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HFC is used by multi-system operators (MSO) and cable operators as a service delivery architecture. It uses coaxial and fiber optic cabling to distribute voice content, data and video to and from the headend and subscribers. Signals are typically sent from the headend via a hub to within a mile of the final destination using a fiber optic cable. For a service area that ranges from 64 homes to 1,000 subscribers, the fiber optic cable is terminated in an HFC node. Optical signals are then converted to radio frequency (RF) signals and transmitted via coaxial cable to subscriber's businesses or...

SiPh involves data that is transferred between computer chips by using optical rays. Although this might sound simple, it can be difficult to understand. It might therefore help to compare it to electrical circuits. The first electrical circuits used discrete components e.g. resistors, capacitors and transistors that were interconnected with tracks on a printed circuit board. Discrete components were later formed adjacently on a single silicon substrate and interconnected to reduce cost and size. This was the start of integrated circuits (ICs or chips). The type of components that could be manufactured this way expanded while their power consumption and size...

WDM is a method of separating or combining multiple wavelengths out of or into a single fiber strand with each wavelength carrying a different signal. Using optical filters lets a certain range of wavelengths pass through, while another range is allowed. Thin-film filter technology (TFF) is often used to achieve this effect. Multiple thin layers are stacked and interference effects are created by sequential reflections on the interface between the layers. This lets light reflect for certain wavelengths and pass through for others. The capacity of a network can be increased cost effectively by using WDM. Two types of WDM...

Remote electrical tilt (RET) is a base station antenna capability that enables RET operators to alter the direction of their antenna beams remotely. This allows them to adjust their networks without having to move the antennas physically or climb up a cell tower. It is done using electrical equipment, and standards have been established by the Antenna Interface Standard Group (AISG). An AISG controller is connected to antenna line devices (ALDs) with a smart bias tee and the signal is transmitted up the tower using the feeder line. Normally, the AISG controller is located near or at the base station.  It...

Having an accurate measurement of signal strength in decibels (dBm) is crucial when installing your cell phone signal booster system. Decibels accurately measure the signal strength you are receiving. How do you measure it? How to measure signal strength in dBm on iPhone: Dial *3001#12345#* then press Call. Hold down power button until you see, "Slide to Power Off". Then release the power button. Hold the Home button until your main screen appears. If you want to check 3G/1x network signal strength but your iPhone is picking up 4G/ LTE signal, go to Settings > Cellular > Cellular Data Options...