PoE for DOCSIS 3.1 (Xfinity)

[splunge2020]

Ugh, so Xfinity went and started using spectrum above 1GHz in my area. After an upgrade to their equipment, my CM1150V shows the start of the downstream OFDM channel at 955MHz, which means the top is at around 1150MHz I've configured my goCoax to give me 4 channels starting at 1250, so no problem there...the issue is that my PoE filter is now blocking a good chunk of the downstream OFDM. I only have 400Mbps service and still get that, but I do get a blinking downlink light on the cable modem (which indicates "partial service"). I suppose I could try removing the PoE filter and see what happens, but don't think that's viable long term.

Has anyone seen any new PoE filters that work for the newer DOCSIS frequencies? I know @krkaufman has posted a link to a Lindsay Broadband filter (here), but that seems to be a standard 5-1002MHz pass band.

Sure wish they hadn't neutered the spectrum analyzer on my modem

 

[Datalink]

Have a look at the following Lindsay Broadband MoCA POE filters.

https://www.lindsaybb.com/assets/lbmlpf-1.2-ghz.pdf

Don't know why that POE filter has a spec sheet but doesn't show up in the products page.


Other Lindsay Broadband 1.2 Ghz filters, shown as suitable for MoCA ops:

https://lindsaybb.com/wp-content/uploads/2019/10/LBB0129_LowPass_filter_LPF700AS_dsheet.pdf

https://www.lindsaybb.com/assets/low-pass-filter-specification.pdf

Here's the link to the Lindsay Broadband filter page:

1.2 GHz High- & Low-Pass Filters (HPF / LPF) - Lindsay Broadband

A variety of filters are available to suit your needs in bandwidths up to 1.2 GHz. Their compact size delivers large performance with minimal insertion loss, maximum return loss, and […]

lindsaybb.com

 

[splunge2020]

Have a look at the following Lindsay Broadband MoCA POE filters.

https://www.lindsaybb.com/assets/lbmlpf-1.2-ghz.pdf

Don't know why that POE filter has a spec sheet but doesn't show up in the products page.

thanks! How did you ever find that on their site? Now to see if I can actually get my hands on one

 

[CBarbie]

Ugh, so Xfinity went and started using spectrum above 1GHz in my area. After an upgrade to their equipment, my CM1150V shows the start of the downstream OFDM channel at 955MHz, which means the top is at around 1150MHz I've configured my goCoax to give me 4 channels starting at 1250, so no problem there...the issue is that my PoE filter is now blocking a good chunk of the downstream OFDM. I only have 400Mbps service and still get that, but I do get a blinking downlink light on the cable modem (which indicates "partial service"). I suppose I could try removing the PoE filter and see what happens, but don't think that's viable long term.

Has anyone seen any new PoE filters that work for the newer DOCSIS frequencies? I know @krkaufman has posted a link to a Lindsay Broadband filter (here), but that seems to be a standard 5-1002MHz pass band.

Sure wish they hadn't neutered the spectrum analyzer on my modem

When Xfinity installed my setup, they installed their own filter.

 

[ski]

I've configured my goCoax to give me 4 channels starting at 1250, so no problem there.

How?

...the issue is that my PoE filter is now blocking a good chunk of the downstream OFDM....
I suppose I could try removing the PoE filter and see what happens, but don't think that's viable long term.

Agreed. Can you get creative with your PoE placement?

Place the PoE filter after a splitter to the cable modem, feeding the modem with the full Xfinity spectrum feed, then filter just the downstream devices that'll consume MoCA. The only downside to this is that the Xfinity cable TV boxes will never be able to utilize the new DOCSIS spectrum, which will probably never be a noticeable downside to you as a user.

                                   +--+     +----------+
                                   |  +---->|  MoCA.   |
                                   |  |     +----------+
       +--+    +----------+        |  |
       |  +--->| PoE.Fltr +------->|  |
       |  |    +----------+        |  |
       |  |                        |  |     +----------+
------>|  |                        |  +---->|  MoCA.   |
       |  |                        +--+     +----------+
       |  |    +----------+
       |  +--->|  Modem   |
       +--+    +----------+

Xfinity went and started using spectrum above 1GHz in my area.

Does anybody know what Xfinity is planning on doing for their own MoCA clients in the X1 and related families? Is the general gist that internet only customers get 1Ghz+ DOCIS service while TV customers are just expected to be comfortable in the traditional band plan? Clearly many of the X1 services are Linear TV and DOCSIS and MoCA based today.

 

[ski]

When Xfinity installed my setup, they installed their own filter.

Any idea what filter? Here they installed a 70 dB 1125 - 2000 MHz rejection filter; and I'd be in the same trouble as @splunge2020 if/when they kick on 1Ghz+ DOCIS service here.

 

[splunge2020]

How?

I posted this awhile ago.

goCoax MoCA 2.5 adapter

I also tried connecting through MOCA but with a 2ft RG6 and here is what I get: iperf3.exe -P 5 -w 2M -c 172.17.17.19 Connecting to host 172.17.17.19, port 5201 [ 4] local 172.17.17.13 port 62928 connected to 172.17.17.19 port 5201 [ 6] local 172.17.17.13 port 62929 connected to 172.17.17.19...

www.snbforums.com

Agreed. Can you get creative with your PoE placement?

Not really, sadly. Pretty much my only option is to add coax for a dedicated run to the modem, and then run MoCA over the currently existing plant. But since I'm just using the MoCA for backhaul between my two routers, if I were to run cabling, I'd rather just run ethernet to connect the routers and be done with MoCA.