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CPU Based Exchange: In centralized control, all control equipment is replaced by a single processor which should be quite powerful. It should be capable of processing 10 to 100 calls per second, depending on load on the system and concurrently performing many other ancillary tasks. A typical control configuration of an ESS using centralized SPC is demonstrated in Figure. A centralized SPC configuration can use more than one processor for redundancy purposes. Though there are a large number of services that can be offered by CPU based exchange, they can be grouped under four wide categories.
1. Services associated with calling subscribers and designed to decrease time spent on dialling and number of dialling errors.
2. Services associated with called subscriber and designed to increase call completion rate.
3. Services involving more than two parties.
4. Miscellaneous services.
Continuity Equation: Explain continuity equation and discus the special case of continuity equation when concentration is independent of time and with zero electric field.
Q. Comment brie?y on the following: (a) Why are waveguides not used at low frequencies? (b) Why are open-wire lines not generally used as guiding structures at very high freq
DC Load line
A step index multi mode fibre along with numerical aperture of 0.2 supports approximately 1000 modes at an 850µm wavelength. Calculate a) What is the diameter of the core? b)
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The Electrical Circuit sign convention Notice that current leaves a source at its high potential (positive) terminal but enters a load at its high potential (positive) ter
Q. Antinoise Systems — Noise Cancellation? Traditionally sound-absorbing materials have been used quite effectively to reduce noise levels in aircraft, amphitheaters, and other
the p.u. reactance of a 25 MVA, 13.2 kV alternator 0.5 p.u. On a base of 50 MVA and 13.8 KV the p.u. value shall be
Q. What do you mean by Double Word? A double word is precisely what its name implies, two words. Thus, a double word quantity is 32 bits. Logically, this double word can be div
A single phase line has an impedance of 8.4 + j11.2 Ω. The line feeds a load consisting of a resistor and an inductor connected in parallel as shown in Figure 1. The load is absorb
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