153.1 General information about PSTAT

1. The AMO PSTAT is used to display and reset the counters of the peripheral statistics.

2. The control tables of the peripheral statistics can also be displayed and changed.

When the peripheral statistics are called, the fault analysis (FA-LTG) reacts to error messages, to eradicate the causes of faults that could adversely affect the system and jeopardize normal operation. Such faults can be hardware faults or software errors which frequently occur and place an unnecessary load on the system, e.g. recurrence of line alarms. Units at which these faults originate are eliminated after a statistical overload by means of a force remove.

The statistical evaluation of faults also prevents message data overflow producing an unnecessarily high system loading.

The statistics counters are not cross-signaled to other processors or stored on hard disk. For all restarts, except for a simple soft restart, the contents of the statistics counter are lost.

The peripheral statistics are designed for use within the system as a whole, but they are implemented to respond only to signals from the peripherals. The statistics are implemented as a separate program package inside the FA-LTG subsystem and are called from this subsystem (TOOL of the FA-LTG).

In the peripheral statistics for fault analysis, each peripheral element (module, circuit, terminal) has up to 4 fault counters.

The task of the peripheral statistics is to record the statistics (increment counter), inform the caller (FA-LTG) if the counter limit is exceeded and to monitor the statistics counters. The dependability reaction on overload is covered solely by the fault analysis (FA-LTG). At present, the statistics counters of levels BOARD and CIR are used as follows:


COUNT1	so-called pairs of module restore and module remove messages
COUNT2	Messages which could cause message data overflow
COUNT3	These counters can be byte- or word-counters:
COUNT4	used as byte-counter, they also display messages which could cause message data overflow; used as word-counter (at DIUS2, DIUS7, STMA, DIUC, DIUC64, and STMD2) they serve as reference clock counters

Both types of faults are counted individually for module, circuit and terminal in separate counters. If the thresholds are exceeded, the corresponding modules, circuits or terminals are removed from service by FA-LTG. Removal is signaled with STAT-OVERFLOW.
The statistics counters are then decremented again at set intervals.

The threshold values have been set to a level high enough to block out only those elements which would excessively load the system.

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