User's Manual

Some applications may require the top priority queue, or the top two priority queues
to be in a fixed priority mode while the lower queues work in the weighted approach.
All scheduling modes are selectable on a per port basis.
The port scheduling mode can be one of the following values:
Use a weighted round robin queuing scheme.weighted RRB
Use Strict for priority 3 and use weighted round robin for prior-
ities 2,1 and 0
strict pri 3
Use Strict for priorities 3 and 2 and use weighted round robin
for priorities 1 and 0
strict pri 3, 2
Use a Strict priority scheme for all prioritiesstrict
Speed guard
The speed guard controls automatically the Egress data rate shaping according to
available capacity of the Air channel. The Air channel capacity check and the Egress
shaping adjustment takes place approx. once per 50 ms.
Count mode
Egress rate limiting count mode. This parameter is used to control which bytes in
the transmitted frames are counted for egress rate limiting as follows:
The egress rate limiting is done based on frame count [fps] as
opposed to the byte count [kbps] of the packet.
frame
Preamble (8bytes) + Frame’s DA to CRC + IFG (inter frame gap,
12 bytes)
layer 1
Frame’s DA to CRClayer 2
Frame’s DA to CRC - 18 - 4(if the frame is tagged)layer 3
Only one tag is counted even if the frame contains more than one tag. A frame is
considered tagged if the egress frame going out onto the wire is tagged.
Rate [kbps] /
[fps]
Egress data rate shaping. When Rate = 0 egress rate limiting is disabled.
NOTE: The Count mode parameter is used to control which bytes in the trans-
mitted frames are counted for egress rate limiting.
If the egress shaping is controlled by frame rate, the desired frame rate can vary
from 7.6k to 1.488M frames per second. Valid values are between 7600 and
1488000.
If the egress shaping is controlled by bit rate, the desired rate can vary from 64
kbps to 1 Gbps in the following increments:
Desired rate between 64 kbps and 1 Mbps in increments of 64 kbps
Desired rate between 1 Mbps to 100 Mbps in increments of 1 Mbps
Desired rate between 100 Mbps to 1 Gbps in increments of 10 Mbps
Therefore, the valid values are:
64, 128, 192, 256, 320, 384,..., 960,
1000, 2000, 3000, 4000, ..., 100000,
110000, 120000, 130000, ..., 1000000
Frame overhead
[B]
Egress Rate Frame Overhead adjustment.
This parameter is used to adjust the number of bytes that need to be added to a
frame’s IFG (inter frame gap) on a per frame basis. This is to compensate for a
protocol mismatch between the sending and the receiving stations. For example
if the receiving station were to add more encapsulations to the frame for the nodes
109© RACOM s.r.o. – RAy2 Microwave Link
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