When connecting new subscribers, operators needed to check the optical level of the new ONU. ONUs didn’t appear immediately in the billing system. So, I first enabled a web interface on the OLT with limited access via ACL and a separate account with read permissions. However, the web interface page often opened with significant delays. So, I wrote a PHP script that displays the optical levels of all ONUs in a couple of seconds.
The script content has room for improvement and addition, but it already works (initial version 1.0):
<?php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);
$olts = [
'olt_1' => ['name' => 'City 1', 'ip' => '192.168.5.1', 'community' => 'public'],
'olt_2' => ['name' => 'City 2', 'ip' => '192.168.44.2', 'community' => 'public'],
'olt_3' => ['name' => 'ixnfo.com', 'ip' => '192.168.12.3', 'community' => 'public'],
];
$oids = [
'ifdescr' => "1.3.6.1.2.1.2.2.1.2",
'ifindex' => "1.3.6.1.2.1.17.1.4.1.2",
'mac' => "1.3.6.1.4.1.3320.101.10.1.1.3",
'rx' => "1.3.6.1.4.1.3320.101.10.5.1.5",
'model' => "1.3.6.1.4.1.3320.101.10.1.1.2",
'vendor' => "1.3.6.1.4.1.3320.101.10.1.1.1"
];
$selected_olt_key = $_POST['olt_select'] ?? null;
$data = [];
$error = null;
// The poll occurs ONLY if OLT is selected from the list
if ($selected_olt_key && isset($olts[$selected_olt_key])) {
$ip = $olts[$selected_olt_key]['ip'];
$community = $olts[$selected_olt_key]['community'];
// Execute requests
$raw_data = [];
foreach ($oids as $key => $oid) {
$walk = @snmprealwalk($ip, $community, $oid);
if ($walk === false && $key === 'mac') {
$error = "Unable to retrieve data from OLT $ip. Please check your connection or Community.";
break;
}
$raw_data[$key] = $walk ?: [];
}
if (!$error) {
// Parsing the received data
foreach ($raw_data['ifdescr'] as $oid => $val) {
$idx = substr(strrchr($oid, "."), 1);
$data[$idx]['ifdescr'] = trim($val, '" ');
}
foreach ($raw_data['ifindex'] as $oid => $val) {
$idx = substr(strrchr($oid, "."), 1);
$data[$idx]['ifindex'] = intval($val);
}
foreach ($raw_data['mac'] as $oid => $val) {
$idx = substr(strrchr($oid, "."), 1);
$data[$idx]['mac'] = strtoupper(str_replace(" ", ":", trim(str_replace(["Hex-STRING:", "\""], "", $val))));
}
foreach ($raw_data['rx'] as $oid => $val) {
$idx = substr(strrchr($oid, "."), 1);
$val_num = intval(str_replace("INTEGER:", "", $val));
$data[$idx]['rx'] = ($val_num != 0) ? ($val_num / 10) . " dBm" : "N/A";
}
foreach ($raw_data['model'] as $oid => $val) {
$idx = substr(strrchr($oid, "."), 1);
$data[$idx]['model'] = trim($val, '" ');
}
foreach ($raw_data['vendor'] as $oid => $val) {
$idx = substr(strrchr($oid, "."), 1);
$data[$idx]['vendor'] = trim($val, '" ');
}
ksort($data);
}
}
?>
<!DOCTYPE html>
<html lang="ru">
<head>
<meta charset="UTF-8">
<title>ONU Signal Monitor</title>
<style>
body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: #f0f2f5; padding: 20px; }
.container { max-width: 1100px; margin: 0 auto; background: #fff; padding: 20px; border-radius: 10px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); }
.header-form { text-align: center; border-bottom: 2px solid #eee; padding-bottom: 20px; margin-bottom: 20px; }
select { padding: 10px; width: 300px; border-radius: 5px; border: 1px solid #ccc; font-size: 16px; }
button { padding: 10px 20px; background: #28a745; color: #fff; border: none; border-radius: 5px; cursor: pointer; font-size: 16px; }
button:hover { background: #218838; }
table { border-collapse: collapse; width: 100%; margin-top: 20px; }
th, td { border: 1px solid #dee2e6; padding: 12px; text-align: center; }
th { background: #343a40; color: #fff; }
tr:nth-child(even) { background: #f8f9fa; }
.low-signal { color: #dc3545; font-weight: bold; }
.error-msg { color: #721c24; background: #f8d7da; padding: 15px; border-radius: 5px; text-align: center; }
.info-msg { text-align: center; color: #666; font-style: italic; }
</style>
</head>
<body>
<div class="container">
<div class="header-form">
<form method="POST">
<label for="olt_select"><strong>Select a device to poll:</strong></label><br><br>
<select name="olt_select" id="olt_select">
<option value="">-- OLT --</option>
<?php foreach ($olts as $key => $info): ?>
<option value="<?= $key ?>" <?= ($selected_olt_key == $key) ? 'selected' : '' ?>>
<?= htmlspecialchars($info['name']) ?> (<?= $info['ip'] ?>)
</option>
<?php endforeach; ?>
</select>
<button type="submit">OK</button>
</form>
</div>
<?php if ($error): ?>
<div class="error-msg"><?= $error ?></div>
<?php elseif ($selected_olt_key && !empty($data)): ?>
<h3 style="text-align:center;">Results for <?= htmlspecialchars($olts[$selected_olt_key]['name']) ?></h3>
<table>
<tr>
<th>Index</th>
<th>ifDescr</th>
<th>MAC Address</th>
<th>RX Power</th>
<th>Model / Vendor</th>
</tr>
<?php foreach ($data as $idx => $row):
if (empty($row['mac'])) continue;
// Fixing Warning: Checking for the presence of the 'rx' key
$rx_raw = $row['rx'] ?? '0';
$rx_val = floatval($rx_raw);
// Bad signal highlighting
$rx_class = ($rx_val < -25 && $rx_val != 0) ? 'class="low-signal"' : '';
?>
<tr>
<td><?= $idx ?></td>
<td><?= $row['ifdescr'] ?? '-' ?></td>
<td><code><?= $row['mac'] ?? '-' ?></code></td>
<td <?= $rx_class ?>><?= $row['rx'] ?? 'N/A' ?></td>
<td><?= ($row['vendor'] ?? '') . " " . ($row['model'] ?? '') ?></td>
</tr>
<?php endforeach; ?>
</table>
<?php elseif ($selected_olt_key): ?>
<div class="info-msg">Data not found or device did not respond.</div>
<?php else: ?>
<?php endif; ?>
</div>
</body>
</html>