pre-eq

The best known solve is to send technicians into field/plant and using some kind of perl/bash script check eg. every 2-3 seconds the snr.
Then using this readings technician disconnects half of the line simply by removing upstream diplex or amp. Then again half pf line and so on... Believe mi there is no automatic way in any reasonable money - technician is fast enough (don't forget to give him mobile phone :).

you can use the cablelabs Proactive Network Maintenance Reference Implementation found at http://cablelabs.com/cablemodem/specifications/ri_implementations.html

download the Pre-equalizationAnalyzer-RI-EXECUTABLE-PACKAGE-v1.x.zip and install it on a web server

you can then grab the preeq info and paste it in or if you have PHP 5.4.0 or greater you can use the following script saving it as equalization.php in the PreEqDemoWeb folder

<?php

header("Content-Type: text/plain");
$ip = $_REQUEST["ip"];
@$index = $_REQUEST["ifIndex"];
set_time_limit(0);
$session2 = new SNMP(SNMP::VERSION_2C, "$ip", "private");
//$session2->oid_output_format = SNMP_OID_OUTPUT_SUFFIX;
$session2->quick_print = 1;
//echo(trim(preg_replace("/\s|\"/", "", $session->get("1.3.6.1.2.1.10.127.1.2.2.1.17.2"))));
$equalizationData = ($session2->walk("1.3.6.1.2.1.10.127.1.3.3.1.8"));
$macAddress = ($session2->walk("1.3.6.1.2.1.10.127.1.3.3.1.2"));
$ipAddress = ($session2->walk("1.3.6.1.2.1.10.127.1.3.3.1.3"));
$ifIndex = ($session2->walk("1.3.6.1.2.1.10.127.1.3.3.1.5"));
$x = 0;
foreach ($equalizationData as $key => $value) {
$macKey = preg_replace("/8(\.[0-9]+)$/", "2$1", $key);
$ipKey = preg_replace("/8(\.[0-9]+)$/", "3$1", $key);
$ifIndexKey = preg_replace("/8(\.[0-9]+)$/", "5$1", $key);
$eqdata = trim(preg_replace("/\s|\"/", "", $value));
if (!empty($eqdata)) {
if (isset($index)) {
if ($ifIndex[$ifIndexKey] === $index) {
echo $ipAddress[$ipKey] . "," . trim(preg_replace("/\s|\"/", "", $macAddress[$macKey])) . "," . $ifIndex[$ifIndexKey] . "," . getCMEqual($ipAddress[$ipKey]) . "," . $eqdata . "\r\n ";
$x++;
}
} else {
echo $ipAddress[$ipKey] . "," . trim(preg_replace("/\s|\"/", "", $macAddress[$macKey])) . "," . $ifIndex[$ifIndexKey] . "," . getCMEqual($ipAddress[$ipKey]) . ",". $eqdata . "\r\n ";
$x++;
}
}
}
function getCMEqual($ip) {
$session = new SNMP(SNMP::VERSION_2C, "$ip", "public", 100000);
//$session2->oid_output_format = SNMP_OID_OUTPUT_SUFFIX;
$session->quick_print = 1;
$eqdata = trim(preg_replace("/\s|\"/", "", @$session->get("1.3.6.1.2.1.10.127.1.2.2.1.17.2")));
return (empty($eqdata)) ? "0": $eqdata ;
}
//1.3.6.1.2.1.10.127.1.1.4.1.$ifIndex CMTS Equalization data
//
//1.3.6.1.2.1.10.127.1.3.3.1.8.$modemIndex CMTS Equalization Data
?>

first to the right of the datafile box select all the buttons except lat/lon (only preeq is selected by default) and then in the datafile field on the demo you enter equalization.php?ip=192.168.0.1 where 192.168.0.1 is the cmts ip to get all the info from the modems, or equalization.php?ip=192.168.0.1&ifIndex=105 which will only get the modems on upstream interface with ifIndex of 105. after typing in the url press enter to start it.

The script can take a while to run (approx a min per 500 modems) and a beautiful popup box with nothing in it comes up when you run it but it does work.

once the data is loaded you can use the Red/orange and green balloons and the refresh button to the left of the balloons to filter the modems you want.

Check out what we have as a solution. One of the first hosted software to market called PreEqualization Analyzer. Check out details here: http://www.zcorum.com/solutions/broadband-diagnostics/preequalization-an...

We also have Upstream and Downstream Spectrum software available as well.

Does anyone still have a link to this download, or the zip file lingering around? If i could find it I'd pretty well be willing to put it up in a permanent location for everyone else to have access to.

Commercial implementations of that PNM demo are available these days eg https://nimblethis.com/

* equalizer analysis tool, pretty obvious they took that demo and fixed / improved it. Not really going to help you locate noise, but I guess would help locate other plant defects.

* live upstream spectrum analyser, using data from the CMTS (no extra hardware needed). Could be handy for field techs to watch the SNR readouts on their phone/tablet why disconnecting coax legs in the field?

I believe other companies like zcorum are reselling the nimble-this tools.

Hi! Anyoane has Pre-equalizationAnalyzer-RI-EXECUTABLE-PACKAGE-v1.x.zip ?
Thanks!