What is BS EN 60510-3-4 - Frequency division multiplex about?
BS EN 60510 is a series on methods of measurement for radio equipment used in satellite earth stations. Radio equipment is a set of equipment necessary to carry on communication via radio waves. BS EN 60510-3-4 deals with baseband-to-baseband measurements for frequency division multiplex (f.d.m) telephony.
These measurements are added to those already given in part 1, section 4 of BS EN 60510-3-4: Measurements in the baseband, which are common to telephony and to television, for example, group-delay and amplitude/frequency characteristics. All of the measurements are carried out on a system loop either by establishing a transmission path through the transmitting and receiving chain via a test loop translator or by means of an I.F. loop.
Who is BS EN 60510-3-4 - Frequency division multiplex for?
BS EN 60510-3-4 on frequency division multiplex is useful for:
- Telecommunication component manufacturers
- Telecommunication equipment manufacturers
- Design engineers
- Quality control personnel
Why should you use BS EN 60510-3-4 - Frequency division multiplex?
Radio equipment generally is a receiver or transmitter or transceiver, an antenna, and some smaller additional equipment necessary to operate them. The noise-loading performance of a system is the noise power measured in a chosen narrow measuring channel, which simulates an unloaded telephone channel when the baseband is loaded with random noise of uniform spectrum (white noise) at a conventional loading level. The white noise applied to the baseband input of the system under test is limited to the frequency band occupied by the telephone channels by means of a high-pass and a low-pass filter. Noise-measuring channels are provided by means of narrow band-stop filters which allow performance to be measured at several frequencies including channels located close to the bottom, middle and top of the baseband, frequency range.
BS EN 60510-3-4 defines noise power ratio that is defined as the ratio of the noise power in a measuring channel when the baseband is fully loaded with the white noise load, to the power in that channel either with all the baseband loaded except the measuring channel (i.e., total noise) or with all the baseband unloaded (i.e., basic noise); n.p.r. is always expressed as a positive number of decibels. The signal-to-noise ratio is defined as the ratio of the power of the standard test tone (0 dBm0) to the noise power, in a specified bandwidth within the noise-measuring channel, both being referred to at the same point in the circuit. The signal-to-noise ratio may be measured weighted or unweighted and is expressed as a positive number in decibels. Conversion between commonly encountered noise-loading measurement units may be made by reference to BS EN 60510-3-4. Using BS EN 60510-3-4 you can specify baseband-to-baseband measurements for frequency division multiplex (f.d.m) telephony.