DSL Ethernet and Phone Line Splitters and Modems

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bws678

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Oct 5, 2013
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Is there a way to run an Ethernet cable from the DSL splitter at the NID and have it go directly to a router? To me this doesn't seem possible because the modem has communication to make with Frontier that the router would be incapable of making on its own. Right now it is just RJ11, which obviously doesn't allow for a direct connection to the router. I have found a few forums stating that you can do a splitter OR use a modem because the real problem is RJ11's poor quality which is eliminated when running Ethernet from the Splitter. The reason for this question is because I am going to run new Ethernet from a splitter to a room where there is already RJ11. I would like to avoid buying a new modem that can do more than my current one (1.1mbps). If it's possible, I'd like to just connect the router to the new Ethernet jack. Please correct me if I'm wrong. This is all new to me and advice is appreciated.
 
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Nerumph
You seem to misunderstand the function of a modem. The traffic from your phoneline in is modulated via analog standards, while Ethernet is a digital, packet-based standard. The modem makes this transformation, while also playing the key role of authenticating network traffic to ensure you have a valid subscription with Frontier. By giving them your modem's MAC address and/or HWID, you are put on a sort of "approved list" within the wider network backbone that your ISP provides.

You can think of it as giving your friend your wi-fi password. In this way, you are authorizing that user to utilize your "network backbone" just as Frontier is authorizing you to use theirs. Just as "shady neighbor #1" cannot gain access to your infrastructure...
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Nerumph

Nerumph

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Apr 15, 2014
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You seem to misunderstand the function of a modem. The traffic from your phoneline in is modulated via analog standards, while Ethernet is a digital, packet-based standard. The modem makes this transformation, while also playing the key role of authenticating network traffic to ensure you have a valid subscription with Frontier. By giving them your modem's MAC address and/or HWID, you are put on a sort of "approved list" within the wider network backbone that your ISP provides.

You can think of it as giving your friend your wi-fi password. In this way, you are authorizing that user to utilize your "network backbone" just as Frontier is authorizing you to use theirs. Just as "shady neighbor #1" cannot gain access to your infrastructure without your password, "kiddy hacker #1" cannot just hook up their modem into the network and get free internet forever without being approved by Frontier.

So in short, no, you will need to get a new modem if you want to connect any new service between J11/J45 connections.
 
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bws678

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Oct 5, 2013
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Can I simply connect an RJ11 jack to the end of an Cat5e cable to attach to the modem, or do I need a converter of some kind? Would this type of thing be impossible to do with Cat5e when connecting to a modem?
 
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Nerumph

Nerumph

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Technically, you can use a cat cable for the analog phoneline signal.
https://www.dslreports.com/forum/r28569186-Use-of-CAT-5-cable-for-telephone

You basically would connect the lines you need in the order specified in the link above, then leave the others out of the connector. It would be pretty messy in terms of aesthetics, but it would be a ok enough to transfer the analog signals to your modem.

I do just want to re-emphasize that the signal coming into your home via your phone line is an Analog signal, while your cat5 running in your internal LAN network is a digital signal. You won't be able to just wire a J11 connector on one end and a J45 on another and expect to get internet.
 
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