DigitaLinx IPEX2100 Series Manual de instalación rápida - Página 10
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Gigabit Switch Features
A high quality, managed Level 2 gigabit switch with a high bandwidth backplane should be used in the installation,
preferably with PoE support. The two primary features to look for in the switch are support for multicast and
support for IGMP querier / snooping, which are required technologies for stable multicast video signals.
Be sure to verify the PoE gigabit switch can provide 15.4 watts to each output under full load. Some switches
support 15.4 watts per output but do not have enough available power under full load. For a 24 port switch, it
should be able to provide about 370 watts to the LAN ports (24 x 15.4 = 369.6) plus power for the switch.
Gigabit Switch Size(s)
When calculating the size of switch needed, the following devices need to be considered:
1.
Number of sources
2.
Number of displays
3.
IPEXCB
4.
Wireless access point for iPad app or Windows app (optional)
5.
Hardwire port for Windows app (optional)
If the installation requires 14 sources and 10 displays, a 24 port switch will not have enough ports for the installation,
because there are no open ports for the IPEXCB.
System Bandwidth
30 Mbps should be considered when calculating the bandwidth for the highest quality video setting for each
streaming encoder. This value covers the maximum quality 30Mbps encoded stream plus packet overhead. Ten
1080p sources using the highest quality video setting will be using approximately 300 Mbps of effective bandwidth
on the backplane. The IPEX2101 series encoder supports Constant Bit Rate (CBR) and Variable Bit Rate (VBR)
settings.
Gigabit Switch Expansion
Quite often, a switch will not have enough ports for a complete installation. There are two methods to connect
switches together to expand the number of ports: cascading and stacking.
Cascading refers to connecting the copper LAN port from one switch to another. This is a low cost method of
expanding the number of ports, but the bandwidth is limited to the speed of the network port, which will become
an issue if the bandwidth of all the encoders exceeds the network ports speed.
Stacking refers to connecting the fiber SFP port from one switch to another. This is a slightly more expensive option,
but it does not interfere with the number of network ports needed for the installation. The SFP port on modern
switches will often support 10 Gbps pass through.
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