Try a piece.
I would use a chop saw to but a length say 6"
Look at the middle to see if there is hemp in it not all steel
If rope in center take it appart and discard the rope.
If you want more material in the bundle than the cable provides and have an arc welder take the cable apart into the makor bundles of wires. make a bundle of several of these till you have enough material. they will not go together like a calbe and look strange in the bundle but will lay next to each other. Wrap this bundle with a strand or two of tire wire. arc the ends together and I weld a handle on one end to make it easier to go from the fire to the hammer or anvil.
Bring to an orange heat this will burn off the grease, flux with your farorite vodo powder and bring to forge welding temp.
I weld mine in a bottom swage under a hammer into a round solid then twist this round either left or right depending on what pattern I am looking for then forge into the knife blank or square up to forge weld with other pieces similarly done.
If you do left/right/left twists ect you get herring bone cable
you dont have to weld the whole piece of cable at once just the part hot enough then back into the fire further in continue welding till all is done.