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Oakland County reverted to its backup public safety communications system for about three hours Sunday when an old piece of hardware that allows the county mainframe system to communicate with various dispatch consoles went down.

Bill Mullan, spokesman for County Executive Dave Coulter, said Monday that the hardware went down about 7:20 p.m. Sunday, and the primary system was down for about three hours. Twenty-one dispatch consoles were affected in Pontiac and around the county, he said…