Nortel Meridian Meridian 1, Planning, Installation And Operating Instructions

Page: 471 / 556

Page 452 of 536 Chapter 25 — Fault locating and clearing
553-3121-210 Standard 3.0 January 1999
The contents of the History File are erased during a sysload or if you change
the length of the History File. However, the contents survive an initialization.
You can change the length of the History File with the prompt HIST in the
Configuration Record (LD 17).
If the History File is full, the first messages stored are replaced by incoming
messages. If this happens, the system gives a “file overflow” message at the
start of a printout so you know some information has been replaced by newer
messages.
End user reports
Reports from system users often indicate problems that may not be indicated
by the system. Many faults reported by users, such as a damaged telephone or
data set, are obvious and can be fixed by replacing the damaged equipment.
Some faults are less obvious and may be caused by other equipment, such as
a defective peripheral equipment line or trunk card. To classify the fault in
these cases, check for system messages and visual fault indications. You may
also need to have the user reproduce the problem so you can determine the
sequence of events that led to the fault.
User report indications
Table 59 lists problems that are typically reported by users.