The Problem

Your cable modem tracks signal quality data — how strong your connection is, how clean the signal is, whether errors are accumulating. It's all buried in the modem's web interface. But that data isn't actionable.

No history — you see a snapshot of right now, not what happened at 2am when your connection dropped
No alerts — the modem won't tell you when signal quality degrades or errors start climbing
No proof — when you call your ISP, "the internet is slow" isn't evidence they can act on
No correlation — you can't connect "Zoom dropped at 3pm" with signal issues you weren't watching

The Solution

Cable Modem Monitor pulls signal data directly from your modem and brings it into Home Assistant. Track connection health over time with historical graphs that catch the problems you'd otherwise miss.

Cable Modem Status Dashboard — Connection status, uptime, latency, and error counts at a glance

Downstream Power Levels Graph — Signal strength across all channels — spot imbalances instantly

Signal-to-Noise Ratio Graph — Signal quality tracking helps identify issues before they cause drops

Modem Latency Graph — Response time monitoring catches slowdowns as they happen

Error Tracking Graph — Error trends reveal developing problems over days and weeks

Why It Matters

Proof when you need it

Show your ISP actual data — signal quality dropping, error counts climbing. Evidence is harder to dismiss than "it feels slow."

Patterns over time

Catch the 2am drops and intermittent issues. Problems that vanish by the time you check are captured in the graphs.

One integration, 15 modems

Arris, Motorola, Netgear, Technicolor — write once, support many. Each parser is tested against real device captures.

Home Assistant automation

Set alerts for signal degradation. Get notified before problems become outages.

Supported Modems

Manufacturer	Model	DOCSIS	Speed Tier
Arris	CM820B	3.0	Up to 343 Mbps
Arris	SB6141	3.0	Up to 343 Mbps
Arris	SB6190	3.0	Up to 686 Mbps
Arris	SB8200	3.1	Up to 2 Gbps
Motorola	MB7621	3.0	Up to 650 Mbps
Motorola	MB8611	3.1	Up to 2.5 Gbps
Netgear	C3700	3.0	Up to 340 Mbps
Netgear	CM600	3.0	Up to 960 Mbps
Technicolor	TC4400	3.1	Up to 2.5 Gbps
Technicolor	XB7	3.1	Up to 2.5 Gbps