Specifications

Input/Output Controller Replacement Instructions 43
I/O Controller Connection Equipment and Port Signaling
Figure 28 Crossover Cable Pinout, I/O Controller RJ-45 Connection to an End Station or
DTE
To identify the RJ-45 cable type, hold the two ends of the cable next to each other so you can see the
colored wires inside the ends, as shown in Figure 29.
Figure 29 RJ-45 Cable Identification
Examine the sequence of colored wires to determine the type of RJ-45 cable, as follows:
• Straight-through—The colored wires are in the same sequence at both ends of the cable.
• Crossover—The first (far left) colored wire at one end of the cable is the third colored wire at the
other end of the cable.
Console and Auxiliary Port Connection Equipment
The I/O controller has two EIA/TIA-232 ports: a DCE-mode console port and a DTE-mode auxiliary
port. The console port is a DCE DB-25 receptacle for connecting a data terminal. The auxiliary port
is a DTE DB-25 plug for connecting a modem or other DCE device (such as a CSU/DSU or other
router) to your router. (See Figure 30.)
Note Both the console and auxiliary ports are asynchronous serial ports; any devices connected to
these ports must be capable of asynchronous transmission. (Asynchronous is the most common type
of serial device; for example, most modems are asynchronous devices.)
Before connecting a terminal to the console port, configure the terminal to match the router console
port as follows: 9600 baud, 8 data bits, no parity, 2 stop bits (9600 8N2). You need an EIA/TIA-232
DCE console cable to connect the terminal to the console port. After you establish normal router
operation, you can disconnect the terminal.
Ethernet port
3 TxD+
6 TxD–
1 RxD+
2 RxD–
3 TxD+
6 TxD–
1 RxD+
2 RxD– H10417
Hub
H5663