Section B: Calculating the Multimode Component Variance Loss
The fiber cable manufacturer
should provide the values used to determine variance loss. This loss,
attributable to manufacturing tolerances or installation methods (or
both), is induced by connections and splices.
- If the manufacturer's data is not available, use the typical component loss values from Table 1.
- If the manufacturer has provided only worst-case specification data, it includes the variance loss. Enter a value of zero on the work sheet for the Total Component Variance Loss.
- If the manufacturer provides a standard deviation (σ) value, use the square of this value to determine the component variance loss. For example, if σ equals 0.24, then enter a value of 0.06 (0.24 squared) on the worksheet for the Total Component Variance Loss.
Connections: Multiply the connection variance value by the total number of connections in the link. Connections to FICON®-capable, or coupling facility channel-capable devices are included in the device specification and should not be included in the connection calculation.
Splice Variance: Multiply the splice variance value by the total number of splices in the link.