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pydtm

Python (Euro)DOCSIS (3.0) Traffic Meter

Overview

This tool uses a DVB-C capable video card (e.g. a cheap USB stick) to measure the EuroDOCSIS 3.0 traffic per frequency, allowing you to venture an educated guess about your local segment's utilization.

Data is written to a UDP socket in graphite format.

Requirements

This was tested with cPython 2.7.13 and cPython 3.5.3 using a Hauppauge WinTV soloHD USB stick on a Raspberry Pi 3 running Raspbian/stretch.

It should however work with most Python versions as long as the DVB-C card is supported by your kernel and it's driver complies with the DVBv5 API.

FAQ

How and why does this even work?

EuroDOCSIS 3.0 uses standard DVB-C mechanisms to transport it's data: It's encoded as a standard MPEG Transport Stream on PID 8190 with either 64- or 256- QAM modulation with a symbol rate of 6952ksyms/s. Since cable is a shared medium, determining the total amount of data transferred and comparing this to the total amount possible after FEC (which is about 51Mbit/s for 256-QAM and 34 MBit/s for 64-QAM) will show you how much capacity is used.

How do I determine downstream frequencies?

Take a look at your cable modem's management pages.

Wait, I can read my neighbours data with this?

No, you can't.

Why Python?

I wanted to learn Python.

Why output data to UDP? Why not text files, sockets, ...?

You can easily use tools like netcat to capture the data.

This is downstream only, right?

Yes. You would probably not see other cable modems upstream signals due to... erm, "electrical" stuff.

