ZyXEL Communications NWA1120 Series User Manual

Chapter 6 Wireless LAN

NWA1120 Series User’s Guide

Repeater Settings

The repeater function allows the NWA in root AP or repeater mode to set up a wireless connection between it 
and another NWA in root AP or repeater mode. 

Note: Repeater security is independent of the security settings between the NWA and any wireless clients.

Local MAC 
Address

Local MAC Address is the MAC address of your NWA. 

Repeater SSID 
Profile

Select the SSID profile you want to use for repeater connections.

Note: You can only configure None, WPA-PSK or WPA2-PSK security mode for the SSID 

used by a repeater connection.

Advanced Settings

Beacon Interval

When a wirelessly network 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 lowpower mode before waking 
up to handle the beacon. 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 Active Power Management 
mode. A high DTIM value can cause clients to lose connectivity with the network. 

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, 802.11a/n or 802.11a/n/ac 
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, 802.11a/n or 802.11a/n/ac 
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.

Wireless LAN > Wireless Settings: Root AP (continued)