Straight-Through Cable TIA 568 A/B ======================== The straight-through cable is used to connect  Host to switch or hub  Router to switch or hub Hub/Switch Hub/Switch 1 1 2 2 3 3 6 6 Four wires are used in straight-through cable to connect Ethernet devices. It is relatively simple to create this type; Figure 1.18 shows the four wires used in a straight-through Ethernet cable. FIGURE 1 . 1 8 Straight-through Ethernet cable Notice that only pins 1, 2, 3, and 6 are used. Just connect 1 to 1, 2 to 2, 3 to 3, and 6 to 6, and you�ll be up and networking in no time. However, remember that this would be an Ethernet-only cable and wouldn�t work with Voice, Token Ring, ISDN, etc. Crossover Cable ================ The crossover cable can be used to connect  Switch to switch  Hub to hub  Host to host  Hub to switch  Router direct to host FIGURE 1 . 1 9 Crossover Ethernet cable Hub/Switch Hub/Switch 1 3 2 6 3 1 6 2 Only four wires are used in this cable; just connect different pins together. Figure 1.19 shows how the four wires are used in a crossover Ethernet cable. Notice that instead of connecting 1 to 1, etc., here we connect pins 1 to 3 and 2 to 6 on each side of the cable pair. Rolled Cable ============= host to a router console serial communication (com) port Host Router/Switch 1 8 2 7 3 6 4 5 5 4 6 3 7 2 8 1 Pinout of Cable from Router to Modem: 1 n/c 2 8 3 4 4 3 5 6 6 7 7 1 8 2 Although rolled cable isn�t used to connect any Ethernet connections together, you can use a rolled Ethernet cable to connect a host to a router console serial communication (com) port. If you have a Cisco router or switch, you would use this cable to connect your PC running HyperTerminal to the Cisco hardware. Eight wires are used in this cable to connect serial devices, although not all eight are used to send information, just as in Ethernet networking. Figure 1.20 shows the eight wires used in a rolled cable. FIGURE 1 . 2 0 Rolled Ethernet cable These are probably the easiest cables to make, because you just cut the end off on one side of a straight-through cable and reverse the end. Once you have the correct cable connected from your PC to the Cisco router or switch, you can start HyperTerminal to create a console connection and configure the device. Set the configuration as follows: 1. Open HyperTerminal and enter a name for the connection. It is irrelevant what you name it, but I always just use �Cisco.� Then click OK. LAN LOOP PLUG ========= This is a very useful device and you can make a T1 loopback plug by connecting pin 1 to pin 4 and pin 2 to pin 5 on an RJ-48 plug. -----1 | 2---- -----3 | 6---- T1 CABLE ======== In Genenaral this is just a Straith thru cable, one that you can buy anywhere and is also used as LAN cable. 1 Blue 2 Orange 3 Black 4 Red 5 Green 6 Yellow 7 Brown 8 LT blue T1 LOOP PLUG ========= This is a very useful device and you can make a T1 loopback plug by connecting pin 1 to pin 4 and pin 2 to pin 5 on an RJ-48 plug. CE Rx -----1 PE | 2---- Tx -----4 | 5---- COAX Cable ========== On These cables mainly used for video or DS3 the way to connect is that the TX should go to the RX of the other device. And viceversa. To make a Loop then it will just place one single cable from the TX to RX on the device where the loop will be teminated.