Copyright Goodheart-Willcox Co., Inc. 74 Networking Fundamentals Plastic housing Pin RJ-45 Connector Figure 2-28 Close-up of an RJ-45 connector. Conductor pair Insulating jacket UTP Cable Figure 2-29 The insulating jacket on this UTP cable has been stripped to reveal the conductor pairs. Goodheart-Willcox Publisher Rollover Cable A rollover cable is a special cable in which the pin order is completely reversed on one end of the cable. Pin 1 connects to pin 8, pin 2 connects to pin 7, and so on. Th e Cisco console cable is wired like a rollover cable in that the pin numbers are reversed. However, a Cisco console cable uses an RJ-45 connector on one end and a DB-9 serial connector on the other, whereas, a rollover cable uses an RJ-45 connector on each end. Bonding and Grounding STP and coaxial cable requires equipment to be bonded and grounded before the shielding can be eff ective. All electrical systems have one centralized ground that is common for all electrical equipment. Th e centralized ground is typically located at the point in the building where the electrical company commercial power enters. Th e ground path must be continuous from the equipment to which the cable is attached to the central ground in the electrical system. If the ground path is not continuous, the shielding will not eff ectively protect the network cables from elec- trical and radio interference. Th ere will be more about grounding and bonding in Chapter 18. Figure 2-30 An RJ-45 crimp tool is used to make the connection between the RJ-45 pins and the twisted-pair conductors. Goodheart-Willcox Publisher Goodheart-Willcox Publisher