Table below shows 900 MHz band spectrum is allocated for telecommunication service providers in Malaysia. The GSM spectrum is distributed based on Frequency Division Duplex (FDD) to provide full-duplex voice and control channel. Telecom service Maxis Digi Celcom Lower band 880MHz -- 886MHz And 905MHz -- 915MHz 886MHz-888MHz 890MHZ-915MHz Upper band 925MHz - 931MHz And 950MHZ-960MHz 931MHz-933MHz 933MHZ-950MHz Frequency reuse 7 4 a) State the band that operates the reverse link communication. Justify your reason. b) If the 1 MHz of the allocated spectrum is dedicated to the control channel for the whole band, calculate the number of the available voice channel.

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