ZyXEL ES-4124 User Guide - Page 50
External Backup Power Supply Connector
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Chapter 3 Hardware Overview " The current rating of the power wires must be greater than 20 Amps. The power supply to which the Switch connects must have a built-in circuit breaker or switch to toggle the power. Figure 15 Terminal Block Pairs Teminal Pair 1 Teminal Pair 2 " When installing the power wire, push it wire firmly into the terminal as deep as possible and make sure that no exposed (bare) wire can be seen or touched. 1 An exposed wire from a DC power source is dangerous. Use extreme care when connecting a DC power source to the device. To connect a power supply: 1 Use a screwdriver to loosen the terminal block captive screws. 2 Connect one end of a power wire to the Switch's RTN (return) pin and tighten the captive screw. 3 Connect the other end of the power wire to the positive terminal on the power supply. 4 Connect one end of a power wire to the Switch's -48V (input) pin and tighten the captive screw. 5 Connect the other end of the power wire to the negative terminal on the power supply. 6 Insert the terminal block plug in the Switch's terminal block header. 3.3.3 External Backup Power Supply Connector The Switch supports external backup power supply (BPS). The backup power supply constantly monitors the status of the internal power supply. The backup power supply automatically provides power to the Switch in the event of a power failure. Once the Switch receives power from the backup power supply, it will not automatically switch back to using the internal power supply even when the power is resumed. 50 ES-4124 User's Guide