D-Link DSL-2500U User Manual page 30

DSL-2500U ADSL/Ethernet Router
User Manual
Parameter
QoS
A class of traffic for this connection.
UBR Without PCR
(Unspecified Bit Rate without Peak Cell 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.
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Configuring via Web-based Interface
Description