Cisco 4948 Installation Guide - Page 79

Appendix A Power Supply Specifications 300 W AC-Input Power Supply (PWR-C49E-300AC-R) Table A-1 lists the specifications for the 300 W AC-input power supply (PWR-C49E-300AC-R). Table A-1 300 W AC-Input Power Supply Specifications Item AC-input type AC-input voltage AC-input current AC-input frequency Branch circuit requirements Power supply output Output holdup time kVA rating1 Power supply fan Specification • Autoranging input with power factor correction (PFC). • Power factor correction is a standard feature. PFC reduces the reactive component in the source AC current allowing higher power factors and lower harmonic current components. • Low-line (120 VAC nominal)-85 VAC (min) to 132 VAC (max) • High-line (230 VAC nominal)-170 VAC (min) to 264 VAC (max) • 4 A @ 100 VAC (maximum) • 2 A @ 240 VAC (maximum) 47 to 63 Hz Each chassis power supply should have its own dedicated, fused-branch circuit: • For North America-15 A • For International-Circuits sized to local and national codes • All AC power supply inputs are fully isolated. - Source AC can be out of phase between multiple power supplies in the same chassis, which means that PS1 can be operating from phase A and PS2 can be operating from phase B. - For high-line operation, the power supply operates with the line conductor wired to a source AC phase and the neutral conductor wired either to neutral or to another source AC phase as long as the net input voltage is in the range of 170 to 264 VAC. 25 A @+12 VDC 20 ms minimum 0.375 kVA • One temperature-controlled, variable-speed fan • Airflow direction-Back to front • The power supply fan has four speed settings. The speed settings are dependent on the air temperature detected by the inlet air temperature sensor mounted in the chassis. See Table A-2 for inlet temperature ranges and corresponding fan speeds. OL-21561-02 Catalyst 4948E and Catalyst 4948E-F Switch Installation Guide A-3