
Chapter 4: Feature Description
Ethernet Features
Users can attach one of the configured interface shaper profiles to each interface. If no
profile is attached to the interface, no egress shaping is performed on that interface.
Line Compensation for Shaping
Users can configure a line compensation value for all the shapers under a specific logical interface.
For more information, see
Egress Scheduling
Egress scheduling is responsible for transmission from the priority queues. PTP 820S uses a
unique algorithm with a hierarchical scheduling model over the three levels of the egress path that
enables compliance with SLA requirements.
The scheduler scans all the queues over all the service bundles, per interface, and determines
which queue is ready to transmit. If more than one queue is ready to transmit, the scheduler
determines which queue transmits first based on:
•
Queue Priority – A queue with higher priority is served before lower-priority queues.
•
Weighted Fair Queuing (WFQ) – If two or more queues have the same priority and are ready to
transmit, the scheduler transmits frames from the queues based on a WFQ algorithm that
determines the ratio of frames per queue based on a predefined weight assigned to each
queue.
The following figure shows the scheduling mechanism for a single service bundle (equivalent to
Standard QoS). When a user assigns traffic to more than a single service bundle (H-QoS mode),
multiple instances of this model (up to 32 per port) are valid.
Figure 63 Scheduling Mechanism for a Single Service Bundle
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Содержание PTP 820S
Страница 1: ...Cambium PTP 820S Technical Description System Release 7 9 ...
Страница 27: ...Chapter 2 PTP 820S Hardware Description PoE Injector Figure 7 PoE Injector Ports Page 2 8 ...
Страница 156: ...Chapter 6 Standards and Certifications This chapter includes Supported Ethernet Standards Page 6 1 ...
Страница 208: ...Term Definition XPIC Cross Polarization Interference Cancellation Page IV ...