Copyright Goodheart-Willcox Co., Inc. 73 Chapter 2 Network Media—Copper-Core Cable Transmit 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Receive Transmit Receive Transmit 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Receive Transmit Receive Straight-Through Crossover Figure 2-26 Wire map of a straight-through cable and a crossover cable. Goodheart-Willcox Publisher Installing an RJ-45 Connector Th e RJ-45 connector contains eight connection points, or pins, inside its plastic housing, as shown in Figure 2-28. To install an RJ-45 connector on a UTP cable, the insulating jacket of the UTP cable is fi rst stripped from the cable, exposing the con- ductor pairs, as demonstrated in Figure 2-29. Th e pairs are untwisted so that each conductor can be inserted into one of the designated pin areas. A crimp tool is used to clamp an RJ-45 connector to the end of the cable, as shown in Figure 2-30. After a connector is inserted into the crimp tool with the wires in their appropriate po- sitions, the handles of the tool are squeezed together. When the RJ-45 connector is crimped, each conductor makes contact with one of the eight pins and the connector is punctured to clamp down onto the cabling jacket. Tech Tip The RJ-45 is also known as the 8P8C connector. The acro- nym 8P8C represents “8 pair 8 contacts.” 2.1, 5.2 NET Uplink port Access port Figure 2-27 A hub typically has many access ports and one uplink port. The circuitry inside the hub provides a crossed connection at each access port and allows for a straight-through connection at the uplink port. Goodheart-Willcox Publisher