4
Network AV Infrastructure Prerequisites
3.
Allow multicast traffic on all network ports through which video streams pass
.
4.
Ensure current Access Control Lists (ACLs) are not filtering multicast or control traffic
.
5.
Remove Flow Control and/or Storm Control on any network port passing the video stream
.
6.
Enable VLANs to separate video traffic from data and voice
.
7.
Enable Jumbo Frames
.
8.
Disable Green Ethernet (or efficiency mode)
. Some switches have the ability to lower the power consumption on the ports as
a
“Green” feature. This can cause issues with bandwidth intensive devices (like our encoders and decoders).
I
MPLEMENTATION
C
ONSIDERATIONS
MV4 devices can be installed on a physically separate network or converged onto an existing GbE network. When implementing,
it is important to decide at the earliest stages of planning if the system will be integrated into the rest of the network or if it will
reside on a dedicated AV network. Each has its own advantages and disadvantages, but wherever possible we recommend the use
of a dedicated AV switch. Using the existing network is of course possible–but it adds extra complexity to the installation and
often removes control of the networking equipment from the site’s AV staff or installer.
The first thing to consider is how much control the install and site teams have over the network configuration. Do they have
access and clearance to change the managed switch configurations on the fly? Is the network administrator willing to make the
necessary changes to support multicast and IGMP traffic on their network? Will they allow the creation of a VLAN or change
their existing VLAN configuration to support the required configuration? If the answer to these questions is no, then it is highly
recommended that the system be installed on a separate dedicated network switch. If this is not an option, then a conversation
needs to take place with the network admin staff to ensure they are aware of the requirements.
S
INGLE
S
WITCH
N
ETWORKING
Single switch networking can be used when there are no more than 100m (328ft) from the central distribution point. Any
network switch should have a backplane capacity of at least (2 x 1000-Mbps x N) where N is the number of ports on the switch
passing the video traffic. For example, a 24-port switch where all available ports may be used to pass video traffic should have a
(2 x 1000 x 24) = 48Gbps backplane.
M
ULTIPLE
S
WITCH
N
ETWORKING
The maximum distance between devices is 100m (328ft) over CAT 5e (or better) cable. This distance can be extended in
increments of 100m (328ft) by using a gigabit switch as a repeater between devices. Copper to fiber adapters can extend the
maximum distance between devices up to 10km through the use of fiber.
When using multiple switches, we recommend at least 10Gbps bi-directional connections between switches.
•
(Link Bandwidth)/(800Mbps) = Number of simultaneous streams across link for 4K and (Link Bandwidth)/(200Mbps) =
Number of simultaneous streams across link for 1080p.
•
The maximum number of streams possible between switches = link bandwidth (10Gbps) / 800Mbps (for 4K) x
number of encoders (or 200Mbps for 1080p).
•
For 4K streaming, the total number of streams (800xn) must be ≤ 10,000.
•
For 1080p streaming, the total number of streams (200xn) must be ≤ 10,000.
