Huawei DR814Q User Manual

Page 51

User Manual
Aolynk DR814Q ADSL2+ Broadband Router

5 Advanced Configuration

II. QoS configuration

For the upstream packets over an ADSL line, your DR814Q supports multiple

asynchronous transfer mode (ATM) services, such as CBR, VBR-rt, VBR, UBR, and

ABR. DR814Q provides different measures, caching space, scheduling priorities, and

service shaping to allocate appropriate bandwidth to ATM services of different types.

This ensures high-performance QoS.

Click in the [PVC Setting] section as shown in Figure 5-1 to enter the

[QoS Config] page of a corresponding PVC as below.

Figure 5-5 QoS Config page

You can set different ATM service types for specified PVCs from the ATM Traffic Class

drop-down list and configure QoS parameters for the selected service type. For more

information, refer to Table 5-1.

Table 5-1 Description of commonly used ATM service types

Service type

Description

UBR
(unspecified
bit rate)

Suitable for services that are not real-time-critical and with large
burst traffic. UBR demands best-effect services on the network
side. When applying for services, you are not required to set QoS
parameters except for PCR, which limits the upper rate. The
network side does not guarantee QoS for UBR services. UBR cells
will be discarded first in a network congestion. Error correction is
carried out by upper-layer protocols. Typical applications are FTP
and E-mail.

CBR
(constant bit
rate)

Suitable for services that require static bandwidth and demand the
highest priority. This type of service can provide stable traffic with
the minimum burst. Only PCR parameter is needed for CBR service
application. The source can transmit cells at a negotiated PCR or a
rate lower than it. Typical applications are circuit and emulated
voice.