OSI EXAMPLE FOR ETHERNET MEDIA
DATA APPLICATION DATA PRESENTATION DATA SESSION SEGMENTS TRANSPORT
End-to-End Connec=ons and Reliability UDP
PACKETS NETWORK
Path Determina=on and IP (Logic Addressing) IP
FRAMES DATA LINK
MAC and LLC (Physical Addressing) BITS PHYSICAL
Media, Signal and Binary Transmission
to the Internet Protocol.
The top layers make up the
packeting structure, comprised
of UDP and RTP packets used
to both sequence and time-
stamp the audio, video, or data
streams. This the last proto-
col that should receive spe-
cial attention, since it’s how
we insure that the packets that
comprise a given audio, video,
RTP
or data stream are held in the
correct order and have some
time context with regard to
each of the sequential packets.
THE BIGGER PICTURE
In this article, we’ve attempt-
ed to lay out some building
blocks that can help broadcast
engineers enhance their under-
standing of Ethernet for uncom-
ETHERNET
pressed video over IP. With this
basic knowledge, engineers
can start to build a larger and
more complex picture of an
overall network architecture
that must consider aggregated
payloads, SDN, signal manage-
ment, VLANs, and host of best
practices currently being used
in the Ethernet environment.
Scott Barella is chief technology officer for Utah
Scientific and a member of the board of directors
for the Alliance for IP Media Solutions (AIMS),
where he also serves as deputy chairman of the
Technical Working Group.
Broadcast Beat Magazine • www.broadcastbeat.com • 87