Netgear WGR614 v5 Uživatelský manuál stáhnout pdf (Strana 114)

Reference Manual for the 54 Mbps Wireless Router WGR614 v5

B-14 Network, Routing, Firewall, and Basics

July 2004 202-10036-01

Figure B-6: Category 5 UTP Cable with Male RJ-45 Plug at Each End

Note: Flat “silver satin” telephone cable may have the same RJ-45 plug. However, using telephone

cable results in excessive collisions, causing the attached port to be partitioned or disconnected

from the network.

Uplink Switches, Crossover Cables, and MDI/MDIX Switching

In the wiring table above, the concept of transmit and receive are from the perspective of the

computer, which is wired as Media Dependant Interface (MDI). In this wiring, the computer

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 computer to a computer, 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 green pairs will be

exchanged from one connector to the other.

1 2 ... 109 110 111 112 113 114 115 116 117 118 119 ... 171 172

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Netgear WGR614 v5 Uživatelský manuál Strana 114