RAVENNA Networking Guide
V1.0/3
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Glossary
Glossary
1000 Base-T
1000 Base-SX
1000 Base-LX
Used in data networks to describe the Ethernet standard. The standard defines the
network speed, cable type and length.
For example, 1000 Base-T is a standard for Gigabit Ethernet over copper wiring. The
1000 refers to the network speed (1000 Mbit/s), while the Base-T refers to the cable
type and length of connection (e.g. twisted pair CAT5, CAT5e, CAT6, CAT7, up to
100m).
Other common Ethernet standards include 100 Base-TX (Fast Ethernet, twisted pair
CAT 5, up to 100m), 1000 Base-SX (Gigabit Ethernet, multi-mode fibre, 220-550
metres), 1000 Base-LX10 (Gigabit Ethernet, single-mode fibre, up to 10km), etc.
AoIP
Audio-over-IP
Avahi
A data network service (similar to Bonjour) that allows devices to publish and discover
nodes running on a Local Area Network. Avahi is an example of a zeroconf (zero-
configuration) networking implementation. Other zeroconf systems include Bonjour
(licensed by Apple).
Buffer Size
The buffer size sets the amount of data stored (in memory) before each data packet is
transmitted or played out. In an audio system, the smaller the buffer size, the lower
the latency, but the more susceptible to drop-outs.
COMi.MX
The name of Lawo's RAVENNA processing hardware device. The COMi.MX forms a
sub component of most of Lawo's RAVENNA IO cards.
DALLIS
Digital and Line Level Interface System.
The name of Lawo's configurable IO device. Each DALLIS frame can be fitted with a
combination of plug-in IO cards (analogue, AES, MADI, RAVENNA, GPIO, etc.).
DHCP
Dynamic Host Configuration Protocol
Commonly used in data networks to dynamically allocate IP addresses from a central
server.
DSCP
Differentiated Services Code Point
DSCP values are used within computer networks to classify and manage different
types of network traffic. For example, to provide low-latency for critical network traffic
such as media streaming, while providing best-effort services to non-critical services
such as web traffic or file transfers. The default DSCP value for RAVENNA streams is
46 (=EF); and for PTP is 56 (=CS7).
Ember+
A non-proprietary TCP/IP interface protocol. An Ember+ provider can "publish"
parameters which may then be used by an Ember+ consumer. For example, to
display information or enable control from a remote device.
Fast Leave
An option often supported by IGMP network switches, which allows the switch to
determine when an output port has left a Multicast group. If this option is not enabled,
then Multicast traffic can flood the output port continuously. See IGMP.
HPET
High Precision Event Timer
A high precision clock reference provided by your PC. It is required for proper
RAVENNA timing with a JADE PC.
HTTP
Hypertext Transfer Protocol
A networking protocol/URL address, commonly used to exchange or transfer web
pages, email, etc.
IGMP
Internet Group Management Protocol
A communications protocol used by adjacent switches/routers on a network to
establish Multicast group memberships.
