GetNet GR-534W Router Manual PDF (Setup & Configuration Guide)

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61

Field

Description

network traffic is dense should use shorter

preambles.

Short Preamble is mainly applied to the efficiency

improvement of real- time applications, such as

streaming video, and Voice-Over-IP telephony.

Short Slot

Enable or disable short slot.

Tx Burst

Tx Burst can be used to improve the efficiency of

data transmission. It can make system transmit

more data during a period of time.

Pkt_Aggregate

Pkt_Aggregate can aggregate multiple data packets

together for improving the transmission efficiency.

Country Code

Select a proper country code in the drop down list.

°

Wi-Fi Multimedia

The parameters of WMM are described as follows:

Field

Description

Wi-Fi Capable

Enable or disable WMM. After enabling WMM, AP

can process different types of wireless data

according to their priority levels.

APSD Capable

Enable or disable APSD. After enabling APSD, it

can decrease the consumption of the power supply

device.

DLS Capable

Enable or disable DLS.

WMM Parameters

Click the

WMM Configuration

button to display the

configuration page of WMM parameters.

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62

°

Multicast-to-Unicast Converter

Enable or disable

Multicast-to-Unicast

. After enabling this function, the transmission

quality of wireless multicast stream can be improved.

°

About WMM

-

WMM Access Categories

At present, WMM defines traffic into 4 access categories.

AC_VO: Voice (highest priority)

AC_VI: Video (high priority)

AC_BE: Best effort (medium priority)

AC_BK: Background (low priority)

802.11 uses DCF (Distributed Coordination Function) scheme of the CSMA/CA

(Carrier Sense Multiple Access / Collision Avoidance) protocol to reduce the chances

of packets collision while one more devices access the wireless media at the same

time. A client wishing to transmit has to first listen to the channel for a predetermined

amount of time so as to check for any activity on the channel. If the channel is sensed

"idle" then the client is permitted to transmit. If the channel is sensed as "busy" the

station has to defer its transmission. The random interval provides a fair transmission

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63

chance for all the devices.

When each priority queue waits for sending packets, it has to wait a fixed time AIFSN

and a random time CW. They define time values by multiple time slots. For 802.11b,

its time slot is 20ms. The time slot of 802.11a and 802.11g is 9 ms. CW insures the

random delay time of DCF, so that the packets collision among the devices with the

same access category can be avoided. If collision occurs, CW is doubled until it

exceeds its maximum value. After every successful transmission, CW returns to the

minimum value.

The priority queue that succeeds in the competition of sending packets will acquire

Txop time to send packets. If the txop value is 0, it is limited to be a MSDC (MAC

Service Data Unit).

-

Set WMM Parameters

Click the

WMM Configuration

button on the

Advanced Wireless Settings

page, the

following page appears.

On this page, you can configure the WMM parameters of access point and station.

Note:

GR-534W provides standard WMM settings. If you want to modify the parameters

above, please refer to the WMM settings of your WMM products.

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64

The parameters on this page are described as follows:

Field

Description

Aifsn

Aifsn (Arbitrary Inter-Frame Space Number). This

parameter influences the delay time of WMM access

category. If you use voice or video service, you’d

better set this parameter to be smaller in the fields of

AC_VI and AC_VO. If it is E-mail or Web service,

you should set a bigger value in the fields of AC_BE

and AC_BK.

Cwmin

Cwmin (Mini. Contention Window) also influences

the delay time of WMM access category. The

difference between AC_VI and AC_VO should be

smaller, but the difference between AC_BE and

AC_BK should be bigger.

Cwmax

Cwmax (Max.Contention Window)

Txop

Txop (Opportunity to Transmit) may optimize the

WMM access. Compared to the WMM access that

needs a higher priority, such as AC_VI and AC_VO,

this value should be bigger.

ACM

ACM (Admission Control Mandatory) parameter

only reacts on AC_VI and AC_VO. If you set this

value to be 0, it indicates that AP is in the charge of

the access commands. If this value is 1, it means

the client is in the charge of the access commands.

Ackpolicy

When WMM packets are transmitting, AP will

receive an echo request. If you set this value is 0, it

means AP does not send back an echo request,

which will bring positive effect for WMM. If this value

is 1, AP generates the response to the request.

-

DLS (Direct Link Setup)

GR-534W provides DLS function. Suppose that there are two WMM devices. Enter

the MAC address of a WMM device in the DLS setting of the other device, and then

connect the two WMM devices to the GR-534W. In this way, these two WMM devices

can transmit message directly.

If you want to configure WMM DLS, do as follows:

Step1

Prepare two wireless network cards (A and B) and one GR-534W.

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Step2

Enable the DLS function on the

Advanced Wireless Settings

page.

Step3

Enable the DLS function of wireless network cards. Enter the MAC address

of wireless card A on the

WMM

page of the wireless network card B, and

then click the

Apply

button.

Step4

If DLS succeeds, you can view the MAC address of wireless card A on the

WMM

page of wireless card B, and vice versa.

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