CyberData networking devices for VoIP are designed to expand a single network drop into two separate connections. Our pass-through PoE technology allows users to use a single 802.3at or 802.3af network switch and passes that power through to one or two of the downstream switch ports with our 2-Port Gigabit switch. The 2-Port Gigabit Ethernet Switch enables users of a PC to split a single Gigabit Ethernet port into two Gigabit Ethernet ports. The power for the switch is supplied by the PC's USB port. This can be helpful for adding a VoIP phone to a cubical or workspace with a PC connected to a single network drop. The advantage of the CyberData products is that they do not need an external power supply.