3Com Router 3012, Руководство по установке

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26 C
HAPTER
3: I
NSTALLING THE
R
OUTER
To configure the router through the console terminal:
1 Turn off power to the router.
2 Select a console terminal — The console port can be either a standard ASCII
terminal with an RS-232 serial interface, or a PC.
3 Connect the cable — Turn the power switch off, and then connect the RS-232
serial interface of the console cable to the console port of the router.
After the connection and verification, power on the router. The startup
information of the router is displayed on the console terminal.
Connecting the Router
to the Ethernet
The Router 3000 series routers provide a fixed 10/100BASE-TX fast Ethernet
interface that uses category-5 twisted pair cable, as shown in Figure 5
Figure 5 Ethernet Cable Assembly
The Ethernet cables are classified as straight-through network cable and crossover
network cable. They have the following features:
■
Straight-through network cable — The sequences of the wires crimped at the
RJ-45 connectors of the two ends are the same. The cable is used in the
connection between a terminal device, such as a PC or a router, and the Hub or
LAN Switch. Straight-through network cables are delivered along with the
router.
■
Crossover network cable — The sequences of the wires crimped at the RJ-45
connectors of the two ends are different. The cable is used in the connection
between the terminal device, such as a PC or a router, and another terminal
device. You can create this cable yourself, if necessary.
For the pinouts, identification and making of the two network cables, see
Appendix A. Take the following considerations into account before you connect:
■
The fixed Ethernet cables are included in the standard configuration of the
router.
■
Use shielded cables to ensure electromagnetic compatibility.
■
Identify the mark on the module port so you can plug the cable in correctly.
■
When connecting the Ethernet cable to a LAN Switch, plug the cable into the
10/100BASE-T interface marked with MDIX.
To connect the Ethernet cable:
1 Turn off power to the router.
2 Select the Ethernet cable.
When connecting the router with a PC or a router, use the crossover network
cable.