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170 <br />D RAFT North Carolina 911 Board Operating Standards — Version 04/14/2011 D RA FT <br />1 (1) The failure of any component of one dispatching means shall not affect the operation of the <br />2 alternative dispatching means and vice versa. <br />3 8.3 Primary dispatch paths and devices upon which transmission and receipt of emergency calls <br />4 depend shall be monitored constantly for integrity to provide prompt warning of trouble that impacts <br />5 operation. <br />6 8.3.1 Trouble signals shall actuate an audible device and a visual signal located at a constantly attended <br />7 location. <br />8 8.3.2 The audible alert trouble signals from the fault and failure monitoring mechanism shall be <br />9 distinct from the audible alert emergency alarm signals. <br />10 8.3.3 The audible trouble signal shall be permitted to be common to several monitored circuits and <br />11 devices. <br />12 8.3.4 A switch for silencing the audible trouble signal shall be permitted if the visual signal continues <br />13 to operate until the silencing switch is restored to the designated normal position. <br />14 8.3.5 Where dispatch systems use computer diagnostic software, monitoring of the primary dispatch <br />15 circuit components shall be routed to a dedicated terminal(s) that meets the following requirements: <br />16 (2) It shall be located within the communications center. <br />17 (3) It shall not be used for routine dispatch activities. <br />18 8.4 The radio communications system shall be monitored in the following ways: <br />19 (1) Monitoring for integrity shall detect faults and failures in the radio communications system. <br />20 (2) Detected faults and failures in the radio communications system shall cause audible or visual <br />21 indications to be provided within the Public Safety Answering Point. <br />22 <br />23 Section 9 Computer -Aided Dispatching (CAD) Systems <br />24 9.1 General. <br />25 9.1.1 PSAPs shall use Computer -Aided Dispatch (CAD) systems. These systems shall conform to the <br />26 items outlined in this Section. <br />27 9.1.2 The CAD system shall contain all hardware and software components necessary for interface <br />28 with the 9 -1 -1 system. <br />29 9.2 Secondary Method. <br />30 9.2.1 A secondary method shall be provided and shall be available for use in the event of a failure of <br />31 the CAD system. <br />Page 17 <br />