About

Python (Euro)DOCSIS Traffic Meter

Topics

docsis

Resources

Readme
GPL-3.0 license
Activity

Stars

7 stars

Watchers

2 watching

Forks

3 forks
Report repository

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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pydtm
Python (Euro)DOCSIS (3.0) Traffic Meter
Overview
This tool uses a DVB-C capable video card (e.g. a cheap USB stick) to measure
the EuroDOCSIS 3.0 traffic per frequency, allowing you to venture an educated
guess about your local segment's utilization.
Data is written to a UDP socket in graphite
format.
Requirements
This was tested with cPython 2.7.13 and cPython 3.5.3 using a Hauppauge WinTV
soloHD USB stick on a Raspberry Pi 3 running Raspbian/stretch.
It should however work with most Python versions as long as the DVB-C card
is supported by your kernel and it's driver complies with the DVBv5 API.
FAQ
How and why does this even work?
EuroDOCSIS 3.0 uses standard DVB-C mechanisms to transport it's data: It's
encoded as a standard MPEG Transport Stream on
PID
8190 with either 64- or 256-
QAM
modulation with a symbol rate of 6952ksyms/s. Since cable is a shared medium,
determining the total amount of data transferred and comparing this to the total
amount possible after
FEC (which is about
51Mbit/s for 256-QAM and 34 MBit/s for 64-QAM) will show you how much capacity
is used.
How do I determine downstream frequencies?
Take a look at your cable modem's management pages.
Wait, I can read my neighbours data with this?
No, you can't.
Why Python?
I wanted to learn Python.
Why output data to UDP? Why not text files, sockets, ...?
You can easily use tools like netcat to capture the data.
This is downstream only, right?
Yes. You would probably not see other cable modems upstream signals due to...
erm, "electrical" stuff.
About
Python (Euro)DOCSIS Traffic Meter
Topics
docsis
Resources
Readme
GPL-3.0 license
Activity
Stars
7 stars
Watchers
2 watching
Forks
3 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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pydtm
Python (Euro)DOCSIS (3.0) Traffic Meter
Overview
This tool uses a DVB-C capable video card (e.g. a cheap USB stick) to measure
the EuroDOCSIS 3.0 traffic per frequency, allowing you to venture an educated
guess about your local segment's utilization.
Data is written to a UDP socket in graphite
format.
Requirements
This was tested with cPython 2.7.13 and cPython 3.5.3 using a Hauppauge WinTV
soloHD USB stick on a Raspberry Pi 3 running Raspbian/stretch.
It should however work with most Python versions as long as the DVB-C card
is supported by your kernel and it's driver complies with the DVBv5 API.
FAQ
How and why does this even work?
EuroDOCSIS 3.0 uses standard DVB-C mechanisms to transport it's data: It's
encoded as a standard MPEG Transport Stream on
PID
8190 with either 64- or 256-
QAM
modulation with a symbol rate of 6952ksyms/s. Since cable is a shared medium,
determining the total amount of data transferred and comparing this to the total
amount possible after
FEC (which is about
51Mbit/s for 256-QAM and 34 MBit/s for 64-QAM) will show you how much capacity
is used.
How do I determine downstream frequencies?
Take a look at your cable modem's management pages.
Wait, I can read my neighbours data with this?
No, you can't.
Why Python?
I wanted to learn Python.
Why output data to UDP? Why not text files, sockets, ...?
You can easily use tools like netcat to capture the data.
This is downstream only, right?
Yes. You would probably not see other cable modems upstream signals due to...
erm, "electrical" stuff.
About
Python (Euro)DOCSIS Traffic Meter
Topics
docsis
Resources
Readme
GPL-3.0 license
Activity
Stars
7 stars
Watchers
2 watching
Forks
3 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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pydtm
Python (Euro)DOCSIS (3.0) Traffic Meter
Overview
This tool uses a DVB-C capable video card (e.g. a cheap USB stick) to measure
the EuroDOCSIS 3.0 traffic per frequency, allowing you to venture an educated
guess about your local segment's utilization.
Data is written to a UDP socket in graphite
format.
Requirements
This was tested with cPython 2.7.13 and cPython 3.5.3 using a Hauppauge WinTV
soloHD USB stick on a Raspberry Pi 3 running Raspbian/stretch.
It should however work with most Python versions as long as the DVB-C card
is supported by your kernel and it's driver complies with the DVBv5 API.
FAQ
How and why does this even work?
EuroDOCSIS 3.0 uses standard DVB-C mechanisms to transport it's data: It's
encoded as a standard MPEG Transport Stream on
PID
8190 with either 64- or 256-
QAM
modulation with a symbol rate of 6952ksyms/s. Since cable is a shared medium,
determining the total amount of data transferred and comparing this to the total
amount possible after
FEC (which is about
51Mbit/s for 256-QAM and 34 MBit/s for 64-QAM) will show you how much capacity
is used.
How do I determine downstream frequencies?
Take a look at your cable modem's management pages.
Wait, I can read my neighbours data with this?
No, you can't.
Why Python?
I wanted to learn Python.
Why output data to UDP? Why not text files, sockets, ...?
You can easily use tools like netcat to capture the data.
This is downstream only, right?
Yes. You would probably not see other cable modems upstream signals due to...
erm, "electrical" stuff.
About
Python (Euro)DOCSIS Traffic Meter
Topics
docsis
Resources
Readme
GPL-3.0 license
Activity
Stars
7 stars
Watchers
2 watching
Forks
3 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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Repository files navigation
pydtm
Python (Euro)DOCSIS (3.0) Traffic Meter
Overview
This tool uses a DVB-C capable video card (e.g. a cheap USB stick) to measure
the EuroDOCSIS 3.0 traffic per frequency, allowing you to venture an educated
guess about your local segment's utilization.
Data is written to a UDP socket in graphite
format.
Requirements
This was tested with cPython 2.7.13 and cPython 3.5.3 using a Hauppauge WinTV
soloHD USB stick on a Raspberry Pi 3 running Raspbian/stretch.
It should however work with most Python versions as long as the DVB-C card
is supported by your kernel and it's driver complies with the DVBv5 API.
FAQ
How and why does this even work?
EuroDOCSIS 3.0 uses standard DVB-C mechanisms to transport it's data: It's
