HDMI over IP for school

[SteveP150]

Hi. We will be redoing our school building. We have cat cable in every classroom. We want to transfer hdmi video signals to the classrooms using our existing cat cable. We have decided to invest in an hdmi over ip solution. There are several brands on the market such as Atlona Omnistream, Gefen, Hall Research, Key digital, ZeeVee, etc.

Is anyone familiar with these brands and technologies? I want to understand the differences and prices between them. Any help will be much appreciated.

[mixo]

I tried an alltronics send/receive modules with one cat5e/6 but I could not get it to work..going back next week..network is brand new cat6a.

 

mixo

Edited October 15, 2016 by mixo

[groovem]

You need two runs of Cat 5/6 preferably 6, and the data sockets have to be terminated in B configuration. In B configuration the orange and green pairs are swapped in position on the data socket from A configuration.

[mixo]

i think these are australia standard and and terminated in "A" config..I'll see if i can find some "b" type..I ran a 20 mtr cable direct but till nothing..

 

mixo

[bucket23]

On 15/10/2016 at 7:11 PM, mixo said:

I tried an alltronics send/receive modules with one cat5e/6 but I could not get it to work..going back next week..network is brand new cat6a.

 

mixo

Is it an HDMI to CATx extender or does it convert it to IP.

If it's an HDMI to CATx extender then there are length issues. You may only get 10m-40m. If it's IP then you get what the xBase-T is (usually 100m).

I've got a HDMI to CATx at home and I get about 30m (CAT6A and a patch panel in between). I still have the issue where it won't do 1080i, just 720p. If I reduce the length then it works at full speed.

Mine don't require crossover cables, so it won't matter if it's A or B, infact nothing does unless you are needing a crossover cable and even then you don't need one or the other, you need one of each.

 

[groovem]

21 hours ago, mixo said:

i think these are australia standard and and terminated in "A" config..I'll see if i can find some "b" type..I ran a 20 mtr cable direct but till nothing..

 

mixo

Normally the configuration is on the back of the data socket where you connect the cable. There should be colour coding with the letters A and B.

[pgdownload]

On 15/10/2016 at 8:29 AM, SteveP150 said:

Hi. We will be redoing our school building. We have cat cable in every classroom. We want to transfer hdmi video signals to the classrooms using our existing cat cable. We have decided to invest in an hdmi over ip solution. There are several brands on the market such as Atlona Omnistream, Gefen, Hall Research, Key digital, ZeeVee, etc.

Is anyone familiar with these brands and technologies? I want to understand the differences and prices between them. Any help will be much appreciated.

Out of interest, what is the intended application of HDMI broadcasts? Class rooms can obviously get local internet or video content over CAT5. What is the proposed benefit of being able to broadcast TV/Recordings to each class room from a remote location?

Regards

Peter Gillespie

[SteveP150]

This is private school. We want to show special study movies. I will test this equipment https://bzbexpress.com/OmniStream-Atlona-encoder-decoder-av-ip-Omni-Stream/ on next week. 

[shogun2]

There's a large range of brands available now. Over the last two years we have commissioned systems using the Thunder and Lightning systems from Imag Systems. (Australian company) These use the SDVoE chipsets, 

Also looked at Extron, Q-Sys and many others. 

I am currently commissioning a system using Biamp TesiraLux using the AVB protocol, 30 transmitters and receivers in each room, total around 250+ boxes. 

Saw today some interesting boxes from Aurora, again using the SDVoE chipset.

Another less expensive option would be Bluestream, another very successful Australian manufacturer.

Many of the boxes have distribution and/or switching built in. 

These all require Cat6. Some require shielded. 

Cable installation needs to be d excellent, otherwise you will suffer issues. 

Network design is critical, as it's switch selection. 

It's not a simple job to design and implement a system. 

Edited May 19, 2020 by shogun2

[PonyTail]

I recently purchased an A3148 HDMI Transmitter over IP and two A3149 Receivers. All are PoE equiped and also included plug-packs if PoE is not available, from Altronics.

 

Here is a brief overview:

"Converts a HDMI signal into a H.264 encoded stream (maximum 1080p @ 60Hz) and sends it over Cat5e/6 cable using internet protocol (IP) over a distance of 120 metres. The advantage of this method is a reduced network load without sacrificing signal quality. It also allows for data to be streamed over Wi-Fi. 

These transmitters and receivers are very flexible, allowing for various system configurations including one to one, one to many, many to one and many to many modes. Up to 64 transmitters may be used and a total maximum of 256 transmitters & receivers per system. Each device in the system can be individually addressed with support for IGMP and DHCP automatic addressing. 

Importantly, PoE (802.3af) has also been included, allowing for the transmitter and receiver to be powered directly from a PoE equipped switch, eliminating the need for individual plugpacks. It also allows an infra-red signal path back to the source equipment for remote control at the receiver location. 

These units are ideally suited for multi source, multi screen environments such as clubs, pubs, convention centres, venues etc. 

HDCP compliant. "

 

Don't know about the 120m claimed range as I thought Cat 6 was limited to 100m.

 

I am using these to send my CCTV output to a rear room and a workshop. As the source is derived from H.264 cameras and an XVR, there is a slight quality loss which may not be there if fed from another source.
 

[shogun2]

H.264 can be problematic due to the encoding/decoding delay, especially if you need close to real time display (like showing mouse movement). There is also the quality loss to contend with.