City officials say only 20 percent of service was affected while Fraternal Order of Police leaders say service was nonexistent, but John McGrodie of the FOP says a backup system did go into operation.
Police Commissioner Charles Ramsey and other officials were summoned to headquarters while the main system was down.
Chief Inspector Michael Feeney says the failure was not caused by the Motorola digital radio system, which city officials recently agreed to upgrade for $34 million.
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