Blog

There are 6 blogs written by Tom Williams.

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Pinpointing Signal Leakage and Noise Ingress Demo

February 15, 2018

The CableLabs Proactive Network Maintenance (PNM) effort develops technologies and systems to proactively detect network problems before they impact the customer. In essence, our revolutionary technology turns every cable modem into a troubleshooting device, transferring that information to cable operators. Deploying PNM technologies results in faster and more accurate diagnoses of problems, faster repairs and […]

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Getting Rid of a Big Communications Tax on OFDM Transmissions

December 20, 2017

You can find the background information for this article in the post “Sharing Bandwidth: Cyclic Prefix Elimination.”  Most wireless transmissions use a modulation technology called OFDM (orthogonal frequency-division multiplexing). This method was invented by Saltzburg and Chen at Bell Labs in the 1960s, but was not widely commercialized until the 1990s when faster signal processing […]

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Sharing Bandwidth: Cyclic Prefix Elimination

December 20, 2017

Unfortunately, there is only so much over-the-air wireless bandwidth, and it must be shared between a lot of folks. And the situation is not getting any better.  While you can usually run another wire or fiber optic cable between two locations to get more bandwidth, if you have a wireless application you must share this […]

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The Analog Monkey on Our Backs: Wrong-Thinking about Data over Cable

March 10, 2016

We inherit a lot of things from the past – not all of them good.  When the telephone was invented by Elisha Grey, it evolved from wired telegraph lines. This was a natural evolution since the telegraph lines already existed and were proven, whereas radio technology was still in its infancy.   When television was first […]

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The Evolution of DOCSIS Proactive Network Maintenance (PNM)

December 10, 2014

All cable operators would like to find and fix problems quickly, hopefully before a customer experiences a problem. Long ago, before the advent of DOCSIS, the cable plant was one-way downstream and operators waited for the customer to inform them that something was not working as intended, usually with a phone call. With DOCSIS and […]

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Proactive Network Maintenance (PNM): Smarter Technology for Smarter Maintenance

May 19, 2014

We have always wanted more information about our world: Where is our next meal coming from; what’s the weather like; are my kids OK; did my team win?  Past information delivery systems, such as the telegraph, the telephone, and broadcast television, have all been supplemented with the Internet.  At a basic level, the Internet exists, […]

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