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What is a SCM?

April 26, 2017SCM

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What is a SCM?

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SCM stands for Station Class Mark. The SCM is a 4 bit number which holds three different pieces of information. Your cellular telephone transmits this information (and more) to the cell tower. Bit 1 of the SCM tells the cell tower whether your cellphone uses the older 666 channel cellular system, or the newer 832 channel cellular system. The expansion to 832 channels occured in 1988. Bit 2 tells the cellular system whether your cellular telephone is a mobile unit or a voice activated cellular telephone. Bit’s 3 and 4 tell the cell tower what power your cellular telephone should be transmitting on. Bit 1: 0 == 666 channels 1 == 832 channels Bit 2: 0 == Mobile cellular telephone 1 == Voice activated cellular telephone Bit 3/4: 00 == 3.0 watts (Mobiles) 01 == 1.2 watts (Transportables) 10 == .