Spectrum Gig MOCA issue

[krkaufman]

It all depends on the roll-off. If it starts at 700 Mhz and rolls off significantly from there, then yup, its no good. But, if the end figure is the roll-off at or around 1218 Mhz, then it should be usable. It all depends on that loss figure above 700 Mhz and what that is intended to indicate. One would really need to see an ingress loss plot to determine whether or not its suitable. The company claims that its suitable for MoCA ops, so the implication is that the roll-off doesn't occur until much higher in the frequency range. If someone had one of these on hand and the ability to check the signal levels on their modem, it would be easy enough to determine, is the filter performance acceptable or not? Its unfortunate that the spec sheet doesn't present better guidance as to where that upper roll-off begins, and at the present time, I'm not assuming that it starts right at 700 Mhz.

If the specs say the min loss for the 770-1218 MHz range is 46 dB, then the min loss at 770 MHz is 46 dB.

(I was about to edit my post to correct the 700 to 770.)

 

[Datalink]

Absolutely agree with what it says .... but, it makes no sense. Why would you design a 1.2 Ghz low pass filter, call it usable for MoCA ops, and cut the performance off at 770 Mhz and above, when ISPs are moving up beyond 1 Ghz for DOCSIS ops? How the filter is designed and intended to be used, and the description of it, might be worlds apart, personal opinion.


Fwiw, I haven't seen any other MoCA filter that runs from 5 to 1218 Mhz. You would think by now that a filter such as this would exist. Interpretation from this ... if you happen to have an ISP that uses frequencies up to 1218 Mhz, and you are running a MoCA network .... in the absence of a usable filter, where you want to obtain the highest data rate possible, you have no other choice but to have a completely separate cable run from the demarc to the modem. Your internal cabling would support an internal MoCA network.

 

[krkaufman]

How the filter is designed and intended to be used, and the description of it, might be worlds apart, personal opinion.

Concur. The thought “where would this even be used?” passed through my mind.

you have no other choice but to have a completely separate cable run from the demarc to the modem.

Yep. And possibly forcing modem relocation to the demarc to effect the separation.

edit: p.s. Frontier’s FCA252 adapter opens up some possibilities worth exploring, with configurable operating frequencies of:

1GW: (1475-1675 MHz); 2x 100 MHz​

25GW: (400-900 MHz); 5x 100 MHz​

LAN: (1125-1675 MHz); 5x 100 MHz​

Example:

 

[Grandpalecea]

Operating the MoCA 2.5 adapters at D-High (1350-1675 MHz) would possibly give you 3 bonded channels, so 1200 Mbps shared max. (So at least moving beyond the 800 Mbps bottleneck discussed in the OP.)

As stated previously, if your provider is really beginning to use expanded DOCSIS 3.1 frequencies above 1002 MHz, the best plan, if at all possible, is getting the DOCSIS feed isolated from the MoCA coax. And if they’re not and the D3.1 modem is just getting flaky with MoCA signals hitting its circuitry, a MoCA filter installed directly on the modem’s coax port is a good workaround until you can get the modem feed isolated (and ready for DOCSIS 3.1+), allowing you to operate the MoCA adapters at full capacity.

 

[Grandpalecea]

View attachment 42415

Could you please recommend POE, SPLITTER, MOCA Adapter to use? Would this work with a Spectrum DOCSIS 3.1 Modem with an upper frequency of 1708 MHz? Thanks!!

 

[degrub]

MOCA does not work if the DOCCIS modem is using frequency bands up to 1708 MHz as that fully covers the MOCA operating bands. Your only choice, if you want to use MOCA, is to isolate the cable feed from the ISP to the DOCCIS modem from the coax using MOCA. May be as simple as a new run from the ISP demarc to the modem location.