Comtech EF Data CDM-760 - Manual (Page 406)

Appendix K Revision 2
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
K–6
Once the Max BW has been reached, the scheduler will not drain any more data irrespective of
the weights.
For Min/Max Mode – The Min BW is served first. Once the minimum BW is met, then the
weights are applied until the Max BW is met. Once the max BW is reached, the scheduler will
not drain any more data irrespective of the weights
K.4.2.2 Weighted Scheduling
In weighted scheduling mode, the QoS scheduler calculates each quantum based on available
bandwidth, total weights, and per-queue weights as follows:
𝑷𝒆𝒓 − 𝒒𝒖𝒆𝒖𝒆 𝒒𝒖𝒂𝒏𝒕𝒖𝒎 = 𝑨𝒗𝒂𝒊𝒍𝒂𝒃𝒍𝒆 𝑩𝒂𝒏𝒅𝒘𝒊𝒅𝒕𝒉 ∗
𝑷𝒆𝒓 𝒒𝒖𝒆𝒖𝒆 𝒘𝒆𝒊𝒈𝒉𝒕
𝑻𝒐𝒕𝒂𝒍 𝒘𝒆𝒊𝒈𝒉𝒕𝒔
There are three exceptions when assigning per-queue quantum to each queue:
1. Per-queue quantum is greater than the maximum configured data rate (Max BW).
When the LAN egress data rate is greater than the assigned Max BW, the scheduler drains
the packets up to the maximum bandwidth only, and drops all other packets. In this
scenario, weight factor will not be applied.
2. Per-queue quantum is less than the maximum configured data rate but more than the
minimum configured data rate.
In this scenario, when the available bandwidth is greater than the total Min BW but less
than total Max BW, the scheduler will first schedule all queues until the minimum
bandwidth is met.
3. Per-queue quantum is less than minimum bandwidth configured.