Draytek VigorAccess User's Installation Manual page 48

3.2 Quality of Service (QoS)
Quality of Service (QoS) refers to the capability of a network to provide better service
to select network traffic over various technologies. The primary goal of QoS is to
provide priority including dedicated bandwidth, controlled jitter and latency (required
by some real-time and interactive traffic), and improved loss characteristics. Also it is
important to make sure that providing priority for one or more flows does not make
other flows fail. QoS technologies provide the elemental building blocks that will be
used for future business applications in campus, WAN and service provider networks.
3.2.1 Prioritized Bridging
IP DSLAM supports for multiple queues per port. There are different queues both on
ATM and Ethernet uplink.
Four queues supported per ATM port.
Eight queues supported per physical Ethernet port.
3.2.2 Scheduling Mechanisms
IP DSLAM supports multiple scheduling mechanisms.
Strict Priority Scheduling
Probabilistic Priority Scheduling
3.2.3 Rate Limiting
IP DSLAM supports rate-limiting function in input/output both direction.
Input Rate Limiting (IRL) on a per-AAL5 interface.
Output Rate Limiting (ORL) on a per ATM-port basis
Output Rate Limiting (ORL) on a per-physical Ethernet Interface basis.
One feature supports for buffer admission control triggered using IRL. Moreover, it
also supports for dynamic modification of ORL on ATM and Ethernet interfaces.
3.2.4 Mapping Table
IP DSLAM supports a packet priority to traffic class mapping table supported on a per
egress bridge port.
VigorAccess User Installation Guide
48