– Im per ial ▁County ▁Regional ▁Communic ations ▁System , ▁known ▁locally ▁as ▁the ▁R CS , ▁provides ▁wireless ▁ 8 0 0   M Hz ▁voice ▁( radio ) ▁and ▁data ▁communic ations — on ▁separate ▁networks — to ▁over ▁ 2 0 0 ▁local , ▁county , ▁state , ▁and ▁federal ▁public ▁safety ▁and ▁public ▁service ▁ag encies ▁in ▁San ▁Diego ▁County , ▁California ▁and ▁Imperial ▁County , ▁California . ▁The ▁day - to - day ▁operations ▁are ▁managed ▁by ▁the ▁W ire less ▁Services ▁Division ▁of ▁the ▁San ▁Diego ▁County ▁Sher iff ' s ▁Department . ▁ ▁The ▁R CS ▁voice ▁network ▁is ▁a ▁Motor ola ▁Type ▁II ▁Sm art Zone ▁ 8 0 0   M Hz ▁tr unk ed , ▁sim ul cast ▁system . ▁It ▁supports ▁mixed ▁mode ▁analog ▁and ▁digital ▁communic ations ▁and ▁is ▁digital ▁encryption ▁capable . ▁ ▁The ▁R CS ▁data ▁network ▁is ▁provided ▁to ▁the ▁County ▁of ▁San ▁Diego ▁Sher iffs ▁Department ▁only , ▁and ▁uses ▁the ▁Motor ola ▁ 7 0 0   M Hz ▁conventional ▁High ▁Performance ▁Data ▁system . ▁It ▁provide ▁wireless ▁data ▁access ▁to ▁computer ized ▁applications , ▁such ▁as ▁computer ▁a ided ▁dispatch ▁( C AD ), ▁autom ated ▁law ▁enfor cement ▁databases , ▁and ▁unit ▁mess aging . ▁ ▁History ▁ ▁Tim eline ▁of ▁notable ▁events ▁December ▁ 8 , ▁ 1 9 9 2 ▁- ▁San ▁Diego ▁County ▁Board ▁of ▁Super vis ors ▁approved ▁the ▁R CS ▁business ▁plan ▁March ▁ 7 , ▁ 1 9