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Network AV Infrastructure Prerequisites
There are two ways to implement multicast routing when using our equipment:
•
IGMP
(Internet Group Management Protocol): Allows video streams (groups) to be dynamically routed only to those ports
requesting the video stream. The IGMP feature prevents the multicast video traffic from flooding the network and can
significantly reduce traffic in a layer-3 network. This is the recommended setting for our equipment.
•
http://docwiki.cisco.com/wiki/Internet_Protocol_Multicast#Protocol-Independent_Multicast
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N
ETWORK
R
EQUIREMENTS
For help determining the network requirements for your Visionary Solutions installation, please contact
P
OWER
O
VER
E
THERNET
(P
O
E)
Power over Ethernet (PoE) is a system that uses an PoE Ethernet switch as a power source to provide both electrical power and data
over a single cable to devices on a network, such as the E4200/D4200 devices. This reduces the number of cables and power supplies
that are required to power the devices in the network. The result is lower cost, less downtime, easier maintenance, and greater
flexibility for the network installation.
When selecting a PoE power supply scheme, is it important to select a PoE Ethernet switch that is capable of providing enough
power per port, as well as total power to accommodate all devices simultaneously. You should plan on the maximum available PoE
power per port for E4200/D4200 (15.4W). In some operating conditions less power will be demanded per E4200/D4200, call
Visionary Solutions for details.
To calculate the number of devices that can be used on a PoE Ethernet switch, divide the total PoE power capability of the switch by
the power required for each port and round down. For example, many PoE Ethernet switches can provide up to 370W of DC power. If
each port needs 15.4W of power, a switch can supply power to a total of 24 ports.
Examples
:
•
A Cisco SG300-52P has a PoE power output of 375W and the ports require 15.4W: 375 / 15.4 = 24.35. Therefore, 24 devices can
be powered by this switch.
•
A Cisco SG300-52MP has a PoE power output of 740W and the ports require 15.4W: 740 / 15.4 = 48. Therefore, 48 devices can
be powered by this switch.
Some switches can only supply PoE power to a certain number of ports. If it is necessary to use this type of switch, PoE injectors can
be used or a local power supply can be provided for the switch, or you may need to disable the detection of the PoE for those ports in
the Ethernet switch.
Exceeding the PoE switch limit can cause erratic behavior on the network system. The PoE switch cuts power to prevent overloading,
which may cause units to reset at seemingly random intervals.
PoE specification standards are:
•
IEEE 802.3-2008 provides up to 10W of DC power.
•
IEEE 802.3af provides up to 15.4W of DC power. Only 12.95W is assured to be available at the device.
•
IEEE 802.3at, known as PoE+ or PoE plus, provides up to 32W of DC. Only 25.5W is assured to be available at the device.
Class 0 devices comply with the PoE standard that provides up to 15.4W of DC power for each port. The real power draw is between
5-10W.
Class 3 devices comply with IEEE 802.3-2008 that provides up to 10W of DC power.
S
WITCH
S
PEED
The E4200 encoder will produce up to 800Mb/s of data. Therefore, 10 encoders will require 10 x 800MB/s = 8Gbps. E4200/D4200
requires the switch to be GbE. E4200/D4200 technology is used to transmit visually lossless 8~10:1 compressed video up to 4K along
with other AV signals such as audio, USB, and control signals. For video alone, this means raw bandwidth of up to 800Mbps for 4K.
