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Station Control Unit (SCU)
• An integral component of the LAFD Dispatch Communications Network (DCN)
• Located at every fire station and facility
• Remotely controlled by a Computer Aided Dispatch (CAD) System to alert emergency rescue teams at the corresponding fire stations of the incoming dispatch call
• Connected with two dedicated communications links, one is used to deliver dispatch call
• 56K ADN line (Advanced Digital Network) from the local telephone company is used for voice communications link.
• Data line (Another 56K ADN line from the Telephone company) is sub-rated to 9.6Kbps by passing though Sub Rate Data Multiplexer (SRDM). One of the outputs of SRDM is connected to SCU.
• Functions of SCU are to activate fire station bells, the dispatch printer, PA system, turn on house lights, ring dispatch phones and answer back in any combination as required by a dispatch.

Public Addressing System (PA System)
• Installed at Cabinet A where equipment such as SCU, power supply, PA amplifier, SRDM are installed
• Controls the operation of speakers, microphones, buzzers, front door buzzers and master input of audio amplifier
• The audio output of SCU is connected to the input of PA panel.
• Speakers outside the building are muted at night time by Yard Switch, one of the switches of 7 gang gong panel.
Answer Back
• Installed near the location of gong panel
• Acknowledges a response of the dispatch
• Enables the night dispatched circuit for different dispatch services

Night Light Controller
• Installed at the cabinet B where punch down blocks are installed.
• To turn on the night light when an audio dispatch comes and the Ready switch is "ON"
• Timer is in the night light controller