add from past question?

Question

This is a addon from my previous question.
I have a DSL modem and am thinking of buying a switch but from the switch i want to ust the wiring from the phone line w/out the phone signal and makeshift a wire from the wall to the NIC does that still not regognize the signal?

Answer 1

I've no idea why you want to get a switch but i guess you're trying to share your DSL connection with 2 or more computers. Do note the following though..

If you plan to connect DSL modem to switch and computers to switch, that won't work. You'd need a router instead. Reason being the modem's network port is configured to take only 1 IP address (the one PC) and if you have it on a switch, where there's 2 or more PCs, then it just won't work. A router on the other hand, will be able to do NAT (Network Address Translation) and hence give you more than 1 IP address.

If you plan to connect DSL modem to computer, that will take up the NIC on your computer already. Then you'd need another NIC installed in that computer, to connect that to the switch. That, in effect, makes your PC into a router since you'd have to put 2 different IP address on the 2 different NICs.

That brings up the main question..

Telephone line has 4 wires. Network line has 8 wires. Theoretically, only 4 of the 8 wires are really used during data transmission. That means you could technically make your own network cable using telephone line, with one end having 4 wires terminated in a RJ11 jack, and the other end having 4 wires terminated in a RJ45 jack. The trick is figuring out which is which and how to actually terminate those wires on the RJ45 jacks. Take a look at the wiring in the table located at the following link: http://www.zytrax.com/tech/layer_1/cables/tech_lan.htm

As long as both ends' TX+/- coincide with their opposite ends' RX+/-, you'll be fine. Also, bear in mind that your telephone wiring in the wall is most probably wired 'straight'. That might affect the way you terminate the wires at the RJ45 end. Also, where does the telephone wiring behind the wall go? If they terminate at a central punchbox, that will be a problem. What if all the telephone lines are terminated such that they are connected together (in order to facilitate telephone extension wiring)?

Another important thing to note though is that telephone wire is not rated for data transmission, so you will probably face some signal loss. This can result in a crappy network connection in which you tend to keep getting either timeouts or disconnected. Network cable has 6 twists every inch, whereby telephone twisted pair probably has only about 4.5 twists (the twists affect the impedence and therefore the distance which the signal can be carried).

Answer 2

No, you need a modem. The switch can not talk to your isp....