Single-Carrier Radio Transmission Technology

Single-Carrier Radio Transmission Technology (1xRTT) is an operational mode for CDMA2000 wireless communications that specifies a single (1x) 1.25MHz channel for data transfer.

1xRTT was the first version of CDMA2000, which is the International Telecommunication Union's (ITU) CDMA (Code-Division Multiple Access) implementation of the IMT-2000 standard. The theoretical network voice capacity of basic 1xRTT systems is approximately 144 kilobits per second (Kb/s) although in practice the highest attainable speed is more like 80 Kbps. Versions of CDMA2000 have been developed by Ericsson and Qualcomm.