Lightware VINX-120-HDMI-ENC User Manual page 47

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8. Appendix
8.7. 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 routing is required; this mode uses a one-to-one association
between the source and the destination: each destination address
uniquely identifies a single Decoder endpoint.
LINK ACT.
CHANNEL 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 routing protocol is required; this mode uses a one-to-many-
of-many or many-to-many-of-many association; datagrams are routed
simultaneously in a single transmission to many recipients.
Network
LINK ACT.
CHANNEL ID
MODE ON DIP
POWER
VIDEO 1 2 3 4
HDMI 8-4-2-1 1GbE LAN
(LOCAL OUT) (AV OUT)
Encoder
Unicast Routing
The network routing requirement of the VINX devices for point-to-
point connection is the unicast routing protocol. Please note the
unicast routing is not the default setting of the Encoder and Decoder,
users have to set it in the devices.
Hardware Requirement:
▪
ATTENTION! VINX Encoder and Decoder send certain system
commands over multicast packages. If the multicast routing 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
LINK ACT.
POWER CHANNEL 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 root 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
LINK ACT.
POWER CHANNEL ID
CONNECT ON DIP
VIDEO
USB
1 2 3 4
HDMI OUTPUT 8-4-2-1 1GbE LAN (AV INPUT) switch (i.e. a managed one) is mandatory. If non-managed switches
Decoder
transmit the multicast packages, the multicast traffic is usually
converted to broadcast and transmitted over all interfaces.
VINX-1x0-HDMI Extenders – User's Manual
POWER
LINK ACT. CONNECT CHANNEL ID
MODE CHANNEL ID 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
LINK ACT. POWER CHANNEL ID
MODE CHANNEL 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
LINK ACT.
1GbE LAN
(AV INPUT)
Managed
CATx
switch
VLAN
LINK ACT.
1GbE LAN
(AV INPUT)
LINK ACT.
CHANNEL ID
MODE ON DIP
POWER
VIDEO
1 2 3 4
HDMI (LOCAL OUT) 8-4-2-1 1GbE LAN (AV OUT)
Encoder
LINK ACT.
MODE CHANNEL ID
POWER ON DIP
VIDEO 1 2 3 4
HDMI 8-4-2-1 1GbE LAN
Encoder (LOCAL OUT) (AV OUT)
LINK ACT.
CHANNEL ID
MODE
POWER ON DIP
VIDEO
1 2 3 4
HDMI 8-4-2-1 1GbE LAN
Encoder (LOCAL OUT) (AV OUT)
LINK ACT.
POWER CHANNEL 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
Why is it important?
By default, Lightware Video-over-IP Encoders and Decoders use
multicast routing. The managed switch in the network shall offer the
following capabilities:
IGMPv2
▪
▪ IGMP snooping
▪ IGMP fast leave
IGMP Querier
▪
▪ Multicast filtering
▪ 9k MTU - Jumbo/Giant frames
47
Fiber
Managed
CATx CATx CATx
switch
Voice/Data VLAN Voice/Data
LINK ACT.
CHANNEL ID
MODE ON DIP
POWER
VIDEO
1 2 3 4
(LOCAL OUT) HDMI 8-4-2-1 1GbE LAN (AV OUT)
Encoder
LINK ACT.
MODE CHANNEL ID
POWER ON DIP
VIDEO 1 2 3 4
HDMI 8-4-2-1 1GbE LAN
Encoder (LOCAL OUT) (AV OUT)
LINK ACT.
CHANNEL ID
MODE
POWER ON DIP
VIDEO
1 2 3 4
HDMI 8-4-2-1 1GbE LAN
Encoder (LOCAL OUT) (AV OUT)
LINK ACT.
POWER CHANNEL ID
CONNECT ON DIP
VIDEO
USB
1 2 3 4
HDMI OUTPUT 8-4-2-1 1GbE LAN (AV INPUT)
Decoder