RHM 3 ESAT PART 1

Which of the following is not an analog- to-analog conversion?

_______ is designed to be used in wireless applications in which stations must be able to share the medium without interception by an eavesdropper and without being subject to jamming from a malicious intruder.

The commercial name for a PAN network technology similar to Bluetooth that is a short-range technology with networking capability is

How many of each of the following signals would fit into a 1 MHz spectrum allocation? Voice, with a maximum frequency of 4 kHz, modulated using SSBSC AM.

______ substitutes eight consecutive zeros with 000VB0VB.

How many bit network mask is used for all class B IP addresses?

Substitutes four consecutive zeros with 000V or B00V

ASK, PSK, FSK, and QAM are examples of ______conversion.

For the PCM coding scheme with resolution of 1V, determine the quantized level and quantization error (Qe) voltage of +1.07 V.

A special sequence of bits that determine if the packet is being sent to its network is called the

AM and FM are examples of ______conversion.

In QAM, both ______ of a carrier frequency are varied.

Determine the BCS for the following data and CRC generating polynomials: Data G(x) = x^7+x^5+x^4+x^2+x^1+x^0 = 10110111 CRC P(x) = x^5+x^4+x^1+x^0 = 110011

Which class IP addresses were designed for large networks?

If the baud rate is 400 for a QPSK signal, the bit rate is ______ bps.

A group of 20 servers carry a traffic of 10 Erlangs. If the average duration of a call is three minutes, calculate the number of calls put through by the group as a whole is one hour per period.

If the bit rate for an ASK signal is 1200 bps, the baud rate is______.

The most widely used IR data communication system was developed by HP and has since become an international standard is referred to as

The ________Technique uses M different carrier frequencies that are modulated by the source signal. At one moment, the sign modulates one carrier frequency; at the next moment, the signal modulates another carrier frequency.

A vehicle travels through a cellular system at 100 kilometers per hour. Approximately how often will handoffs occur if the cell radius is 10 km?

In modulo-2 arithmetic, we use the _____ operation for both addition and subtraction.

In_____coding, we divide our message into blocks, each of k bits, called____ .

In what type of multiplexing does each signal occupy the entire bandwidth of the channel?

Determine the channel capacity if each macrocell is split into four minicells and each minicell is further split into four microcells for a cellular telephone area comprised of seven macrocells with 10 channels per cell.

The sound power level of a jet plane flying at a height of 1 km is 160 dB. What is the maximum sound pressure level on the ground directly below the plane assuming that the aircraft radiates sound equally in all directions?

We add r redundant bits to each block to make the length n = k + r. The resulting n-bit blocks are called .

The ________between two words in the number of differences between corresponding bits.

Which of the following is a very popular form of multiplexing where multiple channels of digital data are transmitted in serial form?

If a note has a fundamental frequency of 100Hz, what is its 5th octave?

To guarantee the detection of up to 5 errors in all cases, the minimum Hamming distance in a block code must be

To guarantee correction of up to 5 errors in all cases, the minimum Hamming distance in a block code must be .

What type circuits are used to remedy the synchronization problem encountered in demultiplexing?

What is the color subcarrier for channel 7?

In a linear block code, the_____of any two valid codewords creates another valid codeword.

The divisor in a cyclic code is normally called the .

A generator that contains a factor of _____ can detect all odd-numbered errors.

How is the relation between Erlang and CCS specified?

38. A simple parity-check code can detect_____ errors.

39. If the appropriate system is used, what stage will output the name and artist of music selections being played by the station?

Codes are special linear block codes with one extra property. If a codeword is rotated, the result is anothe codeword.

_____ conversion is the representation of analog information by an analog signal.

42. Analog-to-analog conversion is needed if the available bandwidth is_____________.

43. What is the typical distance for IR data communication links between computers, computers and printers, or ad hoc PANs?

44. Which of the following is not a digital- to-analog conversion?

45. In_______, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant.

46. The device that consists of a cable attached to the interface in a PC which can be positioned to provide a clear view of the device to which it will communicate is a transceiver

47. In______, the frequency of the carrier signal is varied to represent data. Both peak amplitude and phase remain constant.

