var nbhdAvgRx = execution.getVariable("nbhdAvgRx") == null ? Number(0.00)
    : Number(execution.getVariable("nbhdAvgRx"));
var nbhdAvgTx = execution.getVariable("nbhdAvgTx") == null ? Number(0.00)
    : Number(execution.getVariable("nbhdAvgTx"));

    if( ontStatus !== null && ontStatus == "Operational") {
        if (opticalRx !== null) {
            nbhdAvgRx += Number(opticalRx);
        }
        if (opticalTx !== null) {
            nbhdAvgTx += Number(opticalTx);
        }
    }
    execution.setVariable("nbhdAvgTx", nbhdAvgTx);
    execution.setVariable("nbhdAvgRx", nbhdAvgRx);