Operation Manual

Manual setup
DDNS: Dynamic domain name service
Enable DDNS: Select this option to enable the DDNS setting.
Provider: Select a DDNS provider from the provider drop-down list.
We offer other DDNS providers, such as Dyndns.org (Dynamic) and Dyndns.org (Custom).
Note that before utilizing this function; please apply for a dynamic domain account first.
2.9.4 QoS (Quality of Service)
Quality of Service refers to a resource reservation control mechanism, which guarantees a certain quality to
different services on the network. Quality of service guarantees are important if the network capacity is
insufficient, especially for real-time streaming multimedia applications. Quality can be defined as, for instance,
a maintained level of bit rate, low latency, no packet dropping, etc.
The following are the main benefits of a QoS-aware network:
• The ability to prioritize traffic and guarantee a certain level of performance to the data flow.
• The ability to control the amount of bandwidth each application may use, and thus provide higher reliability
and stability on the network.
Requirements for QoS
To utilize QoS in a network environment, the following requirements must be met:
• All network switches and routers in the network must include support for QoS.
• The network video devices used in the network must be QoS-enabled.
QoS models
CoS (the VLAN 802.1p model)
IEEE802.1p defines a QoS model at OSI Layer 2 (Data Link Layer), which is called CoS, Class of Service. It
adds a 3-bit value to the VLAN MAC header, which 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.
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