Cisco CCNP Certifications Exam 642-892

There are physical limits 642-642 to how far serial data communication can occur over a piece of wire. When you apply a voltage onto a wire it takes time for that voltage to traverse the wire, and there are other unstable conditions that happen when you send a "pulse" down the wire and change voltages too quickly. This problem is worse as wires become longer and the frequency (i.e. baud rate) increases. This distance can vary based on a number 642-825 of factor, including the thickness of the wires involved, RF interference on the wires, quality of the wires during the manufacturing process, how well they were installed... e.g., are there any "kinks" in the wires that force it into a sharp bend, and finally the baud rate that you are transmitting the data.

This table presumes a 642-892 fairly straight and uniform cable that is typical for most low-voltage applications (i.e., not a power circuit that uses 110V to run your refrigerator, toaster, and television). Typically something like a CAT-5 cable (also used for local networks or phone lines) should be more than sufficient for this purpose.