
Chapter 4: Feature Description
Ethernet Features
Global WRED Profile Configuration
PTP 820S supports 30 user-configurable WRED profiles and one pre-defined (default) profile. The
following are the WRED profile attributes:
•
Green Minimum Threshold – Permitted values are 0 Kbytes to 8 Mbytes, with granularity of
8 Kbytes.
•
Green Maximum Threshold – Permitted values are 0 Kbytes to 8 Mbytes, with granularity of
8 Kbytes.
•
Green-Maximum Drop – Permitted values are 1% to 100%, with 1% drop granularity.
•
Yellow Minimum Threshold – Permitted values are 0 Kbytes to 8 Mbytes, with granularity of
8 Kbytes.
•
Yellow Maximum Threshold – Permitted values are 0 Kbytes to 8 Mbytes, with granularity of
8 Kbytes.
•
Yellow Maximum Drop – Permitted values are 1% to 100%, with 1% drop granularity.
Note
K is equal to 1024.
Users can enter any value within the permitted range. Based on the value entered by the user, the
software automatically rounds off the setting according to the granularity. If the user enters a value
below the lowest granular value (except 0), the software adjusts the setting to the minimum.
For each curve, frames are passed on and not dropped up to the minimum Green and Yellow
thresholds. From this point, WRED performs a pseudo-random drop with a ratio based on the
curve up to the maximum Green and Yellow thresholds. Beyond this point, 100% of frames with
the applicable Color are dropped.
The system automatically assigns the default “tail drop” WRED profile (Profile ID 31) to every
queue. Users can change the WRED profile per queue based on the application served by the
queue.
Standard QoS and Hierarchical QoS (H-QoS)
In a standard QoS mechanism, egress data is mapped to a single egress interface. This single
interface supports up to eight priority queues, which correspond to the CoS of the data. Since all
traffic for the interface egresses via these queues, there is no way to distinguish between different
services and traffic streams within the same priority.
The figure below shows three services, each with three distinct types of traffic streams:
•
Voice – high priority
•
Data – medium priority
•
Streaming – lower priority
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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 ...