3Com 3CNJ100 manual Power Over Ethernet

			About the Network Jack
1	Switched ports	Allow up to four devices to be connected to
		the network.
		Port number 1 is also a power-forwarding port;
		it can be used with any standard networking
		device as well as to power a VoIP telephone on
		a network that uses IEEE 802.3af-compatible
		Power Over Ethernet.
2	Slot for adapter	Can be fitted with an adapter plate, which
	plate	can be installed with up to two pass-through
		ports.
3	Adapter plate	Can be used for voice or other networking
	with installed	applications. The port bypasses the
	pass-through	functionality of the switch, allowing you to
	port connector	set up a connection to a separate network
		segment or to connect to an analog or digital
		PBX telephone.
		The adapter plates are available from 3Com.
		However, you must purchase the connectors
		from the manufacturer. See “Installing the
		Adapter Plate and Pass-Through Ports” on
		page 15 for more information.
4	LEDs
			Indicates network connection status.
			Indicates power status.
5	Power socket	Can be used to power the Network Jack with
		a local power supply (available for purchase
		from 3Com); required if your network does
		not support Power Over Ethernet.

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