Glossary
GL-10 Issue 3 June 2000
IEC
International Electrotechnology Commission
IMF
Infant Mortality Factor
INC
Incoming Status
INCM
A parallel telemetry point used to indicate incoming low-speed failures.
I/O
Input/Output
IP
Internetwork Protocol
IR
Intermediate Reach — A term used to describe distances of from 15 to 40 km between optical
transmitter and receiver without regeneration. See LR (Long Reach).
IS
In Service — One possible state of a DS1, DS3, or EC-1 port. Other possible states are "auto"
(automatic) and "nmon" (not monitored).
ISCI
Intershelf Control Interface
ISI
Intershelf Interface
ISDN
Integrated Services Digital Network
IS-3
An intraoffice short reach proprietary interface provided by the 21D/21D-U and 22D-U optical line
interface units.
ISO
International Standards Organization — See OSI.
ITU-TSS
International Telecommunication Union — Telecommunication Standardization Sector
IVHS
Intelligent Vehicle Highway System
J
Jitter
Timing jitter is defined as short-term variations of the significant instants of a digital signal from their
ideal positions in time.
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