Broadband: Total Power, Part 2</h1> <article> <h1>Broadband: Total Power, Part 2</h1> <p>Sat, 1 Nov 2008 0:00:00 EDT</p> 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 - 10log(n) where x is the CNR, and n is the number of... </article> <article> <h1>Broadband: Total Power</h1> <p>Wed, 1 Oct 2008 0:00:00 EDT</p> 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 performance parameters for the cable modem... </article> <article> <h1>Broadband: How Fast Is RF?</h1> <p>Mon, 1 Sep 2008 0:00:00 EDT</p> 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 signal, too, existing in the higher frequency or... </article> <article> <h1>Broadband: Big Numbers, Small Numbers</h1> <p>Fri, 1 Jun 2007 0:00:00 EDT</p> 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 small numbers can be. Consider the number 1,000,000... </article> <article> <h1>Digital Transmission, Part 1</h1> <p>Fri, 1 Jun 2007 0:00:00 EDT</p> Find out exactly what the CMTS upstream SNR estimate is - and what it is not.... </article> <article> <h1>HDMI Is Here</h1> <p>Tue, 1 May 2007 0:00:00 EDT</p> 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.... </article> <article> <h1>The Next-Generation Field Tech</h1> <p>Wed, 1 Nov 2006 0:00:00 EST</p> As services become more advanced, so too must the technicians who enable them.... </article> <article> <h1>Letters to the Editor</h1> <p>Tue, 19 Sep 2006 0:00:00 EDT</p> Last week's Soapbox question on whether techs need laptop computers apparently struck a chord. Here follow two of the replies we received.... </article> <article> <h1>Unsolicited Grant Service (UGS) Turns Mountain Cablevision into a Voice Lighthouse</h1> <p>Wed, 16 Aug 2006 0:00:00 EDT</p> 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 cable telephony systems relied heavily on what... </article> <article> <h1>Self-Terminating Taps and Micro-Reflections</h1> <p>Sat, 1 Jul 2006 0:00:00 EDT</p> 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... </article> </main></body></html>