User's Manual

StreamCaster MIMO Radio User Manual 12/19/18
10017C000 Silvus Technologies Confidential Page
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the jitter buffer in common video decoders (e.g. VLC). The worst case end-to-end delay will be
incremented by the receiver timeout value.
Retransmissions Enabled – Packet re-ordering and end-to-end retransmissions enabled in case
of packet loss. The retransmission timeout is the time the transmitter will wait before re-sending
a lost packet. The worst case end-to-end delay will be incremented by the retransmission timeout
value.
Determining Timeout Value – Both receiver timeout and retransmission timeout should be set
to roughly 3 times the end-to-end latency. The end-to-end latency can be found by disabling e2e
and doing a ping between the transmitter and receiver.
QoS Scheduler (Beta Feature – License Enabled)
The Quality of Service (QoS) Scheduler feature provides a Hierarchical Token Bucket (HTB)
scheduler. The scheduler prioritizes traffic based on the packets DSCP value. There are 12 queues
in the scheduler; each with an assignable minimum bandwidth guarantee. First, the minimum
guarantees are fulfilled for all queues waiting to transmit traffic out. If there is bandwidth
remaining, it becomes available to highest priority traffic (lower number means higher priority)
and it will take as much bandwidth as it needs to transmit out its data. Next, the remaining
bandwidth will become available to the next lowest priority queue and so on. Traffic flows which
map to the same priority will fairly share the available bandwidth using the Fair Queuing with
Control Delay (FQ_CoDeL) scheduling algorithm. The feature is applicable to IPv4 and IPv6
untagged and tagged packets. Fragmented packets are not supported. Detailed below is the DSCP
to queue/priority mapping.
Queue
Priority
DSCP
TOS
DSCP
Name
1
0
0x30
0xC0
CS6
2
1
0x2E
0xB8
EF
3
2
0x28
0xA0
CS5
4
3
0x26
0x98
AF43
0x24
0x90
AF42
0x22
0x88
AF41
5
3
0x20
0x80
CS4
6
4
0x1E
0x78
AF33
0x1C
0x70
AF32