D-Link DSL-2520U User Manual page 32

DSL-2520U ADSL2/2+ Router with USB and Ethernet Ports

User Manual

Parameter

QoS

A class of traffic for this connection.

UBR

(Unspecified Bit Rate): The UBR service is used for applications

that allow various delays and losses of packets. It is appropriate to

use the UBR service for text/data/image transfer applications, as

well as messaging, distribution, retrieval, and remote terminal

applications.

UBR With PCR

(Unspecified Bit Rate with Peak Cell Rate): The UBR service is

used for applications that allow various delays and losses of

packets. The Peak Cell Rate is a determining factor in how often

cells are sent in an effort to minimize lag or jitter caused by traffic

inconsistencies. When you select this value from the drop-down list,

the Peak Cell Rate field is displayed. Specify a required value (in

cells per second).

CBR

(Constant Bit Rate): This service is used for applications that

require a constant data rate. It is mostly used for transferring

uncompressed audio and video, e.g. videoconferencing, interactive

audio (telephony), audio/video distribution (television, distance

education, e-shops), and retrieval (video-on demand, audio

libraries). When you select this value from the drop-down list, the

Peak Cell Rate field is displayed. Specify a required value (in

cells per second).

Non Realtime VBR

(Non-Real-time Variable Bit Rate): This service can be used for

transferring data that have critical response-time requirements, e.g.

air ticket booking, bank transactions, and process monitoring. When

you select this value from the drop-down list, the Peak Cell Rate,

Sustainable Cell Rate, and Maximum Burst Size fields are

displayed. Specify required values.

Realtime VBR

(Real-time Variable Bit Rate): This service is used for delay-

sensitive applications such as real time video. The Rt-VBR provides

higher network flexibility than the CBR service. When you select

this value from the drop-down list, the Peak Cell Rate,

Sustainable Cell Rate, and Maximum Burst Size fields are

displayed. Specify required values.

Page 32 of 67

Configuring via Web-based Interface

Description