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Dual Trunk E1 Router
Dual Trunk E1 Router User’s Guide TECHNICAL: 0118 96 56 000 87
Troubleshooting 11
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
dial out when an alarm occurs.
• Miscellaneous configuration on
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.