Panasonic 50gx800b killing my internet for other devices

xar

Hi all,

Trying this in a different forum as not getting much action in the TV one (and this is one is probably more appropriate):

Just got a Panasonic 50gx800b. Having a very odd problem with the wired connection whereby it stops other devices connected to the same gigabit switcher from working. Situation is a follows:

- was originally connected to a Devolo powerline adapter and internet worked fine on the TV, but the Devolo is capped at 500mbps and I wanted to make better use of my 330mbps fibre connection
- I have a cable running directly from my router to my iMac in the next room, so I bought a gigabit switcher, drilled a hole, ran a cat5 from the panny into the next room, plugged both the iMac and the panny into the new switcher
- iMac works fine when the TV is off, but as soon as the TV is on the iMac cant get a connection (no internet message), but the TV works fine
- I have tried other devices besides the iMac on the same switcher but getting exact same problem

As soon as I remove the TV from switch all other devices work fine again.

Note that I have the exact same setup in my living room into a LG C8 (gigabit switch, multiple devices etc) and it works flawlessly, so not sure what is going on

I have put the panny back into the devolo and it works fine for now, but I really want to figure out what is going on.

Any ideas? i.e. why would the Panny be killing the internet for other devices? I have tried a few settings on the Panny but nothing obvious jumping out at me

ArcticWolf710

I had a similar situation with a Panny EX750 completely screwing my WiFi connection (interference).  My WiFi was constantly switching from perfectly fine to  dropping to an absolute crawl.  It took many hours of trial & error to catch it, & eventually the interference became bad enough that it could be audibly heard.  Obviously slightly different to your wired situation but if it helps.....

In my case it was either the TV Anywhere or Control 4 options (pretty sure it was the former) in the TV's network settings.  It was well over a year ago & both have been disabled since.  Disabled & instantly problem solved & no issues since.

If you're lucky it'll be something that simple.  Hope you track down the cause .

xar

Thanks. Will give it a try! Very frustrating

ChuckMountain

Did you make the cable yourself or buy a pre-made one.

Are any other devices in the house affected by it or just the ones on that particular switch?  Assume you have tried different ports etc.

The other thing is with the Homeplug you will be lucky to get a throughput of around 50Mbps on those.  The advertised speed is always duplex i.e. max would be 250 anyway and normally it is nowhere close.

Also your TV will be probably limited to a 100Mbps connection anyway.

xar

Purchased. I tried several cables, several ports, even tried my other switch from the other room. Makes no difference.

Agreed on the speeds, was just trying to remove the power line from the equation as it can be flaky.

mickevh

For the avoidance of doubt; all data networking devices have a "duplex" mode.
"Full Duplex" == can transmit and receive at the same time. (e.g. most modern, but by no means all, ethernet, ADSL, VDSL.)
"Half Duplex" == can transmit or receive, but not both at the same time. (e.g. Wi-Fi, HomePlugs.)

Anyway; how does the TV get an IP address..? For example, if it's manually assign and (say) the same as you router for example, it'll kill the network whenever you pug it in - or at least internet access. Best to use DHCP and let the automation take care of IP adressing.

What is the make/model of your switch..? If it's some cheap nasty port replicator and not a "proper" switch, it could suffer if you connect up 10/100 and gigabit devices at the same time.

If you connect the TV to the switch, and physically disconnect everything else, does it work then?

If the TV has Wi-F - inc things like Wi-Fi direct, turn off if you don't need it.

ChuckMountain

You don't have a managed switch anywhere do you?

xar

Hi both - the TV works fine when its connected to the switch, but nothing else connected the same switch will. Let me check the IP address bit. I don;t have a managed switch anywhere.

I may just leave it on the devolo as it seems to work fine enough, its just bugging me is all!

The switch is the netgear one below - cheapy one but I have it in 2 other rooms and it works flawlessly:

                                                https://www.amazon.co.uk/NETGEAR-Ethernet-Unmanaged-Internet-Splitter/dp/B07PWHGQSS/ref=pd_lpo_sbs_147_t_0?_encoding=UTF8&psc=1&refRID=9XRKZ48CMGYMFYNHMCYA               

mickevh

Cool - shouldn't be any issue with the switch - NetGear have been in the business for ages and have a reasonable reputation.

I note it has some indicators on the ports. It would be interesting to watch them as you plug in your devices and see what happens to them.  For example, if you have devices in ports 1 & 2 (no particular reason, I choose numbers at random) do their indicator lamps go out when you connect the TV...? If not, can you provoke any activity on the ports - for example, ping something from iMac and see if the port lights flash (usually that indicates activity.) If so, probably not an issue with the switch.

I note the switch is a so called "green" switch (which does things like power down inactive ports.)  I've never used one, but there are some stories circulating about green switches doing wacky things some times, but we can get into that depending on the test results from lamp monitoring.

Do you have anything else in hand that could be used to (temporarily) replace the switch by way of a test. Old router for example and IIRC you mentioned you had another switch elsewhere.

xar

Thanks for the info. I do get lights working on the other ports with the tv plugged in, but no connection. I don’t think it’s a sleep mode as I have 2 others in the house and they don’t have that issue. I have tried one of the other 2 switches and same issue.

Will to look into the WiFi and remote suggestions from earlier posts first.