Connectors and Cables

This appendix provides connector and cable pinout information for the 100BaseTX and console ports on the FastHub.

100BaseTX Ports

The 100BaseTX ports use standard RJ-45 connectors, as shown in Figure B-1. The pinouts are listed in Table B-1.

Figure B-1: 100BaseTX Port Connector

Ports 1x through 16x have their transmit (TD) and receive (RD) pairs internally crossed. When connecting these ports to another hub, switch, or router (unless you are connecting to the uplink port on another FastHub or 100BaseT hub), ensure that you use a crossover cable.

Port 16, which is to the right of port 16x, is the 100BaseTX uplink port. This uplink port is not internally crossed. When connecting this port to another FastHub 100BaseTX port or to the 100BaseTX port on another hub, switch, or router, ensure that you use a straight-through cable. Remember that the port on the device to which you are connecting must be an X port.

Straight-through and crossover cable schematics are shown in Figure B-2.

Figure B-2: Straight-Through and Crossover Cable Schematics

Console Port

The supplied RJ-45-to-RJ-45 rollover cable and adapters are used to connect the console port of the FastHub to a terminal or modem. The following sections describe the rollover cable and adapters for the console port.

Identifying a Rollover Cable

You can identify a rollover cable by comparing the two modular ends of the cable. When holding the cables side-by-side, with the tab at the back, the wire connected to the pin on the outside of the left plug should be the same color as the wire connected to the pin on the outside of the right plug (see Figure B-3). If your cable came from Cisco Systems, pin 1 is white on one connector, and pin 8 is white on the other (a rollover cable reverses pins 1 and 8, 2 and 7, 3 and 6, and 4 and 5).

Figure B-3: Identifying a Rollover Cable

Connecting to a PC

Use the thin, flat, RJ-45-to-RJ-45 rollover cable and RJ-45-to-DB-9 female DTE adapter (labeled "TERMINAL") to connect the console port to a PC running terminal emulation software. Figure B-4 shows how to connect the console port to a PC. Table B-2 lists the pinouts for the console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-9 female DTE adapter (labeled "TERMINAL").

Figure B-4: Connecting the Console Port to a PC

Connecting to a Terminal

Use the thin, flat, RJ-45-to-RJ-45 rollover cable and RJ-45-to-DB-25 female DTE adapter (labeled "TERMINAL") to connect the console port to a terminal. Figure B-5 shows how to connect the console port to a terminal. Table B-3 lists the pinouts for the console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-25 female DTE adapter (labeled "TERMINAL").

Figure B-5: Connecting the Console Port to a Terminal

Connecting to a Modem

Use the thin, flat, RJ-45-to-RJ-45 rollover cable and RJ-45-to-DB-25 male DCE adapter (labeled "MODEM") to connect the console port to a modem. Figure B-6 shows how to connect the console port to a modem. Table B-4 lists the pinouts for the console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-25 male DCE adapter (labeled "MODEM").

Figure B-6: Connecting the Console Port to a Modem