Cambium Networks PMP 450 AP, Руководство по настройке

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Chapter 1: Configuration Configuring quality of service
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Proportional Scheduler
This feature, also known as the Rate Plan feature, allows a user to set Plans per SM in units of Kbps. The
proportional scheduler maintains the proportions of the SMs’ plans when the sector is congested. A
default plan setting per direction also exists on the AP and is used in case an SM is not configured with a
Plan (for example, the SM is not upgraded to system release 16.1 yet).
Figure 40 Scheduler Settings on AP
When selecting the Proportional scheduler, CIR is no longer applicable.
In system release 16.1, the SM supports a Proportional Scheduler setting section in the Configuration->
Quality of Service (QoS) page. These settings are applicable only if the AP is configured to use the
Proportional scheduler.
Figure 41 Proportional Scheduler Settings on AP
The above 6 settings parameters are described in detail in the Quality of Service (QoS) page of SM later
in this document.
The proportional scheduler works in conjunction with the Weighted Fair Queuing feature (in the
products that support it), but preserving the plans ratios takes precedence in the scheduler decisions
over honoring the WFQ percentages
High-priority Bandwidth Traffic
To support low-latency traffic such as VoIP (Voice over IP) or video, or critical traffic such as control
packets, the system implements priority data channels. Prior to PMP 450 Release 15.2, the system
allowed for a single High Priority Channel to be configured per SM and per direction, in addition to the
default low priority channel. This channel did not affect the inherent latencies in the system but allowed
high-priority traffic to be immediately served. The high-priority pipe separates low-latency traffic from
traffic that is latency tolerant, such as standard web traffic and file downloads.
From system release 15.2, the system supports up to 4 QoS levels, or data channels, per SM. These are
called Low, Medium, High, and Ultra High data channels.