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I

I/O       Input/Output
IAB       Internet Architecture[/Activities] Board
IANA      Internet Assigned Numbers Authority
IAS       Intelligent Antenna System
IBC       Integrated Broadband Communications
IBCN      Integrated Broadband Communication Network
IC        Integrated Circuit
ICA       International Communications Association
ICB       Intelligent Channel Bank
ICBO      International Conference of Building Officials
ICD       International Code Designator (ATM)
ICG       IntelCom Group
ICMP      Internet Control Message Protocol (IP suite)
ICMS      Interactive Commerce Management System
ICTSB     Information and Communication Technology Standards Board (CEN/CENELEC/ETSI)
IDCMA     Independent Data Communications Manufacturers Association
IDLC      Integrated Digital Loop Carrier
IDT       Integrated Digital Terminal
IEC       International Engineering Consortium
IEC       International Electrotechnical Commission
IEEE      Institute of Electrical and Electronics Engineers
IEN       Internet Experiment Notes (RFC)
IESG      Internet Engineering Steering Group 
IETF      Internet Engineering Task Force
IF        Intermediate Frequency
IFRB      International Frequency Registration Board
IGMP      Internet Group Management Protocol
I-IP      Infrastructure Intelligent Peripheral
IISP      Interim Inter Switch Protocol (Public NNI - ATM)
IITF      Information Infrastructure Task Force
ILMI      Interim Local Management Interface (UNI ATM)
IM        Intermodulation
IMA       Interactive Multimedia Association
IMEI      International Mobile Equipment Identity (GSM)
IMN       Intelligent Mobile Network
IMP       Interface Message Processor
IMSI      International Mobile Subscriber Identity (GSM)
I-Mux     Inverse Multiplexer
IN        Intelligent Network
INCM      Intelligent Network Conceptual Model
INMARSAT  International Maritime Satellite Organization
INS       Information Network System
INTELSAT  International Telecommunications Satellite Consortium
IOC       InterOffice Channel
IOD       Individual Outward Dialing
IOL       Inter-Orbit Link
IP        Intelligent Peripheral
IP        Internet Protocol
IPC       Input Port Controller
IP-C      Intelligent Peripheral Controller
IPG       Inter-Packet Gap (Ethernet)
IPO       Initial Public Offering
IPR       Intellectual Property Rights
IPR       Intellectual Property Rights
IRL       Inter-Repeater Link (Ethernet)
IRSG      Internet Research Steering Group
IRTF      Internet Research Task Force
IS        In Service
ISAPI	  Internet Server Application Programming Interface (Microsoft)
ISC       International Switching Center
ISC       Internet Software Consortium
ISCP      Integrated Services Control Point
ISDN      Integrated Services Digital Network
ISDN-PRM  ISDN Protocol Reference Model
ISI       Integrated Services over the Internet (aka IntServ)
ISI       InterSymbol Interface
ISL       Inter-Satellite Link
ISLAN     Integrated Services LAN
ISO       International Standards Organisation
ISP       Internet Service Provider
ISSS      Information Society Standardisation System
ISUP      ISDN User Part (SS7)
IT        Information Technology
ITC       Information Transfer Capability
ITSEC     Information Technology Security Evaluation and Certification
ITU       International Telecommunication Union
ITVN      Interactive TV News
IVHS      Intelligent Vehicle Highway System
IVN       Interactive Video Network
IVR       Interactive Voice Response
IWF       Inter-Working Function
IXC       IntereXchange Carrier

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