The implementation of QoS within a transmission network involves the marking of traffic which is implemented by the traffic source or by an element which identifies the application. Traffic frame classification is then carried out during admission to the transmission network according to the frame marking: The network assigns frames into different queues that have a distinctive set of transmission attributes such as priority. The transmission of frames from each queue is then shaped according to the attributes defined for each queue.
RADWIN 2000* Point-to-Point (PtP) Assures Traffic QoS
User frames entering the PtP IDU port can be marked using 802.1P if needed. The frames are then classified into the following queues: real-time, near-real time, controlled-load, and best-effort.
Rules used to classify traffic are configured by the operator who can assign one or two classifiers to each queue:
- Type of Service (ToS) field in the IP packet header
- 802 1P field in the Ethernet VLAN header
Traffic frames are scheduled from the queues to the air interface in order of priority. Highest priority is given to the real-time traffic queue and lowest priority to the best-effort queue.
To avoid starvation of traffic within lower priority queues, a weight mechanism is used: Each queue is allowed to schedule traffic according to the relative amount of total air-link capacity weight. The weight is configured by the operator while the air-link capacity is continuously evaluated. In addition the operator can limit the Maximum Information Rate (MIR) per each priority queue.
*The feature is supported from version 2.5 and higher in RW 2000C series