Glossary: Mostlyabreviations and acronyms:
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IAC: Internet Access Coalition; formed in responseto RBOCs blaming voice phone network congestion onInternet usage. Support this group or watch your ISPrates jump immediately. ( FCC issupposed to make a 'final' decision on whether ISP'scan maintain their 'enhanced service provider' status, making them exemptfrom current access charges, such as those paid by long-distance carriersto 'local exchange carriers' (LECs)-- which includes RBOCs.

IAHC: Internet Ad Hoc Committee, (

IANA: Internet Assigned Numbers Authority

IAT: International Atomic Time

IB: In Band

IBM: International Business Machines,

IC: Integrated Circuit

IC: Inter-exchange Carrier; a telephone operationconnecting two or more telephone exchange switches.

ICMP: Internet Control Message Protocol

ICRC: Introduction to Cisco Router Configuration

IDE: Interactive Delopment Environment

IDE: Integrated Drive Electronics

I-DEAS:A 3D Solid Modeling suite of applicationsused for Design, Analysis and Manufacturing. (SDRC)

IDL: Interface Definition Language

IDRP: Inter-Domain Routing Protocol

IEC: Inter-Exchange Carrier (see also IC,IXC)

IEC: International Electrotechnical Commission,(

IEEE: Instituteof Electronic and Electrical Engineers

IEEE 1394: A new, very fast externalbus standard that supports data transfer rates of up to 400 Mbps (400 millionbits per second). Products supporting the 1394 standard go under differentnames, depending on the company. Apple, which originally developed thetechnology, uses the trademarked name FireWire.  Other companies useother names, such as I-link and Lynx, to describe their 1394 products.

A single 1394 port can be used to connect up 63 external devices. Inaddition to its high speed, 1394 also supports isochronous data -- deliveringdata at a guaranteed rate. This makes it ideal for devices that need totransfer high levels of data in real-time, such as video devices.

Although extremely fast and flexible, 1394 is also expensive. Like USB,1394  supports both Plug-and-Play and hot plugging, and also providespower to peripheral devices. The main difference between 1394 and USB isthat 1394 supports faster data transfer rates and is more expensive. Forthis reason, it is expected to be used mostly for devices that requirelarge throughputs, such as video cameras, whereas USB will be used to connectmost other peripheral devices.
IESG: Internet Engineering Steering Group

IETF: Internet Engineering Task Force, (

IFF: Interchange File Format, (Amiga)

IGES: Initial Graphics Exchange System

IGMP: Inernal Gateway Message Protocol

IGMP: Internet Group Management Protocol;Network multimedia applications for IP use IGMP to joinmulticast groups. PIM and DVMRPuse IGMP to determine the location of hosts that have joined a multicastgroup.

IGP: Interior Gateway Protocol; An Internetprotocol which distributes routing information to the routers within anautonomous system.The term "gateway" is historical, "router" is currently the preferred term.

IGRP: Internet Gateway Routing Protocol, (Cisco)

IIOP: Internet Inter-ORBProtocol

IISP: Interim Inter-Switch Signaling Protocol,(ATM)

ILEC: Incumbent Local Exchange Carrier, (seealso LEC)

ILP: Integrated Layer Processing

IMAP: Internet Message Access Protocol

IMP: Interface Message Processor

I-NLSP: Internet Network Layer SecurityProtocol

INN: InterNet News; a 'netnews' server application.

INTA: International Trademark Association,(

IP: Internet Protocol; 32-bit address assignedto hosts using TCP/IP. An IP address belongs to oneof five classes (A, B, C, D, or E) and is written as 4 octets separatedby periods (dotted decimal format). Each address consists of a networknumber, an optional subnetwork number, and a host number. The network andsubnetwork numbers together are used for routing, while the host numberis used to address an individual host within the network or subnetwork.A subnet mask is used to extract network and subnetwork information fromthe IP address. Classless interdomain routing (CIDR) provides a new wayof representing IP addresses and subnet masks. Also called an Internetaddress.

IPng: Internet Protocol Next Generation;see IPv6

IPv6: Internet Protocol version 6; A replacementfor the current version of IP (Version 4). IPv6 includessupport for flow ID in the packet header, which can be used to identifyflows. Formerly known as IPng(next generation). (RFC 1883,and IPv6 Addressing Architecture RFC 1884)

IPC: Inter-Process Communication

IPO: Initial Public Offering

IPX: Internetwork Packet eXchange, (Novell)

IRDS: Information Resource Dictionary System,(ISO)

IRIX: Unix version provided by Silicon Graphics,Inc. (SGI)

IRR: Internet Routing Registry; the compositeof serveral Internet routing databases.

IRTF: Internet Research Task Force

IS: Information Systems

IS: International Standard, (ISO/IEC)

ISDN: Integrated Services Digital Network;A digital network with circuit and packet switching for voice and datacommunications at data rates up to 1.544 or 2.048 Mbps. Basic Rate Access(BRA) provides two B channelsat 64 kbps each and a D channel at 16 kbps. PrimaryRate Access (PRI) provides twenty three (U.S.) or thirty(Europe) B channels and a single D channel at64 kbps.

IS-IS: Intermediate System-Intermediate System;The OSI Interior Gateway Protocol.

ISO: InternationalStandards Organization

ISO/IEC: InternationalStandards Organization/ International Electrotechnical Commission,(IEC)

ISO/OSI: InternationalStandards Organization/ Open Systems Interconnect, (OSI)

ISP: Internet Service Provider

ISSC: Integrated Systems Solutions; formerlyIBM's Federal Systems Division, then 'Integrated Systems Division'. (IBM)

ISSCC: International Solid State CircuitsConference

IT: Information Technology

ITC: Independent Television Commission, (

ITFS: Instructional Television Fixed Service.Educational service includes Internet Access.  ITFS uses 6 MHz channels,shared with MMDS, between 2500-2690 MHz

ITS: International Teleproduction Society,(

ITU: InternationalTelecommunication Union

ITU-R: InternationalTelecommunication Union - Radiocommunication Section

ITU-T: InternationalTelecommunication Union - Standardization Section

ITV: Interactive TelevisionA

IXC: Inter eXchange Carriers

Last Update:12/13/03
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