Simplex 4100-6031 City Circuit with disconnect switches.

The 4100-6031/6032 City Card is used to annunciate alarms and other urgent indications to remote facilities. When the 4100 goes into alarm, city card circuits are activated, and annunciation immediately occurs at the remote facility. Reverse polarity modules or local energy modules (for reaching the Public Service Fire Communications Center) receive annunciations at the remote site.

Each city circuit module has two circuits, which are configurable for alarm, trouble, or supervisory reporting. In the event of a CPU failure, a city card configured for a trouble output sends a trouble to the city circuit.

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