I have lots of telephone cable and some spare time.
If I strip the outer casing from the phone lines, twist them properly, and add the right connections on the ends will I have usable cat5 cable?
No you will not.
The cables have to have a characteristic impedence not matched with phone grade copper.
In addition, they must have for their entire length (other than the 1/2 inch exposed to make connector connections) a continuous twist of no greater than and no less than one twist per inch.
For short runs you might be able to duplicate Cat-3.
Even for short runs you cannot duplicate Cat-5 with phone grade wire.
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