What isNarrowband CDMA

The Interim Standard first-generation CDMA mobile technology, also known as IS-95A/N-CDMA/cdmaOne, was deployed in 1995 and operates in the 800 MHz band and 1.9 GHz PCS spectrum. In 1999, a 64 Kbps packet capability was added to IS-95B to allow data to be sent to a CDMA telephone. However, CDMA2000 has replaced IS-95B.

FAW about the Interim Standard First-Generation CDMA Mobile Technology

The Interim Standard First-Generation CDMA mobile technology, also known as IS-95, has made significant contributions in the development of mobile communication technology. IS-95 is a set of standards that operates in the 800 MHz band and the 1.9 GHz PCS spectrum. It was first deployed in 1995 and later replaced by the CDMA2000.

One of the significant advantages of IS-95 is its ability to provide seamless communication. The technology allows multiple users to share the same frequency through unique codes that distinguish each user. This feature significantly increased capacity and provides a more reliable and robust communication system, allowing users to communicate with each other without experiencing time-consuming disruptions, thereby improving overall communication efficiency.

IS-95 is known for its “cdmaOne” technology and is also referred to as “IS-95A” and “Narrowband CDMA” (N-CDMA). It was a significant milestone in the evolution of the Code Division Multiple Access (CDMA) mobile communication system. IS-95A was introduced as a first-generation technology that offered voice-oriented services.

WHAT is the Technology behind IS-95?

IS-95 uses a spread-spectrum technology called “Direct Sequence Spread Spectrum” (DSSS). In Direct Sequence Spread Spectrum, data is transmitted in the form of narrowband signals through a broader frequency spectrum. The transmitted signal is modulated with what is known as a “spreading code.” The spreading code’s bandwidth is greater than the narrowband signal, and the combination is sent out as a wideband signal, enabling multiple users to share the same frequency without interfering with each other’s signals.

IS-95’s implementation of DSSS has allowed it to be one of the most powerful modulation schemes among its counterparts. It allows multiple calls to be placed over a single channel, providing a more efficient use of available bandwidth. The CDMA network standardization study group known as the CDMA Development Group refers to IS-95 as the essential foundation of 3GPP2’s CDMA2000 family of cellular communication standards.


IS-95 has made significant contributions to the development of mobile communication technology by introducing advanced spectrum technology that allowed for a more efficient use of the available bandwidth. Its innovative technology provided a more reliable and robust communication system, drastically improving overall communication efficiency, setting a standard for future mobile communication development. While replaced by the CDMA2000, it has left an everlasting benchmark on the mobile communication industry and helped revolutionize the way we communicate today.

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