Fiber_Nexus: Hybrid Fiber Coax

  • Posted on 2015-07-17 11:49:52
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Welcome,


Today's blog will be about HFC (Hybrid Fiber Coax). I have 6 years of experience in HFC troubleshooting and installation and one thing I can say is that it is very interesting! HFC is the combination of a Fiber and Coax network that some ISPs like Time Warner, Comcast, Charter, Cox, etc use. It is very interesting because it has a lot of different types of equipment used to provide TV, Internet, and Voice services. The way it is designed is by having most of the networking and transport equipment at a local Headend. It is like the "brains" of the network. There it will receive TV content via satellite dishes or via IP streaming. The networking routers and CMTS would be located there to provide the WAN internet connection and the PSTNs would be there for the voice services. The modulators and demodulators are there to encode TV RF (Radio Frequency) signal throughout the entire HFC network. From the Headend, it will travel and connect to a Node via fiber cables. The node is located in the field to convert it from fiber to coax, hence the word HFC, and the coax trunk cables that are running across the poles or underground go through amplifiers to amplify the signal until it reaches a tap. The tap is the connection at the pole or at an underground pedestal by your home. Remember back when people would steal cable and they had a guy do it for them on the side? Well they would connect the RG6 cable to the tap where it grabs the RF signal. Once the cable reaches the inside of your home, the signal would be split through a device called a RF Splitter and the cable would connect directly to your cable modem or cable box. The biggest issue with cable is weather. The heat, cold, cracks, kinks, bends, or connector suck-outs would cause intermittent internet issues and tiling on your TV signal. My best advice is always make sure your coax cabling is no more than 6 years old. It can definitely last longer but if you move in to a home older than 6 years, its better to replace it and be sure your wiring is up to date. Also, the best cable to use for the inside of your home is RG6! Always replace RG59 cabling. That type of cable is very old and definitely not strong enough to carry the amount of RF signal and bandwidth nowadays. Today I wanted to post something different. I wanted to take a break from networking because it can get frustrating sometimes when you are studying a lot, but next blog I will come back to talk about another routing protocol whether its EIGRP or BGP. I still haven't had someone request an explanation for a particular topic or routing protocols so I will just post whatever comes to mind. You guys can always ask me anything even lab examples! I enjoy doing this. Anyways, I hope you learned something today and if you have any questions let me know! Here is a really good and simple picture that Wikipedia posted regarding HFC.













1 /1 Comments
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@ShepherdMaliLuv

@fiber_nexus Very good post! Thanks for sharing.
Commented On : 2015-07-17 16:10:25

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@fiber_nexus