Netgear WGR614v2 사용자 설명서

B-12

Network, Routing, Firewall, and Basics

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 and pinout as described in 

.

In the wiring table above, the concept of transmit and receive are from the perspective of the PC, 
which is wired as Media Dependant Interface (MDI). In this wiring, the PC transmits on pins 1 and 
2. At the hub, the perspective is reversed, and the hub receives on pins 1 and 2. This wiring is 
referred to as Media Dependant Interface - Crossover (MDI-X). 

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.

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