Black Box LRU4240 Troubleshooting the Unit, Unit Problems, Symptom Probable Cause Solution

Dual Trunk E1 Router

Troubleshooting

TROUBLESHOOTING THE UNIT

This section describes problems you may encounter and provides suggested methods to troubleshoot and resolve the problems.

UNIT PROBLEMS

A list of possible problems is given in Table 11-1, along with suggested solutions for each.

Table 11-1 Unit Problems (1 of 4)

Symptom Probable Cause Solution

The LRU4240 does not power up. • Unit not plugged in.

• Loose power connector.

• PDU (Power Distributor Unit) isn’t powered up/on.

• Blown fuse on LRU4240.

• Reversed power leads from DC supply (standalone).

•Make sure the unit is plugged into a live AC outlet, if the unit is AC powered. If the shelf is DC powered, make sure the respective DC leads are not crossed.

•Check to assure that all fuses are operational; replace as needed. If the problem persists, call Black Box Technical Support for assistance.

The LRU4240 system does not	• Miscellaneous configuration on
dial out when an alarm occurs.	Alarm Menu-8C.
	• Modem strings 8E not correct.
	• Wrong cable.
	• No modem attached.

•Make sure the connection between the COMM Port and the modem is a crossover (null) modem connection.

•A DCE Port is represented the same way as the modem port.

•Make sure Connection is set to Modem and two valid telephone numbers are set in Phone Number 1 and Phone Number 2 in Menu-8C.

•Make sure Block all Alarms is set to No in Menu-8A and the occurring alarm is set to Enabled.

•If the above solutions do not correct the problem, call Black Box Technical Support for assistance.

Dual Trunk E1 Router User’s Guide TECHNICAL: 0118 96 56 000 87