IS

IS-95

admin — Tue, 13 Mar 2007 11:22:02 +0000

IS-95

The standard for CDMA. (Cingular)

Interim Standard 95 (IS-95), is the first CDMA-based digital cellular standard pioneered by Qualcomm. The brand name for IS-95 is cdmaOne. IS-95 is also known as TIA-EIA-95.

It is a 2G mobile telecommunications standard that uses CDMA, a multiple access scheme for digital radio, to send voice, data and signaling data (such as a dialed telephone number) between mobile telephones and cell sites.

CDMA or "code division multiple access" is a digital radio system that transmits streams of bits (PN Sequences) . CDMA permits several radios to share the same frequencies. Unlike TDMA "time division multiple access", a competing system used in GSM, all radios can be active all the time, because network capacity does not directly limit the number of active radios. Since larger numbers of phones can be served by smaller numbers of cell-sites, CDMA-based standards have a significant economic advantage over TDMA-based standards, or the oldest cellular standards that used frequency-division multiplexing. » read more »

IS-661

admin — Tue, 13 Mar 2007 11:21:26 +0000

IS-661

North American standard for 1.9 GHz wireless spread spectrum radio-frequency access technology based on a composite of CDMA and TDMA technologies to reduce infrastructure costs and allow higher data speeds than mainstream GSM or TDMA platforms. (Cingular)

IS-54

admin — Tue, 13 Mar 2007 11:21:09 +0000

IS-54

The first generation of the digital standard TDMA technology. (Cingular)

IS-41

admin — Tue, 13 Mar 2007 11:20:50 +0000

IS-41

The network standard that allows all switches to exchange information about subscribers. (Cingular)

IS-136

admin — Tue, 13 Mar 2007 11:20:31 +0000

IS-136

The latest generation of the digital standard TDMA technology. (Cingular)

IS-54 and IS-136 are second-generation (2G) mobile phone systems, known as Digital AMPS (D-AMPS). It is used throughout the Americas, particularly in the United States and Canada. D-AMPS is considered end-of-life, and existing networks are in the process of being replaced by GSM/GPRS and CDMA2000 technologies. Although most often referred to as TDMA, this is an incorrect reference to the protocols. IS-54 and IS-136 do, however, use Time Division Multiple Access as an air interface.

D-AMPS uses existing AMPS channels and allows for smooth transition between digital and analog systems in the same area. Capacity was increased over the preceding analog design by dividing each 30 kHz channel pair into three time slots and digitally compressing the voice data, yielding three times the call capacity in a single cell. A digital system also made calls more secure because analog scanners could not access digital signals. Calls were encrypted, although the algorithm used (CMEA) was later found to be weak. [1] » read more »

IS (interim standard)

admin — Tue, 13 Mar 2007 11:20:08 +0000

IS (interim standard)

A designation of the Telecommunications Industry Association --usually followed by a number--that refers to an accepted industry protocol; e.g., IS-95, IS-136, IS-54. (Cingular)