HDBaseT for Ultra HD Video Displays and Digital Signage
2016년 6월 9일 / General
So your customer has decided to deploy HDBaseT for ultra high definition video displays and digital signage. If you're already experienced in deploying a copper cabling infrastructure for IP-based Ethernet applications like voice and data, you have little to worry about.
But it's still important to know the basics and best practices required for HDBaseT performance and error-free video transmission, and what's required when it comes to testing.
The Difference is in the Protocol
Promoted and advanced by the HDBaseT Alliance, HDBaseT is a consumer electronic and commercial connectivity standard for transmitting uncompressed HD video, audio, 100BaseT Ethernet data, power (through power over HDBaseT) and various control signals over common category copper cabling and RJ45 connectivity up to 100 meters. Sound familiar?
Although the cabling infrastructure for HDBaseT may look the same as Ethernet, it is actually based on a different protocol. While both use pulse amplitude modulation (PAM) coding technology, and HDBaseT does support an Ethernet channel, HDBaseT is not packet based data that uses Internet protocol (IP).
HDBaseT specific equipment--everything from transmitters and receivers, to projectors and displays--is certified by the HDBaseT Alliance to ensure interoperability within an HDBaseT system. 이더넷 네트워크에 연결된 HDBaseT 장치는 단지 이더넷 기능만을 수행할 뿐 소리/영상을 전송하지 않습니다.
Some Things Stay the Same
Since HDBaseT runs over the same cabling infrastructure as the LAN, it is deployed using the same best practices for cable handling and termination--everything from maintaining pair twist and not exceeding the bend radius to staying away from power sources. And just like the LAN, distance matters. HDBaseT also runs over 100 m channels.
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Something else that stays the same is the fact that cable quality matters--the better the cable, the better the signal. Just like Ethernet, a higher quality cable will maintain the HDBaseT signal better over longer distances. And just like Ethernet, shielded cable is recommended for HDBaseT systems deployed in noisy interference-prone environments.
또 다른 유사성은 에어리언 크로스톡입니다. HDBaseT에 카테고리 5e 또는 카테고리 6 케이블을 사용할 수 있기는 하지만, 이 케이블들에는 에어리언 크로스톡 사양이 없습니다. 이것은 개별 HDBaseT 채널에 대해서는 문제가 되지 않습니다. But just like bundles of cables transmitting 10GBASE-T, bundles of cables transmitting HDBaseT can be adversely impacted by alien crosstalk. 그것이 바로 설치 시 동일한 경로에서 다수의 HDBaseT 케이블을 지원할 수 있도록 설계된 카테고리 6A의 사용을 권장하는 이유입니다.
You Still Need to Test It
While there are specific tools for testing the HDBaseT application itself to ensure proper resolution, frame rate and other video specifications, the cabling infrastructure also needs to be tested--just like when deploying an IP-based LAN.
사실, HDBaseT Alliance는 구축되는 케이블 유형에 상관없이 적절한 TIA 표준을 준수하는지 테스트되어야 한다고 명확하게 명시하고 있습니다. That's right--there is really nothing different about testing cables for HDBaseT versus Ethernet. If Category 6A cable is deployed for an HDBaseT system, it must be certified to meet the TIA Category 6A standard, including alien crosstalk testing--especially if you want to receive the manufacturer's warranty.
In other words, go ahead and use your DSX-5000 CableAnalyzer™ for an HDBaseT deployment. It will do exactly what you need it to do.