Figure 56 Cos - Honeywell 30 Series Manual

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The network video devices used in the network must be QoS-enabled.
CoS
CoS refers to Class of Service. It indicates the frame priority level from 0 (lowest) to 7
(highest). The priority is set up on the network switches, which then use different
queuing disciplines to forward the packets.

Figure 56 CoS

Enter the VLAN ID of your switch (0~4095) and choose the priority for each application
(0~7).
If you assign Video the highest level, the switch will handle video packets first.
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Note:
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QoS/DSCP
Routers at each network node classify packets according to their DSCP (Differentiated
Services Codepoint) value and give them a forwarding treatment; for example, how
much bandwidth to reserve for it.
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A VLAN Switch (802.1p) is required. Web browsing may fail if the CoS setting is
incorrect.
The Class of Service technologies do not guarantee a level of service in terms of
bandwidth and delivery time; they offer a "best-effort." Users can think of CoS as
"coarsely-grained" traffic control and QoS as "finely-grained" traffic control.
Although CoS is simple to manage, it lacks scalability and does not offer end-to-
end guarantees since it is based on L2 protocol.
Honeywell 30 Series IP Cameras User Guide