PSTN Central Unit 2.1202.1 PSTN Central UnitDescriptionPower supplyGreen OK (battery full)Green flashing Battery chargingRed Battery failureOff Power failure, more than 1 hour ofoperating time remainsRed flashing Power failure, less than 1 hour ofoperating time remainsRed flashing afterpower upAudio unit FW upgrade proceedingTelephone lineGreen Line OK, ready (on-hook)Green flashing Line picked up (off=hook, call)Red Line failure (no dialtone)CommunicationNo light Relax (ALARM reset)Yellow ALARM activated (calling)Green Call confirmed (ALARMannounced) / Fireman activatedGreen flashing Incoming callYellow flashing TriphonyFast green flashing Programming from dispatching officeFast yellow flashingAlternateyellow/greenflashingProgramming from machine roomBus busyOld type New typeBus connector(to audio units)Telephone lineconnectorSupplyconnectorBatterySwitch(ON/OFF)USB connector(for programming, upgrading etc.)Warning Do not open the CU during the warranty period. Later, open for battery replacement only.Figure 2.2Central UnitConnectorsFigure 2.1Central UnitLED Indicators
