By Ron Hranac — Unless you’re involved with the use of specialized test equipment such as VNAs, S-parameters are likely something you’ve never heard of. At least, perhaps, until recently. In the world of full duplex (FDX) DOCSIS, the S-parameter “S11” is commonly used when discussing an FDX node’s echo cancellation operation.
Read MoreBy Ron Hranac — A surprising amount of behind-the-scenes interaction occurs between Data-Over-Cable Interface Service Specifications (DOCSIS®) cable modems and the cable modem termination system (CMTS). One important process is called station maintenance.
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By Ron Hranac — Two RF power-related parameters that can cause confusion are total power (also called total composite power) and power spectral density (PSD). Grab a cup of coffee and a scientific calculator.
Read MoreBy Ron Hranac — Let’s first look at the concept of equalization from the perspective of a cable distribution network. As you know, in a given length of coaxial cable higher frequencies are attenuated more than lower frequencies.
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By Ron Hranac — Cable operators for decades have dealt with the monitoring and measurement of signal leakage field strength. But just what is field strength?
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By Ron Hranac — In this second installment of a three-part article, the discussion about measurement of downstream RF signal levels continues.
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By Ron Hranac — Earlier this year SCTE·ISBE’s Rocky Mountain Chapter instituted a new program called Last Thursday, a monthly meet-up on the last Thursday of every month. The meetings are open to all chapter members, guests, and those interested in SCTE·ISBE, and provide a fun and social way to participate with the chapter.
Read MoreBy Ron Hranac — Making accurate signal level measurements is not quite as simple as it might seem at first glance. This installment concludes the discussion about various factors that can affect those measurements, and includes tips to ensure more accurate and reliable results.
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By Ron Hranac – In this second installment of a three-part article, the discussion about measurement of downstream RF signal levels continues. Signal Source Output Signal Level Accuracy — The purpose of measuring a signal source’s output RF signal level or power is to confirm that it meets a desired value or perhaps some other specified value such as the manufacturer’s published spec.
Read MoreBy Ron Hranac – Optimum cable network downstream performance requires that radio frequency (RF) signal levels be measured and set correctly. RF signal levels affect nearly every part of a cable network’s operation: headend/hub site, optical fiber links, coax distribution, subscriber drops, and customer premises equipment (CPE).
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