I have a Ethernet cable that has approx speed of 250 Mbps but then I dont get enough range in one of the rooms, so I was thinking of splitting the main Ethernet into two cables and then sending one of that to a different room which has a router which transmits in pretty good speed. But I'm not sure how to split the cable into two. I've heard about network switches, but it shows something like 5-Port 10/100MBPS with the product title, which I assume 100 Mbps is the max speed? I'm not sure, can someone throw some light on it, because I want more than 100 Mbps to be transmitted from the wires. And will it work if one Ethernet cable be split into two where the two cables can be plugged into two different routers?

The arrangement might sound stupid, but there are other reasons behind it. The whole network concept just terrifies me.

Sorry, if this is not the right place for this question. Thanks in advance :D

Current setup: Network from my neighbours moden is bough to my routers LAN cable which makes wifi system here, but its pretty slow(might be a modem issue), connecting to a different modem fixes the network speed, but the new modem has less range, so I was planning to use 2 modems but with only one ethernet cable. Hence my idea to split the cable into two and give two ethernet to two modem.

  • Are you sure you need more than 100 Mbps of bandwidth? What are you going to use this for? For most users that's more than enough unless you want to split this bandwidth further.
    – gronostaj
    Nov 18 '20 at 10:56
  • @gronostaj Pardon me if im wrong, bandwidth and network speed are same? Like will this 100 effect my network speed? Will I be getting the same network speed transmitted by the first Ethernet cable?
    – Cool Cloud
    Nov 18 '20 at 11:05
  • Yeah, mostly. Bandwidth = max theoretical data transfer rate in this context.
    – gronostaj
    Nov 18 '20 at 11:08
  • If networking is not your forte, maybe you could describe what you want to achieve and what your current setup looks like and we could work from there. (edit the question)
    – gronostaj
    Nov 18 '20 at 11:09
  • @gronostaj To be honest I need a 250 mbps network speed, I do some heavy downloads :(
    – Cool Cloud
    Nov 18 '20 at 12:00

Your question is very unclear, so I'll try address multiple interpretations.

It is possible to split a single physical Ethernet cable into 2 cables, but you will limit the speeds to 100 megabit, as you only have 2 pairs (ie 4 wires) per cable. The big limitation is that the cable needs to GI between the same points and you need 2 ports in your router. Unlike phone cable you can't connect 3 cables together to connect up 3 devices. (Although this is what your question asks, I don't think this us what you want to do)

The other alternative - which is not splitting cables but rather daisy chaining switches - is likely what you want. Yes, 100 megabit switches will be limited to 100 megabits, but you can pay more money and get gigabit ones. Its fine to connect multiple switches together, provided you don't create a loop. Is each switch should only connect to 1 other switch. If you need 2 virtual cables - rg for LAN and WAN this is much harder and more expensive as you need VLAN capable switches which are a lot more expensive.

As an aside, have you looked at Ethernet over power devices and mesh networking - these might offer you practical alternatives.

  • What I meant by 100 megabit was that, would the network speed be limited to 100 mpbs?
    – Cool Cloud
    Nov 18 '20 at 11:11
  • 2
    @CoolCloud Yes, it would. Be careful with capitalization in units, 1 B = 8 b (B = byte, b = bit), so 1 MB/s = 8 Mbps. Most software will measure download speed in MB/s, but for network speed Mbps is used.
    – gronostaj
    Nov 18 '20 at 11:17
  • Omg, thanks for this, Ive been making mistake the whole time :( So what i meant is 250 mbps, and the one in the router is 100 MBPS, which means 800 mbps, is all I will ever need. Thanks I get it :D
    – Cool Cloud
    Nov 18 '20 at 11:25
  • So in simple words, all i need to do is use a ethernet switch and connect the two ethernet from the switch to 2 different modem right?
    – Cool Cloud
    Nov 18 '20 at 11:27
  • @CoolCloud There's no mbps or MBPS. Either Mbps (used on networking equipment and for Internet speed) or MB/s (used for download/upload speed). Networking equipment works at 10 Mbps (ancient), 100 Mbps (old but okay-ish), 1000 Mbps = 1 Gbps (modern) and a few faster but still uncommon standards. To fully enjoy your 250 Mbps Internet connection you need 1000 Mbps equipment. Please consider describing your current setup and your goal in a new question, this could save you some mistakes, time and money.
    – gronostaj
    Nov 18 '20 at 11:35

You'll need a 1000 Mbps switch (or 1 Gbps, same thing). The cable goes into one port, two other cables go out of any other ports.

But if you're actually going to connect two routers to this switch, you'll run into another issue: devices connected to two different routers won't see each other. So for example local network file sharing will not work, it will all go through the Internet. That's because each router creates a separate network.

What would work is connecting a single router where you wanted to split the cable and adding additional access point where you need better WiFi coverage and/or speed. Access points don't create a network, they simply broadcast the wireless signal for the network created by the router, so you're avoiding the two networks issue.

Alternatively, consider using the router with good speed but poor range + a good WiFi repeater. That's probably the cheapest and easiest solution, but YMMV, the repeater may have speed issues too.

The best, most reliable option would be to use wired connection. If that's not an option due to difficulties laying the new cable, you could add powerline adapters into the mix - these transmit network signal over regular AC cables you already have in your walls. Make sure to get ones that will be fast enough for your application (300 Mbps+, some headroom is always nice to have).

  • Oh I understand what things much clear, Thanks mate
    – Cool Cloud
    Nov 18 '20 at 12:52

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