sub Read_DOCSIS_SNMP {

        my %DOCSISResults = ();

        my ($OIDName, $MACTableResult) = "";

        my ($Session, $Error ) = Net::SNMP->session(
                -hostname       => $IPAddress,
                -community      => $ReadCommunityString,
                -retries        => 3,
                -timeout        => 5,
                -mtu            => 1544,
                -nonblocking    => 0x1
        );

        if (!defined($Session) ) {
                &ErrorOut("Error starting SNMP Session [DEBUG 1]: $Error");
        }

        $Session->get_request( 
                                -callback       =>      [\&DOCSIS_Callback, \%DOCSISResults], 
                                -varbindlist    =>      [$SystemDescription, $SystemUptime, $MACAddress, $BootFile, 
                                                        $NumberOfInterfaces, $DSFrequency, $DSPowerLevel, $DSModulationType, 
                                                        $DSSNR, $USFrequency, $USPowerLevel, $USChannelWidth, $USChannelID, 
                                                        $UnerroredCodewords, $CorrectedCodewords, $UncorrectableCodewords, 
                                                        $Microreflections, $InterfaceResets, $LostSyncs, 
                                                        $InvalidMaps, $InvalidUCDs, $T1Timeouts, $T2Timeouts, $T3Timeouts, 
                                                        $T4Timeouts, $InvalidRangeRsp, $InvalidRegRsp, $SerialNumber,
                                                        $SystemName, $SystemLocation]
        );

        foreach $OIDName (keys %MACTableOIDs) {
                $MACTableResult = $Session->get_table(
                        -callback       => [    \&MACTable_Callback,
                                                $MACTableOIDs{$OIDName},
                                                $OIDName,
                                                \%MACTableResults,
                                        ],
                        -baseoid        =>      $MACTableOIDs{$OIDName},
                );
        }
        if (!$MACTableResult) {
                        &ErrorOut("SNMP Error while performing MAC table Callback routine: $Error");
        } 

                snmp_dispatcher();
                $Session->close();

        if (!defined($ModemResults{DSPowerLevel})) {
                &ErrorOut("Unable to communicate with device, or it's not a cable modem.");
        }

}