The Prioritization of Network Applications and Network Devices
135
•
Discard low-priority packets in order to ensure the trans-
mission of higher-priority packets. This algorithm is
used whenever more packets are supposed to be sent to
the Internet than the upstream transmission rate of the
Internet connection alllows.
•
As long as no packets are being sent from higher-priority
applications, the full transmission rate of the Internet
connection is available for low-priority packets.
Categories for Prioritization
There are three categories for prioritization: “Real-time appli-
cations”, “Prioritized applications” and “Background appli-
cations”. The categories are explained below.
•
Real-time applications
This category is suitable for applications with high de-
mands on transmission speed and reaction times (for
example, Internet telephony, IPTV, video on demand).
–
Network applications of this category always have
priority over other applications accessing the Inter-
net at the same time.
–
When the Internet connection is working at full ca-
pacity, the network packets of the applications of
this category will always be sent first. In this case da-
ta from network applications assigned to other cate-
gories, like “Prioritized applications”, will be trans-
mitted later.
–
If multiple network applications are assigned to this
category, then they must share the available capacity.
–
Whenever Internet telephony is included in this cate-
gory, this application always has the highest priority,
even over other real-time applications.
