- 1). Make your audience aware that PDH is an early model of telecommunications, really a "first generation" response to the demands placed on the telecommunications industry. It existed before the late 1990s cell phone revolution. When defining this phrase, always make sure that your audience understands that PDH is going out of existence. It was an early 1990s way to deal with increased telecommunications traffic worldwide. But with the increasing use of cellular transmissions, new, faster and easier methods needed to be developed, hence the SDH.
- 2). Stress the idea of a-synchronicity and the problems associated with it. This should remain the main, central point. The big problem with PDH is/was that it could only synchronize American telecommunications. When interfacing with European or Asian networks, it needed to adjust (or rather, they needed to adjust to it), meaning the signal needed additional data attached to it so the other systems could read and decode it properly. This meant extra expense and work. In addition, it also meant a far more labor intensive system, one that required a large number of technicians standing by at all times. Since banks and other businesses were converting to telecommunications for doing business, accurate and synchronous moment of data needed to be stressed above all.
- 3). Contrast PDH to SDH. If your audience needs to know about current telecommunications technologies, learning about PDH by itself will do them no good. Learning about PDH makes sense only when attached to an understanding of SDH. SDH does not need to make any adjustments regardless of who it is connecting to. This is the central core difference. More cell phones and an explosion of telecommunications technology made demands on the industry to find easier-to-use hardware that was faster and less complex. SDH was developed precisely to remedy the defects of PDH. In addition, SDH can hold more data and deliver it quickly.
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