Model FVS328 ProSafe VPN Firewall with Dial Back-up Reference Manual
C-12
Networks, Routing, and Firewall Basics
May 2004, 202-10031-01
Ethernet Cabling
Although Ethernet networks originally used thick or thin coaxial cable, most installations currently
use unshielded twisted pair (UTP) cabling. The UTP cable contains eight conductors, arranged in
four twisted pairs, and terminated with an RJ45 type connector. A normal straight-through UTP
Ethernet cable follows the EIA568B standard wiring as described in
Table 9-1
.
Uplink Switches and Crossover Cables
In the wiring table, the concept of transmit and receive are from the perspective of the PC. For
example, the PC transmits on pins 1 and 2. At the hub, the perspective is reversed, and the hub
receives on pins 1 and 2. When connecting a PC to a PC, or a hub port to another hub port, the
transmit pair must be exchanged with the receive pair. This exchange is done by one of two
mechanisms. Most hubs provide an uplink switch which will exchange the pairs on one port,
allowing that port to be connected to another hub using a normal Ethernet cable. The second
method is to use a crossover cable, which is a special cable in which the transmit and receive pairs
are exchanged at one of the two cable connectors. Crossover cables are often unmarked as such,
and must be identified by comparing the two connectors. Since the cable connectors are clear
plastic, it is easy to place them side by side and view the order of the wire colors on each. On a
straight-through cable, the color order will be the same on both connectors. On a crossover cable,
the orange and blue pairs will be exchanged from one connector to the other.
Table 9-1.
UTP Ethernet cable wiring, straight-through
Pin
Wire color
Signal
1
Orange/White
Transmit (Tx) +
2
Orange
Transmit (Tx) -
3
Green/White
Receive (Rx) +
4
Blue
5
Blue/White
6
Green
Receive (Rx) -
7
Brown/White
8
Brown
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Страница 24: ...Model FVS328 ProSafe VPN Firewall with Dial Back up Reference Manual 2 8 Introduction May 2004 202 10031 01...
Страница 122: ...Model FVS328 ProSafe VPN Firewall with Dial Back up Reference Manual 8 16 Managing Your Network May 2004 202 10031 01...
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Страница 224: ...Model FVS328 ProSafe VPN Firewall with Dial Back up Reference Manual 6 Glossary May 2004 202 10031 01...