| I |
In-Phase |
For PSK modulation, the reference phase channel. See also Q. |
| IF |
Intermediate Frequency |
The operating frequency in superheterodyne receivers where amplification, filtering and level control prior to demodulation is accomplished. |
| IMAP4 |
Internet Messaging Access Protocol |
A remote mailbox access protocol. It enables efficient operation such as downloading only essential data by first acquisitioning the e-mail header prior to actual e-mail download. This feature makes the protocol well suited to remote environments. |
| IMEI |
International Mobile Station Equipment Identity |
|
| i-mode |
Internet Mode |
A wireless service launched in Japan in spring 1999 by NTT DoCoMo. The service is accessed by a wireless packet network (PDC-P) and the contents are described in a subset of the HTML language. |
| IMSI |
International Mobile Station Identity |
|
| IMT-2000 |
International Mobile Telecommunication 2000 |
A term used by the International Telecommunication Union, a United Nations agency, to describe the third generation mobile telephony due to be ready in 2000. Can also be applied to mobile telephone standards that meet a number of requirements in terms of transmission speed and other factors. |
| IMTS |
Improved Mobile Telephone Service |
|
| IN |
Intelligent Network |
Often referred to as the Advanced Intelligent Network, this is a network of equipment, software and protocols used to implement features on the network and support switching and control functions. |
| Internet capability |
|
Functionality in a wireless network enabling access to the Internet for web page viewing and e-mail purposes. |
| IP |
Internet Protocol |
A set of instructions defining how information is handled as it travels between systems across the Internet. |
| IPR |
Intellectual Property Rights |
Also known as patents, these are the rights of an inventor or assignee to develop and commercialize an invention and license it, usually for a fee, to other manufacturers. |
| IPv6 |
Internet Protocol version 6. |
The latest IP version. Address exhaustion is prevented by means of a long address field, thereby enabling further Internet expansion. In addition, security and mobility are built into the protocol. Currently utilized IP addresses are almost all IPv4, and with the present rate of Internet growth this type of address will be exhausted by 2010. IPv6 on the other hand enables 10 to the 29th power more available addresses than the previous IPv4. |
| IS-136 |
EIA Interim Standard 136 - NADC with Digital Control Channels |
The North American digital mobile telephony standard based on TDMA technology. It is the version of the TDMA specification resulting in a fully digital 2nd generation system and is backward compatible with analog AMPS. See also TDMA and D-AMPS. |
| IS-2000 |
EIA Interim Standard 2000 (see cdma2000) |
A standard for current CDMA systems providing a migration path to 3G services. |
| IS-41 |
Inter-network connection protocol for connecting systems based on both analog and digital US standards. |
Inter-network connection protocol for connecting systems based on both analog and digital US standards. |
| IS-54 |
EIA Interim Standard for U.S. Digital Cellular |
Original TDMA digital standard. Implemented in 1992. This standard was the first to permit the use digital channels in AMPS systems. It used digital traffic channels but retained the use of analog control channels. This standard was replaced by the IS-136 digital standard in 1996. |
| IS-95a |
EIA Interim Standard 95 (see cdmaOne) |
The original digital mobile telephony standard based on CDMA technology. See also CDMA. |
| 1S-95b |
|
Upgraded version of IS-95a that increases the maximum data rate to 115.2
kb/s. |
| ISDN |
Integrated Services Digital Network. |
A technology offering switched and fixed high speed transmission of voice, data and video through the existing telephone infrastructure. The service is based on 1 or more 64 kbps digital channels and does not use traditional modems. |
| ISI |
Inter-Symbol Interference |
An interference effect where energy from prior symbols in a bit stream is present in later symbols. ISI is normally caused by filtering of the data streams. |
| ITU |
International Telecommunications Union |
A United Nations agency that deals with telecommunications issues. |
| IWF |
Interworking Function |
A technique for interfacing data between a wireless system and the telephone network. It usually involves the use of modems or data terminal adapters to convert the data transmitted over the air interface and mobile network to a format that can be recognized and carried by the public telecommunications network. |
