D-Link DWL-2210AP Router Manual PDF (Setup & Configuration Guide)

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101

The random backoff used by the access point is a conﬁgurable parameter. To describe

the random delay, a “Minimum Contention Window” (MinCW) and a “Maximum Contention

Window” (MaxCW) is deﬁned.

Packet Bursting for Better Performance

The D-Link DWL-2210AP includes 802.11e based

packet bursting

technology that

increases data throughput and speed of transmission over the wireless network. Packet

bursting enables the transmission of multiple packets without the extra overhead of header

information. The effect of this is to increase network speed and data throughput. The

size of packet bursts allowed (maximum burst length) is a conﬁgurable parameter.

The value speciﬁed for the Minimum Contention Window is the upper limit of a

range for the initial random backoff wait time. The number used in the random

backoff is initially a random number between 0 and the number deﬁned for the

Minimum Contention Window.

If the ﬁrst random backoff time ends before successful transmission of the data frame,

the access point increments a retry counter, and doubles the value of the random

backoff window. The value speciﬁed in the Maximum Contention Window is the upper

limit for this doubling of the random backoff. This doubling continues until either the

data frame is sent or the Maximum Contention Window size is reached.

•

Conﬁguring Queues for Qualty of Service (QoS)

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102

Navigating to QoS Settings

Conﬁguring QoS Queues

Conﬁguring Quality of Service (

QoS

) on the D-Link DWL-2210AP consists of setting

parameters on existing queues for different types of wireless trafﬁc, and effectively

specifying minimum and maximum wait times (via

Contention Windows

) for transmission.

The settings described here apply to data transmission behavior on the access point

only, not to that of the client stations.

To set up queues for QoS, navigate to the

Advanced > QoS

tab, and conﬁgure settings

as described below.

For the Guest interface, QoS queue settings apply to the access point load as a whole (both

BSS

es together).

On a two-radio access point these settings apply to both radios but the trafﬁc for each radio

is queued independently. (The exception to this is guest trafﬁc as noted below.)

Internal and Guest network trafﬁc is always queued together within each radio. This is the

case on both one-radio and two-radio APs.

•

Conﬁguring Queues for Qualty of Service (QoS)

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103

Queue

Queues are deﬁned for different types of data transmitted from

AP-to-station:

Data 0 (bulk)

Lowest priority queue, high throughput. Bulk data that requires

maximum throughput and is not time-sensitive is sent to this

queue (FTP data, for example).

For information purposes, the hexadecimal values to describe

this queue are in the following ranges:

0X02 - 0X03

0X08 - 0X0F

Data 1 (best effort)

Medium priority queue, medium throughput and delay. Most

traditional IP data is sent to this queue.

For information purposes, the hexadecimal values to describe

this queue are in the following ranges:

0x00 - 0X01

0X04 - 0X07

0X18 - 0X1F

Data 2 (interactive)

Highest priority queue, minimum delay. Time-sensitive data

such as VoIP and streaming media are automatically sent to this

queue.

For information purposes, the hexadecimal values to describe

this queue are in the following ranges:

0x10 - 0X17

Data 3 (not used)

For more information, see “QoS Queues and Parameters to

Coordinate Trafﬁc Flow” in this manual.

Inter-Frame Space

The Interframe Space speciﬁes a wait time (in milliseconds) for

data frames

.

For more information, see “DCF Control of Data Frames and

Interframe Spaces” in this manual.

Field

Description

Conﬁguring Queues for Qualty of Service (QoS)

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104

Min. Contention Window

This parameter is input to the algorithm that determines

the initial random backoff wait time (“window”) for retry

of a transmission.

The value speciﬁed here in the

Minimum Contention

Window

is the upper limit (in milliseconds) of a range

from which the initial random backoff wait time is

determined.

The ﬁrst random number generated will be a number

between 0 and the number speciﬁed here.

If the ﬁrst random backoff wait time expires before the

data frame is sent, a retry counter is incremented and

the random backoff value (window) is doubled.

Doubling will continue until the size of the random

backoff value reaches the number deﬁned in the

Maximum Contention Window.

For more information, see “Random Backoff and

Minimum / Maximum Contention Windows” in this

manual.

Max. Contention Window

The value speciﬁed here in the

Maximum Contention

Window

is the upper limit (in milliseconds) for the

doubling of the random backoff value. This doubling

continues until either the data frame is sent or the

Maximum Contention Window size is reached.

Once the Maximum Contention Window size is reached,

retries will continue until a maximum number of retries

allowed is reached.

For more information, see “Random Backoff and

Minimum / Maximum Contention Windows” in this

manual.

Max. Burst Length

This value speciﬁes (in milliseconds) the Maximum

Burst Length allowed for packet bursts on the wireless

network. A

packet burst

is a collection of multiple

frames transmitted without header information. The

decreased overhead results in higher throughput and

better performance.

For more information, see “Packet Bursting for Better

Performance” in this manual.

Field

Description

Updating Settings

To apply your changes, click

Update Settings

.

Conﬁguring Queues for Qualty of Service (QoS)

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105

Conﬁguring the Wireless Distribution

System (WDS)

The D-Link DWL-2210AP lets you connect multiple access points using a Wireless

Distribution System (

WDS

). WDS allows access points to communicate with one another

wirelessly in a standardized way. This capability is critical in providing a seamless

experience for roaming clients and for managing multiple wireless networks. It can also

simplify the network infrastructure by reducing the amount of cabling required.

The following sections describe how to conﬁgure the WDS on the D-Link DWL-

2210AP:

• Understanding the Wireless Distribution System

• Using WDS to Bridge Distant Wired LANs

• Using WDS to Extend the Network Beyond the Wired Coverage Area

• Backup Links and Unwanted Loops in WDS Bridges

• Security Considerations Related to WDS Bridges

• Navigating to WDS Settings

• Conﬁguring WDS Settings

• Example of Conﬁguring a WDS Link

• Updating Settings

Understanding the Wireless Distribution System

A

Wireless Distribution System

(

WDS

) is an

802.11f

technology that wirelessly connects

access points, known as Basic Service Sets (

BSS

), to form what is known as an

Extended Service Set

(

ESS

).

A

BSS

generally equates to an access point (deployed as a single-AP wireless

“network”), except in cases where multi-BSSID features make a single access point

look like two or more access points to the network. In such cases, the access point

has multiple unique BSSIDs

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