How can the copper wires in the communication cables be worked out?
If it's only for copper, throw the thread inside the fire and burn it.Note: now the communication cable (optical fiber cable) is not copper wire inside, and can not be destroyed, this is illegal.
If it is too long, you can cut the cable into a shorter one, then cut the outer black skin in the middle and pull out the leather from both ends so that the inside line is separated from the leather.
If it is shorter, cut the outer leather in the middle and pull out the leather from both ends so that the inside line is separated from the leather.