Zyxel VMG3926-B10A Router Manual PDF (Setup & Configuration Guide)

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Chapter 7 Wireless

VMG3926-B10A User’s Guide

101

7.6.1

WDS Scan

You can click the

Scan

icon in

Wireless > WDS

to have the VMG automatically search and display

the available APs within range. Select an AP and click

Apply

to have the VMG establish a wireless

link with the selected wireless device.

Figure 39

WDS: Scan

The following table describes the labels in this screen.

MAC Address

This shows the MAC address of the peer device.

You can connect to up to 4 peer devices.

Modify

Click the

Edit

icon and type the MAC address of the peer device in a valid MAC address

format (six hexadecimal character pairs, for example 12:34:56:78:9a:bc).

Click the

Delete

icon to remove this entry.

Scan

Click the

Scan

icon to search and display the available APs within range.

Apply

Click

Apply

to save your changes.

Cancel

Click

Cancel

to restore your previously saved settings.

Table 24

Network Setting > Wireless > WDS (continued)

LABEL

DESCRIPTION

Table 25

WDS: Scan

LABEL

DESCRIPTION

Wireless Bridge Scan Setup

Refresh

Click

Refresh

to update the table.

#

This is the index number of the entry.

SSID

This shows the SSID of the available wireless device within range.

BSSID

This shows the MAC address of the available wireless device within range.

Apply

Click

Apply

to save your changes.

Cancel

Click

Cancel

to restore your previously saved settings.

Page 102 / 327

Chapter 7 Wireless

VMG3926-B10A User’s Guide

102

7.7

The Others Screen

Use this screen to configure advanced wireless settings. Click

Network Setting > Wireless >

Others

. The screen appears as shown.

See

Section 7.9.2 on page 106

for detailed definitions of the terms listed in this screen.

Figure 40

Network Setting > Wireless > Others

The following table describes the labels in this screen.

Table 26

Network Setting > Wireless > Others

LABEL

DESCRIPTION

RTS/CTS

Threshold

Data with its frame size larger than this value will perform the RTS (Request To Send)/CTS

(Clear To Send) handshake.

Enter a value between 0 and 2347.

Fragmentation

Threshold

This is the maximum data fragment size that can be sent. Enter a value between 256 and

2346.

Auto Channel

Timer

If you set the channel to

Auto

in the

Network Setting > Wireless > General

screen,

specify the interval in minutes for how often the VMG scans for the best channel. Enter 0 to

disable the periodical scan.

Output Power

Set the output power of the VMG. If there is a high density of APs in an area, decrease the

output power to reduce interference with other APs. Select one of the following:

20%

,

40%

,

60%

,

80%

or

100%

.

Beacon Interval

When a wirelessly networked device sends a beacon, it includes with it a beacon interval.

This specifies the time period before the device sends the beacon again.

The interval tells receiving devices on the network how long they can wait in low power

mode before waking up to handle the beacon. This value can be set from 50ms to 1000ms.

A high value helps save current consumption of the access point.

DTIM Interval

Delivery Traffic Indication Message (DTIM) is the time period after which broadcast and

multicast packets are transmitted to mobile clients in the Power Saving mode. A high DTIM

value can cause clients to lose connectivity with the network. This value can be set from 1

to 255.

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Chapter 7 Wireless

VMG3926-B10A User’s Guide

103

7.8

The Channel Status Screen

Use the

Channel Status

screen to scan wireless LAN channel noises and view the results. Click

Network Setting > Wireless > Channel Status

. The screen appears as shown. Click

Scan

to

scan the wireless LAN channels. You can view the results in the

Channel Scan Result

section.

802.11 Mode

Select

802.11b Only

to allow only IEEE 802.11b compliant WLAN devices to associate with

the VMG.

Select

802.11g Only

to allow only IEEE 802.11g compliant WLAN devices to associate with

the VMG.

Select

802.11n

Only

to allow only IEEE 802.11n compliant WLAN devices to associate with

the VMG.

Select

802.11b/g Mixed

to allow either IEEE 802.11b or IEEE 802.11g compliant WLAN

devices to associate with the VMG. The transmission rate of your VMG might be reduced.

Select

802.11b/g/n Mixed

to allow IEEE 802.11b, IEEE 802.11g or IEEE802.11n

compliant WLAN devices to associate with the VMG. The transmission rate of your VMG

might be reduced.