encoded as a standard MPEG Transport Stream on
PID
8190 with either 64- or 256-
QAM
modulation with a symbol rate of 6952ksyms/s. Since cable is a shared medium,
determining the total amount of data transferred and comparing this to the total
amount possible after
FEC (which is about
51Mbit/s for 256-QAM and 34 MBit/s for 64-QAM) will show you how much capacity
is used.
How do I determine downstream frequencies?
Take a look at your cable modem's management pages.
Wait, I can read my neighbours data with this?
No, you can't.
Why Python?
I wanted to learn Python.
Why output data to UDP? Why not text files, sockets, ...?
You can easily use tools like netcat to capture the data.
This is downstream only, right?
Yes. You would probably not see other cable modems upstream signals due to...
erm, "electrical" stuff.
About
Python (Euro)DOCSIS Traffic Meter
Topics
docsis
Resources
Readme
GPL-3.0 license
Activity
Stars
7 stars
Watchers
2 watching
Forks
3 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Repository files navigation
pydtm
Python (Euro)DOCSIS (3.0) Traffic Meter
Overview
This tool uses a DVB-C capable video card (e.g. a cheap USB stick) to measure
the EuroDOCSIS 3.0 traffic per frequency, allowing you to venture an educated
guess about your local segment's utilization.
Data is written to a UDP socket in graphite
format.
Requirements
This was tested with cPython 2.7.13 and cPython 3.5.3 using a Hauppauge WinTV
soloHD USB stick on a Raspberry Pi 3 running Raspbian/stretch.
It should however work with most Python versions as long as the DVB-C card
is supported by your kernel and it's driver complies with the DVBv5 API.
FAQ
How and why does this even work?
EuroDOCSIS 3.0 uses standard DVB-C mechanisms to transport it's data: It's
encoded as a standard MPEG Transport Stream on
PID
8190 with either 64- or 256-
QAM
modulation with a symbol rate of 6952ksyms/s. Since cable is a shared medium,
determining the total amount of data transferred and comparing this to the total
amount possible after
FEC (which is about
51Mbit/s for 256-QAM and 34 MBit/s for 64-QAM) will show you how much capacity
is used.
How do I determine downstream frequencies?
Take a look at your cable modem's management pages.
Wait, I can read my neighbours data with this?
No, you can't.
Why Python?
I wanted to learn Python.
Why output data to UDP? Why not text files, sockets, ...?
You can easily use tools like netcat to capture the data.
This is downstream only, right?
Yes. You would probably not see other cable modems upstream signals due to...
erm, "electrical" stuff.
About
Python (Euro)DOCSIS Traffic Meter
Topics
docsis
Resources
Readme
GPL-3.0 license
Activity
Stars
7 stars
Watchers
2 watching
Forks
3 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Repository files navigation
pydtm
Python (Euro)DOCSIS (3.0) Traffic Meter
Overview
This tool uses a DVB-C capable video card (e.g. a cheap USB stick) to measure
the EuroDOCSIS 3.0 traffic per frequency, allowing you to venture an educated
guess about your local segment's utilization.
Data is written to a UDP socket in graphite
format.
Requirements
This was tested with cPython 2.7.13 and cPython 3.5.3 using a Hauppauge WinTV
soloHD USB stick on a Raspberry Pi 3 running Raspbian/stretch.
It should however work with most Python versions as long as the DVB-C card
is supported by your kernel and it's driver complies with the DVBv5 API.
FAQ
How and why does this even work?
EuroDOCSIS 3.0 uses standard DVB-C mechanisms to transport it's data: It's
encoded as a standard MPEG Transport Stream on
PID
8190 with either 64- or 256-
QAM
modulation with a symbol rate of 6952ksyms/s. Since cable is a shared medium,
determining the total amount of data transferred and comparing this to the total
amount possible after
FEC (which is about
51Mbit/s for 256-QAM and 34 MBit/s for 64-QAM) will show you how much capacity
is used.
How do I determine downstream frequencies?
Take a look at your cable modem's management pages.
Wait, I can read my neighbours data with this?
No, you can't.
Why Python?
I wanted to learn Python.
Why output data to UDP? Why not text files, sockets, ...?
You can easily use tools like netcat to capture the data.
This is downstream only, right?
Yes. You would probably not see other cable modems upstream signals due to...
erm, "electrical" stuff.
About
Python (Euro)DOCSIS Traffic Meter
Topics
docsis
Resources
Readme
GPL-3.0 license
Activity
Stars
7 stars
Watchers
2 watching
Forks
3 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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pydtm
Python (Euro)DOCSIS (3.0) Traffic Meter
Overview
This tool uses a DVB-C capable video card (e.g. a cheap USB stick) to measure
the EuroDOCSIS 3.0 traffic per frequency, allowing you to venture an educated
guess about your local segment's utilization.
Data is written to a UDP socket in graphite
format.
Requirements
This was tested with cPython 2.7.13 and cPython 3.5.3 using a Hauppauge WinTV
soloHD USB stick on a Raspberry Pi 3 running Raspbian/stretch.
It should however work with most Python versions as long as the DVB-C card
is supported by your kernel and it's driver complies with the DVBv5 API.
FAQ
How and why does this even work?
EuroDOCSIS 3.0 uses standard DVB-C mechanisms to transport it's data: It's
encoded as a standard MPEG Transport Stream on
PID
8190 with either 64- or 256-
QAM
modulation with a symbol rate of 6952ksyms/s. Since cable is a shared medium,
determining the total amount of data transferred and comparing this to the total
amount possible after
FEC (which is about
51Mbit/s for 256-QAM and 34 MBit/s for 64-QAM) will show you how much capacity
is used.
How do I determine downstream frequencies?
Take a look at your cable modem's management pages.
Wait, I can read my neighbours data with this?
No, you can't.
Why Python?
I wanted to learn Python.
Why output data to UDP? Why not text files, sockets, ...?
You can easily use tools like netcat to capture the data.
This is downstream only, right?
Yes. You would probably not see other cable modems upstream signals due to...
erm, "electrical" stuff.
About
Python (Euro)DOCSIS Traffic Meter
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docsis
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GPL-3.0 license
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