6.4 ThresholdsIn the PVSR system there are two main threshold types: normal and group thresholds. The former signals an alarm based on an expression containing one or more measurement values. The later one signals an alarm depending on normal alarms rather than measurements: it will alarm when there are more alarms on a normal or virtual site or a given device than the threshold limit specified in the expression. The defined thresholds can be complex expressions using different measurements of different devices of different sites, and the window templates may also play a role at their evaluation; also the group alarms can summarize the result of all possible kinds of alarms. There is a single limitation only: all measurements used in a threshold must have the same measurement cycle; also in the case of group alarms they must use only such thresholds that have the same cycle. The process of adding, viewing and modifying threshold configurations depend on whether that is initiated from the menu (Settings=>Thresholds=>Configuration) or from the equipment page. The two cases are differentiated by the sets of displayed thresholds and selectable objects, and by the displayed measurement names: ˇ From the menu: All normal and virtual site-device, measurements and thresholds can be selected, and the names of the measurements are displayed in the form [site name].[equipment name].[measurement name]. ˇ From the equipment page: Only the measurements and thresholds belonging to the equipment can be selected, in case of group definition only the device as an object can be provided, and the names of the measurements will not be completed with the name of the site and of the equipment. The other difference is, that similarly to the Site and equipment configuration, both our current location in the site equipment hierarchy and a pull down menu with the usual operations appear on the top of the page. Since the first case of the two is more general, the following examples are all based on that. It is also possible to create multiple normal thresholds from a single template, and since this case differs significantly from the manual creation and modification of templates, we will discuss it in a separate subsection. The current chapter describes the thresholds only, the usable threshold window templates are discussed in Chapter 6.13.1. The section first deals with the types that can be assigned to the thresholds, than with the SNMP traps that can be sent when a violation occurs, than with the configuration and finally with the template based creation. 6.4.5 Creating thresholds from templates 6.4.7 Unknown level threshold wait |