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Can I connect a modem/router to a cable modem ?

February 7, 2012 at 13:41:58
Specs: Windows Vista

I have a cable modem installed to my property but want to use my modem/router to go wireless. The proble is my cable modem output is a RJ45 and the router input is RJ11. Can anyone help please ?

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#1
February 7, 2012 at 13:51:15

Wireless Cable Router would make life easier...

Googling is quicker than waiting for an answer....


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#2
February 7, 2012 at 14:20:10

Given your situation your only option is to replace the existing modem with your modem router.

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#3
February 7, 2012 at 17:05:22

The problem is my service provider supplied me with their cable modem which connects with a coax cable. My modem/router connects with a RJ11. How do I overcome this ?

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Related Solutions

#4
February 8, 2012 at 01:35:08

It would help if you told us the make and model of your modem/router. It is quite possible with some to connect an RJ45 cable from the cable modem to one of the RJ45 jacks on the modem/router (I'm presuming it has the normal 4 ethernet ports). But you will probably need to do some configuration to use it just as a wireless access point.

Here's a link that details the general procedure: http://www.speedguide.net/articles/...


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#5
February 8, 2012 at 05:19:26

basically, the two bits of hardware you have are not compatible. The cable modem provides an ethernet output. The modem/router you have is ADSL and as you rightly say, is meant to connect to a telephone line. Sell it on ebay and buy yourself a new router that has Ethernet connection on the WAN side.

Goin' Fishin' (Some day)


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#6
February 8, 2012 at 08:03:27

@Richard59 Although a modem/router has a telephone line input it also (normally) has 4 ethernet ports. You can connect any ethernet device to it, and that includes a cable modem. No reason why you shouldn't use it (with appropriate configuration) as a switch/wireless access point. Many people use spare modem routers like that.

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#7
February 8, 2012 at 09:01:30

That is assuming the modem is supplying more than one ip address which is not normally the case.

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#8
February 8, 2012 at 10:54:48

The modem/router can use that address and then provide NAT services for other devices. You are just using it as a router and ignoring the modem part.

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#9
February 9, 2012 at 01:23:08

I may be wrong here but to use the router function of the device it requires a WAN connection which would in this device be hardwired through the adsl modem.
The device would not be able to provide DHCP or NAT service via a LAN side connection from the cable modem. You would only be able to use the Switch functions of the device and therefore only one client device at a time would get an internet connection.
I stand by my initial advice to hock the ADSL device and buy an appropriate router with ethernet WAN port.

Goin' Fishin' (Some day)


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#10
February 9, 2012 at 02:22:51

It all depends upon the make and model. Some will allow you to use one of the ethernet ports as a WAN port so that you can use them in conjunction with cable or fibre. Look, for example, at the Netgear N600.

Hence my question to the OP - what make and model is the router.


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