Provides a redundant external power source to networking devices. Features 6 power ports to connect up to 6 external networking devices. Temperature, power and fan speed monitoring. Redundant power supply for managed ZyXEL switches.The ZyXEL BPS120 is a stand-alone backup power unit designed to connect up to 6 external networking devices. When the internal power unit of one such device fails, the BPS provides power instantly to the failing device to prevent it from rebooting. Despite up to six devices can be connected, only one can be powered by BPS120 at the same time. The output rating is 12VDC 120 watts. The single rack-mount BPS-120 unit can combine with the ZyXEL L2/L3 Enterprise switch with inline power, as well as an UPS to create a Centralized Power Provisioning System. Current supporting models are, ZyXEL ES-3124, ES-4124, GS2200-48 ,XGS-4728F and XGS-4258F.