Specifications

Profiles
37
devolo dLAN AVpro manager
3.3.3 Transmission prioritisation
Some applications (such as IPTV and VoIP) place high demands on transmission
quality in the dLAN network. In order to guarantee an uninterrupted transmis-
sion of this multimedia content, you can configure your dLAN network so that
certain types of data packets are transmitted with priority [through correspond-
ing Quality of Service settings].
3.3.3.1 Priority levels and VLAN prioritisation
The dLAN standard inherently includes four unique, basic priority levels for data
packets to be transmitted.
These are in ascending priority:
 "bulk" (lowest priority)
 "best effort" (priority is higher than "bulk")
 "video" (priority is higher than "best effort")
 "voice" (priority is higher than "video")
You attain prioritised transmission of the corresponding data in the network by
assigning these priority levels to the corresponding priority values of the Ether-
net frames (VLAN).
The default settings for the transmission prioritisation are optimally co-ordinated
to the requirements of all typical application scenarios (for example, the triple
play services Internet, VoIP and IPTV).
You should make changes to these settings only if you possess the required
detailed technical knowledge!
The prioritised transmission of data in a network requires that the respective
standard is supported by all the devices available in the network (such as
switches, routers, etc.).
By setting up VLANs, you can create virtual local networks which fulfil your se-
curity and performance requirements reliably.
The three VLAN priority bits of the expanded standard Ethernet frame are used
for this. With these bits, values '0' to '7' can be configured; therefore, within the
dLAN network, up to eight different priority values are possible.