• By Howard - edited: March 7, 2019

    Has anyone here used MoCA (Multimedia over Coax Alliance) gear for their home, or enterprise, backhaul links ?  

    IF  you already had Cable installed in every room, it seems like an appealing solution, and appears to have less chance for interference compared to using power lines (e.g. HomePlug or PowerLINE).   

    Note that it does appear that Charter Spectrum  intentionally rewired my  premise cabling to disable any MoCA devices that I might install myself, by disconnecting every unused cable port.   

    Update -  Charter Spectrum is NOT a member of the MoCA Alliance, at any membership level, which may explain this.  They do support TiVO however. 

    Also, from a security and interference perspective, it seems like every home with cable service should install a MoCA-MPoE (Minimum Point of Entry) Filter on the cable as it comes into your house - whether you use MoCA or not.   

    Note that there are different qualities of these filters with different amounts of insertion loss and band rejection.   Common band rejection values range form 40 to 70 dB.  Typically the more expensive filters are better in both categories.

    For those not familiar with different types of coaxial adapters/connectors, a MoCA Filter is NOT the same thing as a MoCA Splitter.

    PS:   I was surprised to not find ANY Forum posts on MoCA, especially since that standard has been around for a few years.

    I'd like to hear your opinions.

  • By Howard - edited: April 29

    I found an interesting article comparing Power-line and MoCA (pre version 2.0) communications:

    It turns out that some Powerline adapters require 3 connector, as opposed to 2 connector, AC wall sockets.   Lest you think this is just political correctness, and/or a government enforced safety requirement, it is not.   

    What it does do, is allow for MIMO transmissions over your AC circuits to greatly increase the data throughput !  It does this by using multiple pairs of wires (L/N, N/G, or L/G) simultaneously for sending the data. 

    Of course, you need to have correctly wired three-wire AC service throughout your premises, but if you have a home built to newer standards, that should be no problem.   Notice that I stress correctly wired circuits - some have the neutral and ground wires reversed at random wall sockets.

     Alas, and I should have realized it before, but good surge protectors throw a monkey wrench into both 2 and 3 prong Power-line systems, as good protectors will "filter out" the data bits, as power-line noise.  

    The author stated that he would create a new article when MoCA 2.0 was released, but I could not find one.   Sad, since version 2.5 is already available.   He also stated that MoCA is incompatible with Satellite systems, but according to the MoCA site, this is easily remedied with an MPoE filter.

    Speaking of MPoE filters, the Holland model MPOE-TM is advertised as working with all of the newer standards, and costs less than $5.  Previous versions of their filters were not compatible with every MoCA network configuration.

    I visited both Fry's and Best Buy to see what they had in regards to MoCA enabled gear, but was not especially  impressed with the selection.   It appears that most MoCA gear is from Cable companies, and other ISP's, who only sell/provide the gear  to their subscribers.

    Here's a newer Power Line/homeplug article:

  • I had an interesting conversation with a Spectrum repairman yesterday.  My Cable modem had failed because, somewhere up the line, a change had been made that increased the signal levels coming to my house.   The modem couldn't handle the increase, and it killed my network and phone.    He added a new splitter, which (of course) reduced the signal, and that  fixed it right up.   Surprisingly, he said that Spectrum had found that, properly terminated, splitters worked better than dedicated RF attenuators.   I would not have expected that.

    Anyway getting back to MoCA, he said that Spectrum was no longer installing MoCA systems in houses, and that other providers seemed to to be phasing them out too.

    He reminded me that several years ago San Diego had had a severe problem with bad cable wiring that had inferior foil shielding.   The Local airports were picking up TV programs on their RADAR systems.   (I wondered if the Navy was also affected).   He said the authorities (FCC and city) required the cable companies down there to replace many hundreds/thousands of miles of cables because of it.    He said that this might have been some of Spectrum's rationale for dropping MoCA.

    I have been reviewing some  PowerLine technologies for use as backhaul.   Some of the newer technologies, compared to the original versions, look promising.   Some actually use MIMO, over all three pairs of the electrical wiring. 

    I do know that Ham operators have for years complained about interference caused by PowerLine systems.  It will be interesting to see how the new PowerLine affects their radios.

  • By Howard - edited: June 6

    Well, I'm not seeing much interest on this MoCA posting, so I'll probably drop the subject soon.

    In the meantime,  I'll continue here with links to other relative postings that I find.  Because I can edit it without creating new forum entries maybe I'll just do that until someone else gets interested.

    Here's a fairly long thread from arstechnica on MoCA.   The main thing I found here was that some MoCA devices cant handle Multicast -  which might be why I haven't found anything related to enterprise backhaul on MoCA (yet). There is also a fair number of postings regarding TiVO. 

    I don't know why I didn't see this earlier  (maybe because Google has their own competing product ??? see farther down below)

    Here's a performance comparison directly from the MoCA (alliance).  The throughput seems rather high compared to other articles, but what else can we expect from a dedicated test setup, built by the main group behind the technology?

    Here's another one via with a paid-for video from Actiontec. It discusses actual configuration and benchmarks in a gaming network, some with iperf.   Naturally, because MoCA supported the video, the MoCA throughput here is better than wi-Fi mesh.  Some data on Latency comparisons: 

    Specifically a YouTube video on Google Wi-Fi (Mesh), with lots of marketing hype:

    The Wi-Fi Alliance (WFA) database can be searched for MoCA devices, if "MoCA" is in the Product Description field.  It will show up on the certificate copy, even if it doesn't show up in the displayed search results. It is NOT a searchable WFA category.  Other certified devices may also be MoCA certified, but you would have to look at the actual Manufacturers web site.   As of 4/5/19 there are only 7 WFA certified devices that display MoCA.

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