ZyXEL NWA1123-NI User Guide - Page 67

Chapter 6 Wireless LAN

NWA1120 Series User’s Guide

67

Output Power

Set the output power of the NWA in this field. If there is a high density of APs in an area,

decrease the output power of the NWA to reduce interference with other APs. Select one

of the following

Full

(Full Power),

50%

,

25%

or

12.5%

. See the product specifications

for more information on your NWA’s output power.

Preamble Type

Select

Dynamic

to have the AP automatically use short preamble when wireless adapters

support it, otherwise the AP uses long preamble.

Select

Long

if you are unsure what preamble mode the wireless adapters support, and to

provide more reliable communications in busy wireless networks.

RTS/CTS

Threshold

(Request To Send) The threshold (number of bytes) for enabling RTS/CTS handshake.

Data with its frame size larger than this value will perform the RTS/CTS handshake.

Setting this attribute to be larger than the maximum MSDU (MAC service data unit) size

turns off the RTS/CTS handshake. Setting this attribute to its smallest value (1) turns on

the RTS/CTS handshake.

Fragmentation

The threshold (number of bytes) for the fragmentation boundary for directed messages. It

is the maximum data fragment size that can be sent.

Extension

Channel

Protection Mode

You can use

CTS to self

or

RTS-CTS

protection mechanism to reduce conflicts with other

wireless networks or hidden wireless clients. The throughput of

RTS-CTS

is much lower

than

CTS to self

. Using this mode may decrease your wireless performance.

A-MPDU

Aggregation

This field is available only when

802.11n

,

802.11b/g/n

or

802.11a/n

is selected as

the

Wireless Mode

.

Select to enable A-MPDU aggregation.

Message Protocol Data Unit (MPDU) aggregation collects Ethernet frames along with their

802.11n headers and wraps them in a 802.11n MAC header. This method is useful for

increasing bandwidth throughput in environments that are prone to high error rates.

Short GI

This field is available only when

802.11n

,

802.11b/g/n

or

802.11a/n

is selected as

the

Wireless Mode

.

Select

Enabled

to use

Short GI

(Guard Interval). The guard interval is the gap

introduced between data transmission from users in order to reduce interference.

Reducing the GI increases data transfer rates but also increases interference. Increasing

the GI reduces data transfer rates but also reduces interference.

MCS Rate

The

MCS Rate

table is available only when

802.11n

,

802.11b/g/n

or

802.11a/n

is

selected

in the

Wireless Mode

field.

IEEE 802.11n supports many different data rates which are called MCS rates. MCS stands

for Modulation and Coding Scheme. This is an 802.11n feature that increases the wireless

network performance in terms of throughput.

For each MCS Rate (0-15), select either

Enabled

to have the NWA use the data rate.

Clear the

Enabled

check box if you do not want the NWA to use the data rate.

Turn on the

Auto

option to have the NWA set the data rates automatically to optimize the

throughput.

Note: You can set the NWA to use up to four MCS rates at a time.

Apply

Click

Apply

to save your changes.

Cancel

Click

Cancel

to begin configuring this screen afresh.

Table 12

Wireless LAN > Wireless Settings: Repeater (continued)

