Operating frequencies

iDEN is advised and accountant to accomplish on alone frequencies that may not be contiguous. iDEN operates on 25 kHz channels, but alone occupies 20 kHz in adjustment to accommodate arrest aegis via bouncer bands. By comparison, TDMA Cellular (Digital AMPS) is accountant in blocks of 30 kHz channels, but anniversary discharge occupies 40 kHz, and is able of confined the aforementioned amount of subscribers per approach as iDEN. iDEN uses frequency-division duplexing to address and accept signals separately, with address and accept bands afar by 39 MHz, 45 MHz, or 48 MHz depending on the abundance bandage getting used.1

iDEN supports either three or six interconnect users (phone users) per channel, and six celerity users (push-to-talk users) per channel, application time analysis assorted access. The address and accept time slots assigned to anniversary user are advisedly account in time so that a individual user never needs to address and accept at the aforementioned time. This eliminates the charge for a duplexer at the adaptable end, back time-division duplexing of RF area acceptance can be performed.