| Displaying 1 - 20 of 33 matching stories. |
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| 07.08.2011 |
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NCTA to FCC: Kill AllVid
National Cable & Telecommunications Association (NCTA) President Michael Powell sent a letter to Federal Communications Commission (FCC) Chairman Julius Genachowski, itemizing reasons why AllVid is unnecessary. AllVid is an FCC initiative to stimulate...
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| 05.20.2011 |
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Ways CMAP Will Help Transition to All-IP
One of the primary purposes of Converged Multiservice Access Platform (CMAP) is to squeeze more technology into crowded headends. Initiated by Comcast, CMAP combines cable modem termination system (CMTS) and edge QAM functions. (For more, click here and...
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| 02.24.2010 |
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Operators Need Harry Potter Kids
For the lunch speech at yesterday’s NCTC Winter Educational Conference, Steve Collier, VP of business development with Milsoft Utility Solutions, entertained and frightened attendees with his assessment of where communications technology is going. The...
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| 02.22.2010 |
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Comcast Subs Can Track Internet Usage
Comcast has begun offering Internet usage meters to customers across its footprint. In December 2009, Comcast offered Internet usage meters to some of its customers in its Portland, OR, system on a trial basis. That trial was expanded to Seattle in January...
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| 02.10.2010 |
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What’s in HDMI 1.4?
On the program of last week’s Over the Top (OTT) Conference in San Jose was the newly enhanced high definition multimedia interface (HDMI) specification. First announced at the Consumer Electronics Show in 2003, HDMI has since been adopted by more than...
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| 11.01.2008 |
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Broadband: Total Power, Part 2
If the goal is to combine carrier-to-noise ratios (CNRs), we have to tweak the formulas discussed in last month's column slightly. For example, when combining multiple identical CNRs, the first formula's plus sign is changed to a minus sign. CNRt = x ...
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| 10.01.2008 |
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Broadband: Total Power
The DOCSIS Radio Frequency Interface Specification includes a summary of assumed downstream and upstream RF channel transmission characteristics, parameters that effectively define what a DOCSIS-compliant cable network is. That same document includes other...
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| 09.01.2008 |
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Broadband: How Fast Is RF?
Maybe a better question is, "What's the speed of an electromagnetic signal in a vacuum?" After all, what we call RF refers to signals in the lower frequency or longer wavelength part of the electromagnetic spectrum. Light is an electromagnetic...
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| 06.01.2007 |
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Broadband: Big Numbers, Small Numbers
Ours is a world of numbers, and in cable we tend to use a lot of really big and really small numbers. Fortunately, there are several ways to simplify how we describe those numbers, which I'll get to shortly. In reality, it's hard to grasp just how big or...
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| 06.01.2007 |
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Digital Transmission, Part 1
Find out exactly what the CMTS upstream SNR estimate is - and what it is not....
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| 05.01.2007 |
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HDMI Is Here
High definition multimedia interface (HDMI) is here, largely among high-end consumers. Here's a rundown on what HDMI is, how it relates to high-bandwidth digital content protection (HDCP), where the potential bugs are, and how to fix them....
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| 11.01.2006 |
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The Next-Generation Field Tech
As services become more advanced, so
too must the technicians who enable them....
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| 09.19.2006 |
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Letters to the Editor
Last week's Soapbox question on whether techs need laptop computers apparently struck a chord. Here follow two of the replies we received....
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| 08.16.2006 |
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Unsolicited Grant Service (UGS) Turns Mountain Cablevision into a Voice Lighthouse
Unsolicited Grant Service (UGS) Turns Mountain Cablevision into a Voice Lighthouse Cable telephony looks great on a white board; sounds stunning at a shareholder meeting; is a fine foundation for clever TV advertising - and is a bear to do right. The earliest...
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| 07.01.2006 |
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Self-Terminating Taps and Micro-Reflections
A Communications Technology reader recently sent me the following via email. "In your article `Linear Distortions, Part 1' (July 2005, www.ct-magazine.com/archives/ct/0705/0705_lineardistortions.htm), you mention the use of self-terminating taps as a possible ca...
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| 07.01.2006 |
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Troubleshooting Digitally Modulated Signals, Part 2
Digitally modulated signals are a fact of life in the modern cable system, and keeping those signals healthy requires different equipment and knowledge than analog does. Here follows Part 2 of Ron Hranac's Expo workshop on troubleshooting digitally modulated signals....
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| 06.01.2006 |
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More on Cable Modem Upstream Signal Levels
A couple weeks after I wrote last month’s column, Cisco’s John Downey took a look at the manuscript and suggested a few things to add to what was said. Since the May issue was well on its way through the editing and production process by then—and CT’s editors give me a limited amount of space each month—I suggested that we collaborate on a second installment to cover the additional material. Here ’tis....
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| 06.01.2006 |
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Common Path Distortion
This distinctive but widely misunderstood bug can raise Cain with the return path. Here's what it is, what causes it and how to minimize it....
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| 06.01.2006 |
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Digital Troubleshooting, Part 1
The move to digital entails more than just new headend gear and CPE. You also need digital-specific test equipment to keep things running correctly....
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| 05.01.2006 |
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Cable Modem Upstream Signal Levels
One of the easiest and more accurate ways to measure the amplitude of upstream digitally modulated signals from cable modems is to use a spectrum analyzer in zero span mode. Mark Millet and I coauthored an article about this in the December 2000 issue of Communications Technology: "Upstream Power Measurements: Watts up Doc?" (www.ct-magazine.com/archives/ct/1200/064_upstream.htm)....
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