Installation manual

PS10270JENAA01 20/10/2004 137

Troubleshooting

The outline of the recommended troubleshooting procedure is:

Fault detection

This section describes the way in which alarm indications are given. If a fault has occurred in the

system, maintenance personnel can detect the fault by:

• Alarm indication

By providing an external alarm indication, the system can route the alarm signal to a

maintenance set or to additional equipment such as an alarm bell. The external alarm device

must be installed and setup. External alarm indication is provided using a contact-to-ground

at the main distribution frame. For more details, see Appendix A, OCT4 card description.

• Lamp indication on circuit cards

When a fault has occurred in the system, maintenance personnel can also detect the fault by

lamp indication on circuit cards. For details of lamp indication on circuit cards, see Appendix

• Fault detection by complaint from an extension user or an operator

When a maintenance person receives a complaint about a problem from an extension user or

an operator, the maintenance person should collect as much information on the problem as

possible, and then troubleshoot the problem according to the procedure shown in this

chapter.

Fault diagnosis and troubleshooting method:

• display on operating console

• fault message

• extension line status display

• external line status display

• lamp indication on circuit cards

• nature of complaint from extension user or operator

Fin

Fault detection method:

• alarm indication

• lamp indication on circuit cards

• complaint from station user or attendant

Fault detection

Fault diagnosis

and

troubleshooting

Begin