3Com 500 manual Isdn

		Troubleshooting	1-49
Malfunction	Remedy
The ISDN OK LED	Follow the procedures as outlined for “The POWER LED does
does not light.	not light.”
	a)	Ensure that the AccessBuilder 500 is powered up and the
		POWER LED is lit.
	b)	Confirm that the ISDN UTP cable is correctly connected,
		and that the cable is attached to the socket marked
		ISDN.
	c)	Confirm that the ISDN line socket that is connected to
		the unit is conveying an ISDN service.
	d)	Try making an ISDN call using a telephone connected to
		the ISDN line to confirm if the line is operational.
	e)	If the LED still fails to light, plug the UTP cable into an
		alternate ISDN service socket to confirm that it functions.
	f)	Try using an alternate UTP cable to connect the unit to
		the ISDN service socket.
If other LEDs do	During normal operation the remaining unit LEDs should
not light during	light and extinguish depending on the action being taken. If
operation of the	the LEDs fail to light in accordance with their function (refer
unit.	to “Front Panel” on page 1-9), then contact your supplying
	3Com reseller.

The local unit does not connect to the remote unit.

a)Check the connections between the unit, the network, or PC and the ISDN line.

b)Confirm that the line is working by connecting a telephone to the ISDN line to make a call.

c)Check that the number which you are dialling is connected to the remote unit and that the unit is configured to be able to answer calls.