oscillator is not locked to any
synchronization reference but is using storage techniques to maintain its accuracy with respect
to the last known frequency comparison with a synchronization reference.
Hz
Hertz
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I
I/O
Input/Output
IAO LAN
Intraoffice Local Area Network
ID
Identifier
IEC
International Electrotechnical Commission
IEEE
Institute of Electrical and Electronics Engineers
In-Service (IS)
A memory administrative state for ports. IS refers to a port that is fully monitored and alarmed.
INC
Incoming Status
Intermediate Reach (IR)
A term used to describe distances of 15 to 40 km between optical transmitter and receiver
without regeneration. See long reach.
IP
Internet Protocol
IR
Intermediate Reach
IS
In Service
ISO
International Standards Organization
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G L O S S A R Y
G L - 1 2
Lucent Technologies
365-372-333 R2.1
Issue 4, June 2005