LABEL

DESCRIPTION

Section	Page
NWA1120 Series	1
Contents Overview	3
Table of Contents	5
User’s Guide	9
Introducing the NWA	11
1.1 Introducing the NWA	11
1.1.1 Dual-Band	12
1.2 Wireless Modes	12
1.2.1 MBSSID	12
1.2.2 Wireless Client	13
1.2.3 Root AP	15
1.2.4 Repeater	15
1.3 Ways to Manage the NWA	16
1.4 Configuring Your NWA’s Security Features	17
1.4.1 Control Access to Your Device	17
1.4.2 Wireless Security	17
1.5 Good Habits for Managing the NWA	17
1.6 Hardware Connections	18
1.7 LED	18
Introducing the Web Configurator	19
2.1 Accessing the Web Configurator	19
2.2 Resetting the NWA	20
2.2.1 Methods of Restoring Factory-Defaults	21
2.3 Navigating the Web Configurator	22
2.3.1 Title Bar	22
2.3.2 Navigation Panel	23
2.3.3 Main Window	24
Dashboard	25
3.1 The Dashboard Screen	25
Tutorial	29
4.1 How to Configure the Wireless LAN	29
4.1.1 Choosing the Wireless Mode	29
4.1.2 Further Reading	29
4.2 How to Configure Multiple Wireless Networks	29
4.2.1 Configure the SSID Profiles	31
4.2.2 Configure the Standard Network	33
4.2.3 Configure the VoIP Network	34
4.2.4 Configure the Guest Network	36
4.2.5 Testing the Wireless Networks	38
4.3 NWA Setup in AP and Wireless Client Modes	38
4.3.1 Scenario	38
4.3.2 Configuring the NWA in MBSSID or Root AP Mode	39
4.3.3 Configuring the NWA in Wireless Client Mode	42
4.3.4 MAC Filter Setup	44
4.3.5 Testing the Connection and Troubleshooting	45
Technical Reference	47
Monitor	49
5.1 Overview	49
5.2 What You Can Do	49
5.3 View Logs	49
5.4 Statistics	50
5.5 Association List	51
5.6 Channel Usage	52
Wireless LAN	55
6.1 Overview	55
6.2 What You Can Do in this Chapter	55
6.3 What You Need To Know	56
6.4 Wireless Settings Screen	60
6.4.1 Root AP Mode	61
6.4.2 Repeater Mode	65
6.4.3 Wireless Client Mode	68
6.4.4 MBSSID Mode	71
6.5 SSID Screen	74
6.5.1 Configuring SSID	75
6.6 Wireless Security Screen	76
6.6.1 Security: WEP	78
6.6.2 Security: WPA, WPA2, WPA2-MIX	79
6.6.3 Security: WPA-PSK, WPA2-PSK, WPA2-PSK-MIX	81
6.7 RADIUS Screen	82
6.8 Layer-2 Isolation	84
6.8.1 Layer-2 Isolation Screen	85
6.9 MAC Filter Screen	86
6.10 Technical Reference	88
6.10.1 Additional Wireless Terms	89
6.10.2 WMM QoS	89
6.10.3 Security Mode Guideline	90
LAN	91
7.1 Overview	91
7.2 What You Can Do in this Chapter	91
7.3 What You Need to Know	91
7.4 LAN IP Screen	93
VLAN	95
8.1 Overview	95
8.1.1 What You Can Do in This Chapter	95
8.2 What You Need to Know	95
8.3 VLAN Screen	96
System	97
9.1 Overview	97
9.2 What You Can Do in this Chapter	97
9.3 What You Need To Know	98
9.4 WWW Screen	100
9.5 Certificates Screen	101
9.6 Telnet Screen	102
9.7 SNMP Screen	104
9.8 FTP Screen	106
9.9 Technical Reference	107
9.9.1 MIB	107
9.9.2 Supported MIBs	108
9.9.3 Private-Public Certificates	108
9.9.4 Certification Authorities	108
9.9.5 Checking the Fingerprint of a Certificate on Your Computer	109
Log Settings	111
10.1 Overview	111
10.2 What You Can Do in this Chapter	111
10.3 What You Need To Know	112
10.4 Log Settings Screen	112
Maintenance	115
11.1 Overview	115
11.2 What You Can Do in this Chapter	115
11.3 What You Need To Know	116
11.4 General Screen	116
11.5 Password Screen	117
11.6 Time Screen	118
11.7 Firmware Upgrade Screen	119
11.8 Configuration File Screen	120
11.8.1 Backup Configuration	120
11.8.2 Restore Configuration	120
11.8.3 Back to Factory Defaults	121
11.9 Restart Screen	121
Troubleshooting	123
12.1 Power, Hardware Connections, and LEDs	123
12.2 NWA Access and Login	124
12.3 Internet Access	125
12.4 Wireless LAN	126
Setting Up Your Computer’s IP Address	129
Pop-up Windows, JavaScript and Java Permissions	157
IP Addresses and Subnetting	169
IPv6	177
Wireless LANs	187
Legal Information	201

ZyXEL NWA1123-NI User Guide - Page 67

Table 12, LABEL, DESCRIPTION, Dynamic, CTS to self, RTS-CTS, 11b/g/n, 11a/n, Wireless Mode, Enabled

Page 67 highlights