Wall jack to cable modem

Patrick_175 · Jul 14, 2017

I am trying to wire a cable modem to a wall Jack and connect a computer to the wall Jack using cat5e cable. The cable coming out of the modem is RJ45 at one end a jack at the other end. The RJ45 is wired orange/white, orange, green/white, blue, blue/white green, brown/white, brown. The jack is wired using t568b. The cable running from the computer to the jack is straight through. I have no internet connection on the PC. Please assist.

kanewolf · Jul 14, 2017

Start by verifying the jumper cables are good. Use each one to directly connect to the modem. If they are both good then your problem is the in-wall cabling. It may be that the cable doesn't go where you think it goes (point to point). Maybe there is a common point that you will have to add a switch or jumper. No way to know what the problem is.

Patrick_175 · Jul 14, 2017

kanewolf :

It's a cable that I just ran in a new house. The straight through from the wall to the PC works because I plugged it into the computer into the Comcast modem directly to test. The cable running through the basement to the wall jack is brand new off the spool

kanewolf · Jul 14, 2017

Since the PC is not happy with the connection, did you purchase a simple tester when you purchased the rest of your cabling supplies?

Patrick_175 · Jul 14, 2017

kanewolf :

No. Unfortunately it wasn't in the budget.

USAFRet · Jul 14, 2017

Patrick_175 :

$8 ?
https://www.amazon.com/Generic-sfg-Network-Tester-Telephone/dp/B00G55ZGZ8

DookieDraws · Jul 14, 2017

Unless I am confused at what you have posted, you are doing it wrong. You MUST connect the cable modem to the wall with the coaxial cable, and with an Ethernet cable, connect your computer to the back of the cable modem.

USAFRet · Jul 14, 2017

DookieDraws :

Exactly correct.
A cable modem accepts a coax in, and then outputs ethernet via the RJ-45.

Patrick_175 · Jul 14, 2017

USAFRet :

So I went out to the store and got a tester. Both cables tested good. The computer that I was using to test the connection was one that I hadn't hooked up in a while. Last time it was hooked up, the Ethernet port was working. The Ethernet port on the pc is currently not working (maybe a driver issue) which I will figure out later. A different pc connected normally. Thanks for the help.

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