CDMA Technology
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cdmaOne™ is the brand name that describes a complete digital wireless telecommunications solution based on the TIA/EIA IS-95 CDMA standard, including IS-95A and IS-95B revisions. It represents a second generation (2G) digital radio solution that uses the spectrally efficient Code Division Multiple Access (CDMA) scheme to send voice, data and signaling data (e.g., Caller ID) between mobile telephones and cell sites in a variety of spectrum and regulatory environments, including cellular, personal communication services (PCS), wireless local loop (WLL) and fixed wireless.

IS-95A: The first CDMA cellular standard

TIA/EIA IS-95 (Telecommunications Industry Association/Electronic Industries Association Interim Standard - 95) was published in July 1993. The IS-95A revision was published in May 1995 and is the basis for more than 115 commercial 2G CDMA systems around the world. IS-95A describes the 1.25 MHz CDMA channel structure, power control, call processing, intercellular hand-offs, and registration techniques for end-to-end wireless system operation. In addition to voice services, many IS-95A operators provide circuit-switched data connections at 14.4 kbps. IS-95A was first deployed in September 1995 by Hutchison in Hong Kong.

IS-95B: 2.5G

The IS-95B revision, also known as TIA/EIA-95, combines IS-95A, ANSI-J-STD-008 and TSB-74 into a single standards document. The ANSI-J-STD-008 specification, published in 1995, defines a compatibility standard for 1.8 to 2.0 GHz CDMA PCS systems. TSB-74 describes the interaction between IS-95A and CDMA PCS systems that conform to ANSI-J-STD-008. The operators that commercialized IS-95B systems offered 64 kbps packet-switched data services, in addition to voice services. Due to the data speeds that IS-95B is capable of reaching, it is categorized as a 2.5G technology. cdmaOne IS-95B was first deployed in September 1999, in South Korea, and has since been adopted by operators in Israel, Japan, Mongolia and Peru.