The multiplexor could use one of several methods of identifying the recipient of the signals. The first, time division multiplexing, assigned time slots to each of the connected devices. If there were three tape drives connected to the CPU through a multiplexor, then during time slice 1, tape drive 1 would pass its signals through. During time slice 2, tape drive 2 would use the wires, and the multiplexor would electronically connect it to the CPU's port, and so forth. The multiplexor (and the CPU) must be faster than the attached devices in order for no signals to be missed. In the example of Fig. 18.6.1, the multiplexor should be at least three times faster than the disk drives. Another name for this method is round robin because the devices each get their turn in a circular fashion.