By Eugene Bartlett
Cable is now as a lot within the broadband company because it is tv. This e-book explains the basics of coaxial cable expertise and the DSP that controls it, besides the cable modem and voice over IP expertise now vastly altering the cable operators’ company. geared toward operating engineers and technicians, it could possibly even be used a textbook for the a simple cable communications direction in a 2 yr tech application.
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The reception of UHF broadcast stations was carried on the cable systems by converting each one of them to one of these 9 mid-band cable channels at the headend. The block up-converter at the subscriber’s television set would then convert them back from mid-band to UHF. Back in the 1970s the 21-channel cable system offered a decent selection of programming with better reception than most indoor or outdoor antennas. The success of 21-channel systems encouraged the expansion of cable operators to increase the upper frequency limit to 300 MHz.
Chapter 2 50 Figure 2-6 Trunk ampliﬁer routing needed to cover the service area 15 amps 2 amps/mile 1. Determine headend site. a. Test headend site for off-air reception (signal survey test). b. Satellite signal survey (computer data or on site). 2. Define service area — miles/roads. 3. Draw skeletal trunk route; determine miles. 4. Calculate amplifiers/miles of selected trunk cable. 5. Make any changes in routing and cable size to cover plant layout. 212 The feeder or distribution system contains the subscriber taps, which are the part of the system that produces revenue.
System design and layout was often done manually on a drafting table, overlaying the design on a series of street maps. S. Coast and Geological Survey maps. Many utility companies also offer their maps on either ﬂoppy disk or CDROM. Once maps are obtained, then strand mapping can commence. Since maps may not contain any late changes, a measurement using a measuring wheel or a surveyor’s transit and stadia rod to measure the distance between utility poles may be necessary. If utility poles are not going to be used, then a wheel measurement along the buried plant route should be made.
Cable Communications Technology by Eugene Bartlett