
Chapter 4: Feature Description
Ethernet Features
The egress path consists of the following QoS building blocks:
•
Queue Manager – This is the mechanism responsible for managing the transmission queues,
utilizing smart WRED per queue and per packet color (Green or Yellow).
•
Scheduling and Shaping – A hierarchical mechanism that is responsible for scheduling the
transmission of frames from the transmission queues, based on priority among queues,
Weighted Fair Queuing (WFQ) in bytes per each transmission queue, and eligibility to transmit
based on required shaping on several different levels (per queue, per service bundle, and per
port).
•
Marker – This mechanism provides the ability to modify priority bits in frames based on the
calculated CoS and Color.
The following two modes of operation are available on the egress path:
•
Standard QoS – This mode provides eight transmission queues per port.
•
Hierarchical QoS (H-QoS) – In this mode, users can associate services from the service model
to configurable groups of eight transmission queues (service bundles), from a total 2K queues.
In H-QoS mode, PTP 820S performs QoS in a hierarchical manner in which the egress path is
managed on three levels: ports, service bundles, and specific queues. This enables users to
fully distinguish between streams, therefore providing a true SLA to customers.
•
The following figure illustrates the difference between how standard QoS and H-QoS handle
traffic:
Figure 54 Standard QoS and H-QoS Comparison
Standard QoS
Ethernet
Radio
Eth.
traffic
Service 1
Service 2
Service 3
Voice
Data
Streaming
V
D
S
V
V
D
D
S
S
H-QoS
Ethernet
Radio
Service 1
Service 2
Service 3
V
D
S
Service 1
Service 2
Service 3
V
D
S
V
D
S
Page 4-59
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 ...