Quality of Service
314
9.2
Which data packets to prefer?
BAT54-Rail/F..
Release
7.54
06/08
U Full dynamic bandwidth management for sending
Concerning the sending direction, the bandwidth management takes place
dynamically. This means that e.g. a guaranteed minimum bandwidth is only
available, as long as the corresponding data transfer really exists.
An example:
For the transmission of VoIP data of an appropriate VoIP gateway, a band-
width of 256 Kbps is to be guaranteed always. Thereby, each individual VoIP
connection consumes 32 Kbps.
As long as nobody telephones, the entire bandwidth is at the disposal to other
services. Per adjacent VoIP connection 32 Kbps less is available to other ap-
plications, until 8 VoIP connections are active. As soon as a VoIP connection
is terminated, the corresponding bandwidth is available again to all other ap-
plications.
Note: For correct functioning of this mechanism, the sum of the configured
minimum bandwidth must not exceed the effectively available transmis-
sion bandwidth.
U Dynamic bandwidth management also for reception
For receiving bandwidth control, packets can be buffered and only belatedly
confirmed. Thus TCP/IP connections regulate themselves automatically on a
smaller bandwidth.
Each WAN interface is assigned a maximum reception bandwidth. This
bandwidth will be accordingly degraded by every QoS rule that guarantees a
minimum bandwidth of reception on this interface.
D If the QoS rule has been defined connection-related, the reserved band-
width will be unblocked immediately after releasing the connection and
the maximum available bandwidth will increase accordingly on the WAN
interface.
D If the QoS rule has been defined globally, then the reserved bandwidth
will be unblocked only after the ending of the last connection.
For BAT devices with VoIP functions that were already integrated or added
in with a software option, the QoS settings for SIP calls are defined auto-
matically.
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