802.11

Protection

Enabling this feature can help prevent collisions in mixed-mode networks (networks with

both IEEE 802.11b and IEEE 802.11g traffic).

Select

Auto

to have the wireless devices transmit data after a RTS/CTS handshake. This

helps improve IEEE 802.11g performance.

Select

Off

to disable 802.11 protection. The transmission rate of your VMG might be

reduced in a mixed-mode network.

This field displays

Off

and is not configurable when you set

802.11 Mode

to

802.11b

Only

.

RIFS

Select

Auto

to enable the Reduced Inter-frame Spacing (RIFS) feature. It improves the

Device’s performance by reducing the amount of dead time required between OFDM

transmissions. Select

Off

to disable the feature.

Preamble

Select a preamble type from the drop-down list box. Choices are

Long

or

Short

. See

Section 7.9.7 on page 110

for more information.

This field is configurable only when you set 802.11 Mode to

802.11b

.

RX Chain Power

Save

Select

Enable

to activate the RX Chain Power Save feature. It turns off one of the Receive

chains to save power when it is not in use. Select

Disabled

to disable this feature.

OBSS

Coexistence

Select

Enable

to allow the coexistence of 20 MHz and 40 MHz Overlapping Basic Service

Sets (OBSS) in wireless local area networks. Select

Disabled

to disable this feature.

XPress

TM

Technology

Select

Enable

for higher speeds, especially if you have both IEEE 802.11b and IEEE

802.11g wireless clients. The wireless clients do not have to support XPress™ Technology,

although the performance enhancement is greater if they do. Select

Disabled

to disable

this feature.

WPS 2.0

Select

Enable

to support WPS 2.0 which enhances WPS security and flexibility on

configuration. Select

Disabled

to disable this feature.

Apply

Click

Apply

to save your changes.

Cancel

Click

Cancel

to restore your previously saved settings.

Table 26

Network Setting > Wireless > Others (continued)

LABEL

DESCRIPTION

Page 104 / 327

Chapter 7 Wireless

VMG3926-B10A User’s Guide

104

Note: The

Scan

button only works when the VMG uses 20MHz for the wireless channel

width. You can go to the

Network Setting > Wireless >

General

screen, click the

more

link, and then change the channel width setting in the

Bandwidth

field.

Figure 41

Network Setting > Wireless > Channel Status

7.9

Technical Reference

This section discusses wireless LANs in depth. For more information, see

Appendix B on page 287

.

7.9.1

Wireless Network Overview

Wireless networks consist of wireless clients, access points and bridges.

•

A wireless client is a radio connected to a user’s computer.

•

An access point is a radio with a wired connection to a network, which can connect with

numerous wireless clients and let them access the network.

•

A bridge is a radio that relays communications between access points and wireless clients,

extending a network’s range.

Traditionally, a wireless network operates in one of two ways.

•

An “infrastructure” type of network has one or more access points and one or more wireless

clients. The wireless clients connect to the access points.

•

An “ad-hoc” type of network is one in which there is no access point. Wireless clients connect to

one another in order to exchange information.

Page 105 / 327

Chapter 7 Wireless

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105

The following figure provides an example of a wireless network.

Figure 42

Example of a Wireless Network

The wireless network is the part in the blue circle. In this wireless network, devices

A

and

B

use the

access point (

AP

) to interact with the other devices (such as the printer) or with the Internet. Your

VMG is the AP.

Every wireless network must follow these basic guidelines.

•

Every device in the same wireless network must use the same SSID.

The SSID is the name of the wireless network. It stands for Service Set IDentifier.

•

If two wireless networks overlap, they should use a different channel.

Like radio stations or television channels, each wireless network uses a specific channel, or

frequency, to send and receive information.

•

Every device in the same wireless network must use security compatible with the AP.

Security stops unauthorized devices from using the wireless network. It can also protect the

information that is sent in the wireless network.

Radio Channels

In the radio spectrum, there are certain frequency bands allocated for unlicensed, civilian use. For

the purposes of wireless networking, these bands are divided into numerous channels. This allows a

variety of networks to exist in the same place without interfering with one another. When you

create a network, you must select a channel to use.

Since the available unlicensed spectrum varies from one country to another, the number of

available channels also varies.

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