Service Uptime is the proportion of time, during a given time period Tk, that the service is working from the perspective of the Subscriber, excluding any pre-agreed exceptions, for example, maintenance intervals. The value of this Service Attribute is a 3-tuple <ts, T, U> where:
- ts is a time that represents the date and time that evaluation of Service Uptime starts for the SWVC
- T is a time duration, e.g., 1 month or 2 weeks, that is used in conjunction with ts to specify time intervals for determining when the Service Uptime Objective is met. Note that the units for are not constrained; in particular, “1 month” is an allowable value for , corresponding to a calendar month, e.g., from midnight on the 10th of one month up to but not including midnight the 10th of the following month.
- U is the objective for Service Uptime expressed as a percentage.
The time intervals are specified by the parameters ts and T in the value of this Service Attribute. One time period, denoted T0, starts at time ts and has duration T. Each subsequent time period, denoted Tk, starts at time ts + kT where k is an integer, and has duration T; in other words, each new time period starts as soon as the previous one ends. Service Uptime is evaluated for each time period Tk, so one can say that for a given Tk, the performance objective is either met or not met
The definition of Service Uptime is expressed in [R14].
[R14] The Service Uptime for an SWVC during time period Tk MUST be defined as follows:
- Let O(Tk) be the total duration of outages during the time period Tk.
- Let M(Tk) be the total duration of maintenance periods during the time period Tk.
- Then define the Service Uptime U(Tk) =
An example of the value for this Service Attribute would be:
<”10-Jul-2018 00:00:00”, “1 month”, 99.8%>
[R15] The SWVC Service Uptime Objective for a given time interval, Tk, MUST be considered met if U(Tk) is greater than or equal to the element in the value of this Service Attribute for time interval Tk.
PUBLISHED
MEF-SDCP Exam Study Reference
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