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What's inside a Cisco Catalyst 9120 wireless access point?

AintBigAintClever

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Intermediate. Assumes working knowledge.

3.4K views3 years ago1 recommendation

HardwareSystems programmingNetworking and protocolsEmbedded systems

A teardown and repair of a water-damaged Cisco Catalyst 9120 wireless access point, showing its internal RF and processor boards.

Not just any old WiFi 6 access point, this one's had something special inside... water. Let's pop the lid off this freshly-drained access point and see if we can resuscitate it. INDEX Index Introduction: a Cisco Catalyst 9120 wireless access point It got wet What's inside? Antenna board Main circuit board & RF ASIC board Found a fault Confirming the faulty component But what exactly caused it to fail? Soldering my first DFN package Will it boot? Signs of life, but it's not happy Another fault found and fixed Ethernet port activated Conclusions, so far... No 60GHz capacitors were harmed in the making of this video. Or found, for that matter.

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What people say. Recommended as a detailed look at the internal hardware design and components of a commercial Wi-Fi access point.

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u/WendoNZin r/embedded • Recommends

On “what do real wifi access points use internally?”

…ey have the resources to get their RF certified and you do not. Even the unlicensed bands have strict limits on power, channel use etc and they differ by country. Typically AP's have multiple radio chips and a ARM based processor, RAM and flash. Sometimes a separate ethernet chip. This gives you a decent idea of what a recent Cisoc AP looks like link to this video If you're asking can you make your own from the same components the answer is no, not if you have to ask how painful the RF side is. Looking at that Cisco PCB should make it obvious this isn't even something that "looks" easy It's also why no one in the hobby world "adds" wifi to their project manually, they get a chip that has it integra…
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