DCS-7110 User Manual

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52D-Link DCS-7110 User Manual

Conguration

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.

CoS

IEEE802.1p denes 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

prioritization from 0~7 (Eight dierent classes of service are available). The priority

is set up on the network switches, which then use dierent queuing disciplines to

forward the packets.

Please follow the steps below to enable CoS settings:

1. Click Enable CoS

2. Enter the VLAN ID of your switch (0~4095)

3. Choose the priority for each application (0~7).

Note:

• The VLAN Switch (802.1p) is required. The web browsing may fail if the CoS

setting is incorrect.

• Class of Service technologies do not guarantee a level of service in terms of

bandwidth and delivery time. They only oer a "best-eort." Users can think

of CoS as "coarsely-grained" trac control and QoS as "nely-grained" trac

control.

• Though CoS is simple to manage, it lacks scalability and does not oer end-to-

end guarantees since it is based on L2 protocol.

QoS/DSCP

DSCP-ECN denes QoS at Layer 3 (Network Layer). The Dierentiated Services

(DiServ) model is based on packet marking and router queuing disciplines. The

marking is done by adding a eld to the IP header, called the DSCP (Dierentiated

Services Code Point). This is a 6-bit eld that provides 64 dierent class IDs. It gives

an indication of how a given packet is to be forwarded, known as the Per Hop

Behavior (PHB). The PHB describes a particular service level in terms of bandwidth,

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D-Link DCS-7110 HD Outdoor Day/Night Network Camera