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PoE provides -48 VDC power over standard Category 5 unshielded twisted-pair (UTP) cable up to 100 meters when an IEEE 802.3af-compliant or Cisco prestandard powered device is attached to the PoE line-card port. Instead of requiring wall power, attached devices such as IP phones, wireless base stations, video cameras, and other IEEE-compliant appliances can use power provided from the Cisco Catalyst 4500 Series PoE line cards. This capability gives network administrators centralized control over power and eliminates the need to install outlets in ceilings and other out-of-the-way places where a powered device can be installed.
The dual input 4200 WAC power supply is designed to accept either 100V AC circuits or 200V AC circuits. The 4200W supply is the largest internal AC power supply available for the Catalyst 4500 series switch. Customer planning large scale PoE deployments can use the dual inputs in the 200V AC configuration. Customers planning for the future can deploy the 4200W power supply with a single 100V circuit.