if (isset($entry['cmEthernetNetPortMediaType']) && $entry['cmEthernetNetPortMediaType'] == 'fiber') {
        // Discover receive power level
        $oidRx = '.1.3.6.1.4.1.2544.1.12.5.1.5.1.34.' . $index . '.3';
        $oidTx = '.1.3.6.1.4.1.2544.1.12.5.1.5.1.33.' . $index . '.3';
        $currentRx = $pre_cache['adva_fsp150_perfs'][$index . '.3']['cmEthernetNetPortStatsOPR'];