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Power Over HDBaseT: What Is It, Why Use It?
Power Over HDBaseT: What Is It, Why Use It?

POH has its advantages: it is simpler, powerful and requires less installation effort. Check out the benefits for using power over HDBaseT.
May 01, 2013 | by Daniel Dern
As target locations for video displays and other devices farther away from AC wall outlets, A/V installers face the challenges of providing power in an affordable, convenient, and safe way.
For example, for digital signage and wayfinding displays in airports and hotels, video displays in medical facilities, even, for consumers, displays in kitchens and other areas of the house.
IT and facilities have been able to solve the power problem for many wireless LAN access points, digital security cameras, and other networked devices thanks to 802.3af Power over Ethernet (PoE) and its higher-power sibling 802.3at Power over Ethernet Plus (PoE+), which conveys power over the same CAT5 or CAT6 LAN cabling used to carry data, eliminating the need to provide standard AC power.
A/V faces many of the same power-related concerns and constraints — and Power over HDBaseT (POH) promises to similarly resolve them, in many situations, bringing PoE-type solutions to the A/V world.
What is HDBaseT?
HDBaseT technology is a digital connectivity solution supported by the HDBaseT Alliance, which was started in 2010 by LG Electronics, Samsung Electronics, Sony Pictures Entertainment and Valens Semiconductor.
HDBaseT technology is a digital connectivity solution supported by the HDBaseT Alliance, which was started in 2010 by LG Electronics, Samsung Electronics, Sony Pictures Entertainment and Valens Semiconductor.
According to the HDAlliance website, HDBaseT can, as its “5Play” feature set, carry:
- Uncompressed HD digital video, including full HD/3D and 2K/4K resolution (up to 10.2 Gbps)
- All standard audio formats
- 100BaseT Ethernet
- Control signals including RS232/USB and IR
- Up to 100 watts of power-over-cable
all through a single 100m/328ft CAT5e/6 cable with RJ45 connectors.
The signal combining alone is significant, reducing the cable clutter needed to connect a single video device, just like digital security cameras need only one Ethernet connection where their analog CCTV (Closed-Circuit TV) predecessors needed separate cables for video, audio, control signals and power.
In terms of power, according to Micha Risling, HDBaseT Alliance marketing chair, “POH, the Power over HDBaseT standard, is based on the IEEE 802.3at standard with the appropriate modifications to enable safe delivery of up to 100 watts over the four-pairs of the Ethernet cable.”
POH Availability: Still Ramping Up
Some products using HDBaseT are available — in particular, professional video distributors, HDMI/HDBaseT converters and devices like Microsemi’s PowerDsine midspans. However, since POH is relatively new — it was formally added to the 5Play feature set in September of 2011 — many POH products are still in the pipeline, according to Risling.
Some products using HDBaseT are available — in particular, professional video distributors, HDMI/HDBaseT converters and devices like Microsemi’s PowerDsine midspans. However, since POH is relatively new — it was formally added to the 5Play feature set in September of 2011 — many POH products are still in the pipeline, according to Risling.
As with PoE, key vendors are working to jump-start POH usage by offering Power Supply Equipment (PSE), including “midspans” (a.k.a. injectors) that put power into an HDBaseT cable and “splitters” that extract the power from the cable to go to the power port. Next will be powered devices — products that can extract the power from POH internally and PSE-enabled products.
Automação: Brasil entre os países com maior potencial Fonte: Revista Home Theater
Automação: Brasil entre os países com maior potencial
Estudo mostra consumidor brasileiro como o terceiro mais interessado em sistemas de controle da residênciaO mundo da automação residencial conquista mais brasileiros a cada dia. Sem contar o número crescente de empresas - grandes, médias e pequenas - que atuam no setor, o próprio interesse dos consumidores está aumentando sensivelmente. Estudo divulgado pela Motorola Mobility na semana passada coloca o consumidor brasileiro como o terceiro mais interessado em sistemas de automação no mundo, atrás apenas de mexicanos e chineses. A pesquisa, realizada com 9.500 pessoas em 17 países, mostra que um terço dos entrevistados se interessa por serviços de gerenciamento remoto da residência, monitoramento de segurança, iluminação e aquecimento automatizados.O crescimento está intimamente ligado à popularização de tablets e smartphones nos últimos anos. Esses aparelhos são usados hoje para várias funções, entre elas a de controle remoto da residência. Mais recentemente, vêm sendo usados como "segunda tela", fenômeno identificado pelos especialistas como um novo comportamento dos telespectadores, que acessam as redes sociais enquanto assistem a programas de TV.Já existem também no mercado filmes em Blu-ray lançados em conjunto com aplicativos gratuitos, que expandem a experiência do usuário, oferecendo na tela do tablet ou smartphone informações sobre o conteúdo que está sendo assistido. E as próprias emissoras começam a pensar nos portáteis como uma forma de conquistar audiência e dar mais valor às transmissões. Globo e Cultura, por exemplo, já lançaram aplicativos com essa finalidade.
O estudo da Motorola aponta que a convergência multitelas já é adotada por 62% dos entrevistados no Brasil, que assistem conteúdo em tablets, smartphones ou desktops. Filmes são o conteúdo mais acessado, por 43% dos brasileiros. Em segundo lugar, estão as notícias, com 36%, seguidas pelas novelas (34%).
Fonte: Revista Home Theater & Casa Digital
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