cdmaOne was the first cellular standard to implement the CDMA multiple access scheme, also known as IS-95. Individual channels can be distinguished from one another by means of unique orthogonal codes. Within this standard, all services – including speech and data – are circuit-switched with a maximum data rate of either 9.6 kbit/s or 14.4 kbit/s on each channel. With the IS-95-B technology extension, many operators also offer 64 kbit/s packet-switched data, in addition to voice services. A bandwidth of 1.25 MHz results in up to 61 channels under optimal channel conditions. cdmaOne is included as a subset in all cdma2000® standards up to the latest 1xEV-DO Rev. B standard.
