D-Link DCS-6517 User Manual page 63

Configuration
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,
queuing theory, and dropping (discarding the packet) decisions. Routers at each
network node classify packets according to their DSCP value and give them a
particular forwarding treatment. For example, how much bandwidth should be
reserved.
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.
D-Link DCS-6517 User Manual 63