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RAVENNA Networking Guide V1.0/3 10
Selecting Components
Switches
6. Quality of Service (QoS) = DiffServ
The switch should support DSCP values, otherwise known as Diffserv.
In data networks, a QoS (Quality of Service) setup is used to prioritise different types of network data. So, for
example, RAVENNA timing information and audio streams
MUST take priority over all other types of network
traffic (e.g. control data, file transfers, web browsing, etc.). In Lawo's RAVENNA devices, DSCP (Differentiated
Services Code Point) values are implemented (this system is known as DiffServ). The default DSCP values are
DSCP 56 (C7) = PTP clock signals; DSCP 46 (EF) = RAVENNA media streams; DSCP 0 (BE) = all other
network traffic. You should check that your network switch is configured to support and prioritise the correct
DSCP classes, and that the default values have not been altered.
7. Port Filtering = Ports must be open to Avahi/Bonjour and Ember+ services
Streaming ports must be open to Avahi/Bonjour and Ember+ services to allow for automatic node detection and
stream announcement.
8. Configuration = Managed Switch (recommended)
A managed switch can be remotely configured, usually from a service computer running a browser-based
interface. This will allow you to easily monitor and adjust the settings described above. See
Network Switch
Configuration for more details.
If you are creating a network with multiple switches, then it may be helpful to choose switches from
the same manufacturer and/or the same model. This will allow you to
copy the switch configuration
from one device to another.