Cisco Cable TV Optical Node and RF Amplifier Teardown
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- Опубліковано 5 лис 2022
- Teardown of Cisco / Atlanta Scientific Cable TV optical node and drop amplifier. These are modern versions running on fiber networks. These small amplifiers are used in houses where it is not practical to use a receiving antenna to get the signal from the broadcast headend transmitter. They are also called a "service drop". Historically CATV is short for Community Antenna TV. A large receiving antenna was used and a cable connection ran out to every house in the neighborhood. Each house had one of these amplifiers. The return path amplifier can also send some of the signal back into the line to keep the signal good enough for the next house. In Denmark, the large receiving antennas has mostly been substituted with fiber connections.
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#electronicscreators #teardown #tv
Cable TV network illustration used with permission according to: commons.wikimedia.org/wiki/Fi... - Наука та технологія
Cool stuff. I love seeing the internals of industrial equipment. The older the better :)
Very nice teardown 🙂
Nice teardown! Always wondered what was going on in the node boxes and such.
I got another box in the work shop, so at least one more Cable TV box teardown video to come in the future :)
Green booted fibre connectors are a little special. The ferrule has an angled polish of 8 degrees, which helps to reduce back reflections. Because of that angled polish you should only ever connect a green boot to another green boot. They are generally known as "APC" connectors.
Blue booted connectors have a flat polish (PC), or perhaps slightly rounded (UPC), and it's generally fine to connect any blue boot to any other blue boot.
But definitely never connect a blue boot to a green boot as the ferrule polishes are incompatible.
Thank you for teaching me something I did not know! :)
Interesting look at these things. I came across some very similar boards on the scrapyard lately. I assumed them to be some kind of TV stuff, now I know.
Interesting to note is that the cable TV guys work with dBuV instead of dBm and therefore in voltage, not power. I just thought this might be an interesting detail and that's also why you don't find any max. power output numbers in the amplifier data sheets.
The casings on these look pretty rectangular on the inside, they might be pretty interesting for some outdoor (radio) projects.
I've been thining of playing with some optical cable internet and tv boxes I find at the garbage. Provly not a very strong emitter though but some interesting components and controllers.
A company selling blank PCBs as replaceable modules makes a good bedfellow for Cisco.
Nice teardown and interesting components.
Where do you get the items for the teardowns?
Privately owned scrap yards :)