Broadband Cable Access Networks. The HFC Plant by David Large

By David Large

This e-book specializes in broadband distribution and platforms structure and concentrates on sensible techniques that might permit the reader to do their very own layout, development, and troubleshooting paintings. the target is to augment the ability units of a big inhabitants that designs and builds broadband cable crops, in addition to these conserving and troubleshooting it. a wide cross-section of technical team of workers who have to research those abilities layout, keep, and repair HFC structures from sign production via transmission to reception and processing on the buyer finish aspect. moreover, data/voice and video experts have to grasp and reference the fundamentals of HFC layout and distribution sooner than contending with the intricacies in their personal detailed companies. This ebook serves as an important connection with all cable engineers-those who particularly layout and continue the HFC distribution plant in addition to these basically desirous about data/voice expertise in addition to video expertise. integrated is an internet part which includes spreadsheets that have been utilized in constructing the fabric awarded within the e-book.

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Since it is caused by third-order distortion, the level of cross-modulation varies in the same way as CTB; that is, the relative level varies 2dB for every 1-dB change in operating levels. Because of the difficulty in making the test and demonstrated inconsistency in the results, cross-modulation has become less important than CTB as a means of characterizing third-order distortion. The inconsistency may be due to the many terms, whose effects may reinforce or cancel, affecting the cross-modulation on any channel.

5 MHz above visual carrier frequencies. n 2q(q À 1) new signals at frequencies 2ox Æ oy, where ox and oy are any two input carrier frequencies. 5 dB higher in level than the third-harmonic frequencies. 5 MHz above, and half nominally on, visual carrier frequencies. n 4q(q À 1)(q À 2)/6 new signals at frequencies ox Æ oy Æ oz, where ox, oy, and oz are any three different carrier frequencies. 6 dB higher in level than the third-harmonic frequencies. 5 MHz above visual carrier frequencies. 30 CHAPTER 2 Coaxial RF Technology The level of each of these products increases by 3 dB for every 1-dB increase in the levels of the input signals so that the ratio between the desired output signals and third-order products decreases by 2 dB.

35) where g ¼ the phase shift through the device in radians f ¼ the frequency in Hz In an ideal RF system, the transmission time is the same at all frequencies and the group delay is therefore a frequency-independent constant; if it is not, the various frequency components of a signal will not arrive simultaneously at a receiver. Signal types have differing tolerances to group delay variation. For example, chroma delay is a measure of the arrival time of the chroma signal relative to an analog video luminance signal.

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