by 
The Curious Bag
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If you are still using a land line in your home to connect a telephone or modem, then you are using a cord to connect to the wall jack. The standard phone cord for this type of use is a 2-wire, varying in length.
The Facts
A 2-wire phone cord is used primarily to establish a connection by connecting a telephone to a wall jack.
Types
As far as multi-wire phone cords are concerned, there are 2-wire, 4-wire, 6-wire and 8-wire.
Identification
You can tell a 2-wire phone cord by the standard RJ-11 (Registered Jack) plastic tip connector at either end of the cord. There are two center pins on the tip, as opposed to four for the 4-wire. The same is true for the 6- and 8-wire.
Considerations
A 2-wire cord will only support a telephone with one line. If you are using a home telephone with more than one line, you will need to connect the phone with a 4, 6 or 8 wire, depending on the number of phone lines you have.
Warning
If you use a 2-wire cord on a 2-line telephone set, line 2 of that phone will be completely dead.
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