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Q. Illustrate the basic working of Modem?
Modem: Modems are generally provided by network operators or by vendors who aren't necessarily the manufacturers of computer systems. Henceforth there is a need to standardize interface between modem and computer equipment. CCITT terminology for modem is data circuit terminating equipment (DCE) and for the computer it's data terminal equipment (DTE). DCE isgenerally referred to as data communication equipment, outside CCITT. It issignificant to recognize that DTE and DCE are generic terms and may be applied to a range of equipments not essentially only to computers or modems . For instance, a DTE can be a terminal, workstation or a computer and a DCE may be a modem or a computer based node in a data network. A series of standards, called V-series has been stated by CCITT for interfacing DTEs to DCEs operating with PSTNs. Series also defines a variety of DCEs using different modulation techniques and operating at different speeds using either a leased PSTN or dial-up line illustration of DTE-DCE interface standards and other standards related to data transmission on PSTN are:V.5 Standardization of data signalling rates for synchronous data transmission in the PSTN
V.24 DTE-DCE interface and control signals
V.28 DTE-DCE electrical characteristics for unbalanced double-current interchange circuits.
V.53 Limits for the maintenance of telephone type circuits used for data transmission.
Q. Frequency response of amplifiers? All amplifiers exhibit variations of performance as the signal frequency is changed. The frequency response of an amplifier may be defined
what is the conductive material property''s?
Suppose that a video signal, having W = 5 MHz, is transmitted via FM with f = 20 MHz. For 1/100 ≤ B/fc ≤ 1/10, determine the bounds on the carrier frequency. Use WFM ∼ = 2(ω + 2W
Q. Tone used in stronger telephony? Dial Tone: This tone is used to specify that exchange is ready to accept dialled digits from subscriber. Subscriber must start dialling only
Q. Consider the MOSFET circuit with variable voltage, with RD = 2k and VDD = 12 V. The static characteristics of the n-channel enhancement MOSFET are given in Figure. (a) Drawt
Q. (a) Draw the logic diagram of the enabled D latch using only NAND gates. (b) Complete the timing diagram of Figure (a) of theDlatchwhose block diagram and truth table are giv
Q. Two shunt generators operate in parallel to supply a total load current of 3000 A. Each machine has an armature resistance of 0.05and a field resistance of 100. If the generat
tension and sag problems
1. A 1 μm long and 100 μm 2 cross-sectional area silicon bar is doped with 10 16 /cm 3 phosphorous. Use the graph below to: a. Find the current at 300°K with 10 V applie
ANI AND Immediate with Accumulator Instruction 8 bit data specified in the instruction is logically AND with the contents of the accumulator. The result is stored in
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