| Displaying 1 - 20 of 42 matching stories. |
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| 08.20.2008 |
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Time Warner Cable Carolina: A Talk with Regional VP Engineering Carl Newberry
What made Time Warner Cable Carolina Region standout as this year's System of the Year? The cover story in the July issue of...
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| 09.01.2007 |
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Broadband: What's Your CNR?
"How many of you have measured the carrier-to-noise ratio (CNR) of downstream digitally modulated signals on your system?" When I ask that question at SCTE seminars, rarely do more than a couple attendees raise their hands. Most of the time, no one...
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| 06.01.2007 |
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Digital Transmission, Part 1
Cable modem termination systems (CMTSs) can report a variety of operating parameters to the end user. For example, CMTSs that use Broadcom BCM3137, BCM3138, or BCM3140 or Texas Instruments TNETC4522 series upstream burst receivers can provide an "upstream...
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| 03.01.2007 |
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Shotgun or Rifle
Each season has its jobs. And whether it's winterizing the house, cleaning out the garage or shed in the spring, packing up for summer vacation, or getting ready for the opening of hunting season in the fall, these tasks all have their own checklists. A...
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| 02.21.2007 |
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Keeping Crabgrass Out of Your Network
It's hard enough to keep problems in your own network from spreading like crabgrass, but operators also need to keep the neighbors' crabgrass from creeping in as well. Time Warner Cable's Thomas Staniec, vice president of transport network engineering at...
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| 01.01.2007 |
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Broadband: Modulation Error Ratio
Awhile back I went target shooting with a friend. While at the range, it occurred to me that what is also known as plinking is a little like modulation error ratio (MER) used to characterize, say, the 64- and 256-QAM (quadrature amplitude modulation)...
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| 01.01.2007 |
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Telephony: Cleanup Time
Last year, many operators achieved respectable penetrations levels for public switched telephone network (PSTN) quality plain old telephone service (POTS) and this year will be looking at new offerings to continue expanding their telephony base. Converged...
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| 12.15.2006 |
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Kevin Oliver
Kevin Oliver is vice president of marketing, Cable Networks, Communications Test and Measurement, for JDSU. What products or services are you developing over the next few years, and why are they important to cable? As today’s cable operators continue to...
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| 10.01.2006 |
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The Power of QAM
If you have an analog TV channel whose visual carrier level is 0 dBmV and a 6 MHz wide 64-QAM (quadrature amplitude modulation) signal whose digital channel power is 0 dBmV, which one has more power? Let’s look at this subject more closely and see what...
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| 09.01.2006 |
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Broadband: One for the X-Files
I recently heard from a regular reader about an interesting and somewhat unusual problem. Here's the background. A defective downstream laser transmitter that serves three nodes was found to be causing degraded bit error rate (BER) in the downstream digitally...
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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...
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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...
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| 06.13.2006 |
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Pipeline Profile:
SCTE member since 2005 Title: Electrical Engineer, Bresnan Communications Broadband Background: In the 17 years Mesavage has worked in the broadband industry, he has held engineering positions at companies including C-COR, General Instrument and Motorola BCS...
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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...
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| 06.01.2006 |
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Common Path Distortion
Common path distortion (CPD) is a return path impairment that can have a severe effect on return path signal quality. Although it can take on many forms and degrees of severity, it has a very distinctive signature. It is characterized by a significant rise in...
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| 06.01.2006 |
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Digital Troubleshooting, Part 1
Digitally modulated signals are used to transport high-speed data, video and voice on cable networks. These signals are subject to a variety of impairments that can seriously impact the quality and reliability of the services being provided. More often than...
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| 06.01.2006 |
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Mailbag: Gear Horror
It’s hard to be a field meter: long days in every sort of weather, no vacation, hair-raising near misses, occasionally a useful life cut tragically short, and perhaps even a miraculous resurrection. We asked for readers’ stories of sad fates for...
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| 06.01.2006 |
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Teaching Cable Dawgs New Tricks
All-digital simulcast (ADS) is a hot topic these days. Your cable company is either designing, building, or already rolling out ADS cable services in your systems. Is it the beginning of the end for analog? Some think so. One thing is certain: Now is the time...
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| 05.03.2006 |
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Proxy Server: Other Trusted Sources
Pick a Softswitch US Telecom is hosting a webinar tomorrow (May 4) on how to pick the best softswitch for your company. Register at...
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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...
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