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Now that the NIC is installed in the system, it is time to configure it.

Configuring the NIC


Until you give the NIC some command logic, the computer and the network will be unable to communicate. How you do this varies with the design of the NIC. The most common methods are:


■    Jumpers


■    DIP switches


■    EEPROM


   Plug and Play

Setting Jumpers


Jumpers are small connectors that are used to complete a circuit by connecting two pins, indicating a setting to the device, either On or Off. One disadvantage of jumpers is that you can easily drop the cap that makes the


connection inside the computer when changing a jumper setting. Be sure you always have tweezers in your toolkit to retrieve “lost” jumpers. Figure 6.12 shows a jumper and how it is used.


A jumper (above left) can be used to make a connection between various pairs of pins in an array of pins. On some devices you may need to jumper multiple pairs, using several jumpers. This arrangement of six pins offers eight different jumper settings.




You’ll often see devices with just three pins. These are common for devices that require only two settings, like on and off, or enabled and disabled.


Some jumpered cards are clearly labeled on the circuit board with a nomenclature such as IRQ 3 4 5 7 9 10 11 12 13 14 15. Simply put a jumper on the numbered jumper to establish the needed IRQ. Other cards may have labels such as JP8 A B C D E F G H I J K. You will have to refer to the NIC’s documentation to determine the appropriate setting. The NIC’s documentation will usually include a table of configuration settings and which pins to jumper to get them. Table 6.1 shows an example of an IRQ jumper configuration table.

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