Application Note (Lw-An-001) - Lightware VINX-110-HDMI-DEC User Manual

   
9. Appendix

9.9. Application Note (LW-AN-001)

Gigabit Network Switch Requirements For VINX Devices
Network Properties
Network-based AV products use different network protocols for
different operations. The network protocol can be UDP/IP and TCP/
IP, the transmission mode can be Broadcast, Unicast, and Multicast.
These network protocols should be familiar to any network engineer.
Because our network-based AV solutions bridge the gap between the
audio-visual (AV) and information technology (IT) worlds, Lightware
suggests involvement of both AV and IT departments in any installation.
Lightware products are designed to be plug-and-play. The figures in
the next section illustrate the basic installation of one Decoder and
one Encoder. A video source provides the digital video content to the
Encoder which converts to Ethernet packets and sends to the attached
Decoder. The Decoder reconstitutes the video with synchronized audio
for presentation to the attached display.
Point-to-point vs Network Connection
VINX Encoders and Decoders have two typical applications:
▪ Point-to-point connection
▪ Point-to-multi point connection
Point-to-point Connection (Unicast mode)
Unicast transmission mode uses a one-to-one association between
the source and the destination: each destination address uniquely
identifies a single Decoder endpoint.
VIDEO LINK ACT.
STREAM ID
MODE
POWER ON DIP
VIDEO
1 2 3 4
HDMI 8-4-2-1 1GbE LAN
(LOCAL OUT) (AV OUT)
Encoder
Point-to-Multi Point Connection (Multicast mode)
Multicast transmission mode uses a one-to-one or one-to-many
association; multicast datagrams are forwarded simultaneously in a
single transmission to many recipients through L2 swithed network.
There can be multiple encoders in a L2 subnet. The decoders has to
be in the same subnet.
Network
LINK ACT.
CHANNEL ID
MODE ON DIP
POWER
VIDEO
1 2 3 4 8-4-2-1
(LOCAL OUT) HDMI 1GbE LAN (AV OUT)
Encoder
Unicast Routing
The packet forwarding requirement of the VINX devices for point-to-
point connection is the unicast switching. Please note the unicast
mode is not the default setting of the Encoder and Decoder, users
have to set it in the devices.
Hardware Requirement:
▪

AAAENAIING!
multicast packages. If the multicast packet forwarding is disabled
on the network, the signal transmission can fail.
Managed Switch for Multicast Routing
In TCP/IP terminology Layer 2 is the data link layer that is responsible
for splitting the information coming from higher layers in the TCP/
IP stack into Ethernet frames. An Ethernet frame includes, among
others, labeling information with source and destination physical
addresses (called source and destination MAC address). These
physical addresses uniquely identify the source and destination
physical devices (e.g. a VINX Encoder and a VINX Decoder). Ethernet
frames provide error resilience by incorporating a redundancy check
VIDEO LINK ACT.
POWER STREAM ID field through which transmission errors can easily be detected. The
CONNECT
VIDEO ON DIP
USB
1 2 3 4
HDMI OUTPUT 8-4-2-1 1GbE LAN
(AV INPUT)
Decoder
device that uses only the physical address information found in the
Ethernet frame to forward a packet from one of its input ports to one
or more of its output ports is an unmanaged switch.
A managed switch, on the other hand, can handle the traffic and forward
input packets to output packets by utilizing information from higher
layers. This gives the managed switch more flexibility and also allows
for more sophisticated functions like multicast forwarding. Since even
a simple VINX network, where one VINX Encoder supplies more VINX
Decoders, relies on multicasting, a multicast capable switch (i.e. a
managed one) is mandatory. If non-managed switches transmit the
multicast packages, the multicast traffic is usually broadcasted over
LINK ACT.
POWER CHANNEL ID
CONNECT
VIDEO ON DIP
USB
1 2 3 4
HDMI OUTPUT 8-4-2-1 1GbE LAN (AV INPUT) all interfaces.
Decoder
VINX-1x0-HDMI Extenders – User's Manual
VIDEO POWER VIDEO
STREAM ID LINK ACT. CONNECT STREAM ID
MODE VIDEO ON DIP
POWER ON DIP
USB 1 2 3 4
VIDEO 1 2 3 4 HDMI OUTPUT 8-4-2-1
HDMI 8-4-2-1 1GbE LAN
(LOCAL OUT) (AV OUT)
Encoder A CATx CATx Decoder A
1 GbE L2 switch
CATx
CATx
VIDEO
VIDEO LINK ACT. POWER STREAM ID
MODE STREAM ID VIDEO CONNECT ON DIP
POWER ON DIP
USB 1 2 3 4
VIDEO 1 2 3 4 8-4-2-1
HDMI 8-4-2-1 1GbE LAN HDMI OUTPUT
(LOCAL OUT) (AV OUT)
Encoder B Decoder B
1 GbE Layer 2 (L2) switch
VINX devices send certain system commands over
LINK ACT.
1GbE LAN
(AV INPUT)
Managed
CATx
switch
VLAN
LINK ACT.
1GbE LAN
(AV INPUT)
VIDEO LINK ACT.
STREAM ID
MODE ON DIP
POWER
VIDEO
1 2 3 4
HDMI (LOCAL OUT) 8-4-2-1 1GbE LAN (AV OUT)
Encoder
VIDEO LINK ACT.
MODE STREAM ID
POWER ON DIP
VIDEO 1 2 3 4
HDMI 8-4-2-1 1GbE LAN
Encoder (LOCAL OUT) (AV OUT)
VIDEO LINK ACT.
STREAM ID
MODE
POWER ON DIP
VIDEO
1 2 3 4
HDMI 8-4-2-1 1GbE LAN
Encoder (LOCAL OUT) (AV OUT)
VIDEO LINK ACT.
POWER STREAM ID
CONNECT ON DIP
VIDEO
USB
1 2 3 4
HDMI OUTPUT 8-4-2-1 1GbE LAN (AV INPUT)
Decoder
Hardware Requirement:
▪ 1 GbE Layer 3 (L3) switch or managed L2 switch
Why is it important?
By default, Lightware Video-over-IP Encoders and Decoders use
multicast packet forwarding. The switches in the network shall offer
the following capabilities:
IGMPv2
▪
▪ IGMP snooping
▪ IGMP fast leave
IGMP Querier
▪
▪ Multicast filtering
▪ 9k MTU - Jumbo/Giant frames
73
Fiber
Managed
CATx CATx CATx
switch
Voice/Data VLAN Voice/Data
VIDEO LINK ACT.
STREAM ID
MODE ON DIP
POWER
VIDEO
1 2 3 4
(LOCAL OUT) HDMI 8-4-2-1 1GbE LAN (AV OUT)
Encoder
VIDEO LINK ACT.
MODE STREAM ID
POWER ON DIP
VIDEO 1 2 3 4
HDMI 8-4-2-1 1GbE LAN
Encoder (LOCAL OUT) (AV OUT)
VIDEO LINK ACT.
STREAM ID
MODE
POWER ON DIP
VIDEO
1 2 3 4
HDMI 8-4-2-1 1GbE LAN
Encoder (LOCAL OUT) (AV OUT)
VIDEO LINK ACT.
POWER STREAM ID
CONNECT ON DIP
VIDEO
USB
1 2 3 4
HDMI OUTPUT 8-4-2-1 1GbE LAN (AV INPUT)
Decoder