Tait and Digital Mobile Radio (DMR): An overview
Trevor Laughton, Chief Technology Officer at Tait Radio Communications, will be discussing digital standards such as P25 and Tetra at this year's IWCE in Las Vegas between 1.00 and 2.30 on 19 March 2009. Here he writes of the Tait strategy for DMR and gives prospective digital buyers some food for thought.
Tait and DMR
Tait始终追求开放标准和开放的接口，以利益有兴趣保护其无线电解决方案的价值和灵活性。对于我们而言，这并不恰到是商业思想的做法，对于纳税人的金钱在股权的公用事业合作，市政交通服务提供者和公共安全机构，这是伦理所做的。
我们是在20世纪90年代建立MPT 1327标准的主要贡献者，并拥有现在询问“我们如何从MPT转移到DMR的客户？”
DMR的强度是，它是一个开放标准，具有商定和出版标准的传统和集群无线电操作。通过TAIT和其他制造商提供这项技术，买家可以避免被锁定为专有的解决方案。
由于集群DMR旨在取代MPT 1327个中继系统和TAIT，因此我们致力于DMR而不是较低的特色和目前不兼容的DPMR标准。这不仅仅是因为我们希望确保自己的客户的迁移是平滑的，而是因为Tait相信DMR标准在6.25 kHz FDMA产品中具有许多优势。
To predict the future, try to understand the past
作为MPT 1327的替代品，衡量DMR层III（集群）标准的可能成功要求我们查看世界各地非常成功的MPT 1327。该集群标准已开放：导致竞争，价值和创新。它还证明是非常可扩展的 - 从一个网站到960 - 并且可以满足最大组织的领土覆盖需求。它处理语音和数据，以及捷站等制造商继续在这一领域创新。也许这解释了标准的成功和事实上，对于世界各地的许多组织，MPT 1327将仍然是未来几年的稳定选择。顺便说一下，MPT 1327设备中的数字处理，以及迁移到集群DMR解决方案中的能力，将术语模拟和数字标准的含义模糊到含义之间的边界。
一些制造商想挥动魔杖在穿越s the world and neatly and quickly magic away analogue systems. Industry history shows us that the world implements new radio technology in a more "patchy" way. There are two lessons for buyers from this messy evolution model. First don't be drawn into the "the analogue is dead" hype: to paraphrase Mark Twain, "rumours of its death have been greatly exaggerated." Second, ongoing innovation, backwards compatibility and smooth migrations will continue to be the names of the game.
There are several business gains of going digital including spectrum efficiency, digital audio clarity and data integration. But there are many ways to "skin the digital cat." At IWCE 2009, I'll be talking about rival standards in the digital domain.
以下是考虑DMR时的三个当前考虑因素
1.不相容内置！
Although there's only one letter difference in the acronym, the reality is that the equipment using the various 6.25 kHz FDMA* standards will not be interoperable with DMR equipment which uses TDMA+. Only one letter difference in the acronym, but a world of difference in everything from power consumption to the amount of infrastructure and equipment needed to guarantee coverage. With such uncertainty hanging over the evolving technology, caution will be the name of the game.
American newspaperman H.L. Mencken said: "for every complex problem, there is an answer that is clear, simple and wrong." The relevance to today's DMR choices will be the importance to take a clear-eyed view, make a rounded assessment based on a combination of complex factors in play.
2.匆忙行动：休闲悔改
该行业处于助焊剂，复杂的无线电装置不像蓝光球员;当它可能是悬崖的边缘时，没有荣誉是领先的领先优势。通过技术成熟，通常更好地让灰尘定位 - 价格下降，技术及其可靠性和互操作性可能会变得更加验证。有时我认为DMR可以努力不要迅速迁移！
但是，如果你不能等待并且需要开始计划，因为FCC制定的窄带改变到2013年的12.5 kHz环境，但是嗯，首先检查你受到要求的影响：例如，800和900 MHz频段不会受到影响。其次，不要排除MPT 1327，今天提供12.5 kHz（以及经过验证的价值和特征），达到6.25 kHz等效的途径。
如果您的遗留系统必须在未来12-18个月内更换，那么该做什么？嗯，在考虑今天的哪个数字产品将是最佳选择之前，可能会考虑哪个合作伙伴可以与您努力，以尽量减少任何“叉车”批发变革的业务中断。没有产品是岛屿。它都非常好，具有DMR产品，但如果您无法配置，安装，从旧系统中迁移并无缝测试新系统，那么实现将远离光滑。
3. Open interfaces, open standards and an open philosophy
Open interfaces allow customisation, so a solution can be adapted to an organisation's very specific need thus becoming the right fit. The Tait way of delivering trunked DMR will follow this "ethos of openness." And it's not just the openness of the DMR interface which will enable this. Our P25 products and the latest TM8000 mobiles were engineered with flexibility in mind, for example, providing enough space for options boards and comprehensive developer kits to support those devising a modification. By providing these features and designing based on this open philosophy, Tait radios became a favourite with system integrators and experts in the field who were external to Tait, but who could adapt the product and embed it into their own solution.
Some manufacturers might be content with a One Size Fits All DMR radio. The Tait way will be to offer a set of DMR products that can be adapted, modified and adjusted so it can become the right fit. As well as being customisable, to earn the blue circle on the front, Tait DMR products will be reliable. This reliability comes from customer-lead design, rigorous testing, design / manufacturing excellence and over 4,000 man-years of Tait-accumulated RF engineering expertise.
有一种说法说：“智慧是奖励的奖励。”嗯，Tait一直在倾听客户40年，我们可以帮助我们通过未来的波涛汹涌的水域来指导您。听力肯定会在未来40年内继续，我们期待与您谈论您的DMR需求。
*Frequency Division Multiple Access +Time Division Multiple Access