Cisco WS-X4224-RJ45V= Network Switch Component Networking

The Cisco Catalyst 4500 Series offers line cards, power supplies, and accessories required to deploy and operate a standards-based Power over Ethernet (PoE) internetwork. 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 may be installed.
Although all references to "PoE," "inline-power," and "voice" power supplies and line cards are synonymous, there are only two versions: Cisco prestandard and IEEE 802.3af compliant. Every Cisco Catalyst 4500 Series chassis and PoE power supply supports the IEEE 802.3af standard, and the Cisco prestandard power implementation ensuring backward compatibility with existing Cisco powered devices. All IEEE 802.3af compliant line cards can distinguish an IEEE or Cisco prestandard powered device from an unpowered network interface card (NIC); ensuring power is applied only when an appropriate device is connected.

Enterprise and commercial: Designed to power IP phones, wireless base stations, video cameras, and other IEEE-compliant powered devices