3Com 3C10220 manual Solving NBX, Telephone, To resolve the problem

30CHAPTER 3: TROUBLESHOOTING

Solving NBX	If power is not reaching an NBX Business Telephone, use the information
Telephone	in Table 7 to resolve the problem.
Problems
	Table 7 Solving NBX Business Telephone Problems
	Problem	Possible Cause	Suggested Action
	No characters appear in	Faulty connection	■ Verify all physical connections.
	the telephone LCD display.
		The telephone may	■ Supply power to the
		be faulty.	telephone using the standard
			external adapter that comes
			with the telephone. If any
			characters appear in the LCD
			display, the telephone is not
			faulty.
			Note: You do not need to
			connect the telephone to the
			Ethernet to perform this check.
		Faulty Ethernet	■ Take the telephone and the
		cable between the	Ethernet cable to the EPS
		telephone and the	location and connect the
		wall jack	telephone directly to an EPS
			output port (one of the top
			row of connectors).
			■ If information does not appear
			in the LCD display, replace the
			Ethernet patch cable, being
			sure to use one that is wired
			for all eight pins.
			Note: If information appears in
			the LCD display, the EPS,
			telephone, power splitter, and
			Ethernet patch cable are fully
			functional.
		Faulty EPS port	■ Plug the telephone into
			another EPS output port.
		Faulty power	■ Replace the power splitter.
		splitter

Faulty connection between the wall jack and the EPS

■Verify that the Ethernet wall jack is connected to the EPS. If that is not the source of the problem, check the cables and connections between the wall jack and the EPS.