NETGEAR WGXB102 Router-Mode Router Manual PDF (Setup & Configuration Guide)

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Reference Manual for the 54 Mbps Wall-Plugged Wireless Range Extender WGX102

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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.

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Reference Manual for the 54 Mbps Wall-Plugged Wireless Range Extender WGX102

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Most routers incorporates Auto Uplink

TM

technology (also called MDI/MDIX). Each LOCAL

Ethernet port will automatically sense whether the Ethernet cable plugged into the port should

have a normal connection (e.g. connecting to a computer) or an uplink connection (e.g. connecting

to a router, switch, or hub). That port will then configure itself to the correct configuration. This

feature also eliminates the need to worry about crossover cables, as Auto Uplink

TM

will

accommodate either type of cable to make the right connection.

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Reference Manual for the 54 Mbps Wall-Plugged Wireless Range Extender WGX102

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Wireless Networking Basics

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Appendix C

Wireless Networking Basics

This chapter provides an overview of Wireless networking.

Wireless Networking Overview

The Wireless Range Extender conforms to the Institute of Electrical and Electronics Engineers

(IEEE) 802.11 standard for wireless LANs (WLANs) and a product update will bring the

WGX102 into conformance to the 802.11g standard when it is ratified. On an 802.11b or g

wireless link, data is encoded using direct-sequence spread-spectrum (DSSS) technology and is

transmitted in the unlicensed radio spectrum at 2.5GHz. The maximum data rate for the wireless

link is 11 Mbps, but it will automatically back down from 11 Mbps to 5.5, 2, and 1 Mbps when the

radio signal is weak or when interference is detected. The 802.11g auto rate sensing rates are 1, 2,

5.5, 6, 9, 12, 18, 24, 36, 48, and 54 Mbps.

The 802.11 standard is also called Wireless Ethernet or Wi-Fi by the Wireless Ethernet

Compatibility Alliance (WECA, see

http://www.wi-fi.net

), an industry standard group promoting

interoperability among 802.11 devices. The 802.11 standard offers two methods for configuring a

wireless network — ad hoc and infrastructure.

Infrastructure Mode

With a wireless Access Point, you can operate the wireless LAN in the infrastructure mode. This

mode provides wireless connectivity to multiple wireless network devices within a fixed range or

area of coverage, interacting with wireless nodes via an antenna.

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Reference Manual for the 54 Mbps Wall-Plugged Wireless Range Extender WGX102

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In the infrastructure mode, the wireless access point converts airwave data into wired Ethernet

data, acting as a bridge between the wired LAN and wireless clients. Connecting multiple Access

Points via a wired Ethernet backbone can further extend the wireless network coverage. As a

mobile computing device moves out of the range of one access point, it moves into the range of

another. As a result, wireless clients can freely roam from one Access Point domain to another and

still maintain seamless network connection.

Ad Hoc Mode (Peer-to-Peer Workgroup)

In an ad hoc network, computers are brought together as needed; thus, there is no structure or fixed

points to the network — each node can generally communicate with any other node. There is no

Access Point involved in this configuration. This mode enables you to quickly set up a small

wireless workgroup and allows workgroup members to exchange data or share printers as

supported by Microsoft networking in the various Windows operating systems. Some vendors also

refer to ad hoc networking as peer-to-peer group networking.

In this configuration, network packets are directly sent and received by the intended transmitting

and receiving stations. As long as the stations are within range of one another, this is the easiest

and least expensive way to set up a wireless network.

Network Name: Extended Service Set Identification (ESSID)

The Extended Service Set Identification (ESSID) is one of two types of Service Set Identification

(SSID). In an ad hoc wireless network with no access points, the Basic Service Set Identification

(BSSID) is used. In an infrastructure wireless network that includes an access point, the ESSID is

used, but may still be referred to as SSID.

An SSID is a thirty-two character (maximum) alphanumeric key identifying the name of the

wireless local area network. Some vendors refer to the SSID as network name. For the wireless

devices in a network to communicate with each other, all devices must be configured with the

same SSID.

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