_____ uses two carriers, one in-phase and the other quadrature.

49. The spacing between nonbroadcast TV channels as set up by the cable TV industry is

A telephone line has a bandwidth of 3.2kHz and a signal-to-noise ratio of 35 dB. A signal is transmitted down this line using a four-level code. What is the maximum theoretical data rate?

_______signals can have only limited number of values.

Frequency and period are ______.

During the busy hour, on average, a customer with a single telephone line makes three calls and receives three calls. The average call duration is 10 minutes. What is the probability that a caller will find the line engaged?

_____is the rate of change with respect to time.

______ describes the position of the waveform relative to time 0.

A sine wave in the ____ domain can be represented by one single spike in the domain.

A local loop has a resistance of 1 kΩ, and the telephone connected to it has an off-resistance of 200 Ω. Calculate the loop current and the voltage across the telephone when the phone is on-hook

A_____ sine wave is not useful in data communications; we need to send a_____signal.

The ___________ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal.

Which type of analog-to-digital converter uses a large resistive voltage divider and multiple analog comparators?

A cellular telephone system uses a 12- cell repeating pattern. There are 120 cells in the system and 20,000 subscribers. Each subscriber uses the phone on average 30 minutes per day, but on average 10 of those minutes are used during the peak hour. Calculate: the average and peak traffic ion erlangs for the whole system.

Unipolar, bipolar, and polar encoding are types of_______encoding.

_____ encoding has a transition at the middle of each bit.

The ratio of the average signal power of the carrier plus the sidebands to the noise power is called the

Determine the channel capacity for a cellular telephone area comprised of seven macrocells with 10 channels per cell.

__________ encoding has a transition at the beginning of each 0 bit.

PCM is an example of ________conversion.

The measure of how fast data can be transmitted in a given bandwidth is referred to as

What is the speed of sound in air at 20º?

If the frequency spectrum of a signal has a bandwidth of 500 Hz with the highest frequency at 600 Hz, what should be the sampling rate, according to the Nyquist theorem?

The Nyquist theorem specifies the minimum sampling rate to be _____.

Constellation diagrams are widely used with which of the following modulation types?

Calculate the reverberation time of the room, which has a volume of 8700ft^3 and a total sound absorption of 140 sabines.

Which of the following encoding methods does not provide for synchronization?

Which encoding method uses alternating positive and negative values for 1s?

The circuitry used to translate a baseband signal to a higher transmission frequency that is better suited to the transmission medium is a

How is the relation between Erlang and CCS specified?

Which quantization level results in a more faithful reproduction of the signal?

Block coding can help in _____at the receiver.

Which of the following is not a main type of modulation used in modern modems?

An RGB video signal has normalized values if R = 0.2, G = 0.4, B = 0.8. Find the values of Y, I, and Q.

In ______transmission, bits are transmitted simultaneously, each across its own wire.

In _____ transmission, bits are transmitted over a single wire, one at a time.

If a binary signal were applied directly to a telephone network

What is the sound intensity for an RMS pressure of 200 Pascal?

In______transmission, a start bit and a stop bit frame a character byte.

In asynchronous transmission, the gap time between bytes is .

Which of the following is a typical LAN configuration?

Calculate the total percentage of the signal time that is occupied by horizontal blanking.

__________ conversion involves three techniques: line coding, block coding, and scrambling.

______ is the process of converting digital data to a digital signal.

The standard speed for Ethernet LANs is

Checksums use _____ arithmetic.

_______ provides redundancy to ensure synchronization and inherent error detection.

_____ is normally referred to as mB/nB coding; it replaces each m-bit group with an n-bit group.

Which of the following agency establishes and maintains electrical, electronic, and computing standards?

The _____ technique expands the bandwidth of a signal by replacing each data bit with n bits.

______provides synchronization without increasing the number of bits.

A subscriber three phase calls of three minutes, four minutes, and two minutes duration in one hour period. Calculate the subscriber traffic in erlangs, CCS, and CM.

Two common scrambling techniques are______

What type cable consists of a thin center conductor surrounded by an insulating material that is completely encircled by a shield?

The most common technique to change an analog signal to digital data is called .

A modem uses sixteen different phase angles and four different amplitudes. How many bits does it transmit for each symbol?

The first step in PCM is_____.

What provides the input/output interface between each node on a network and the network wiring?

There are three sampling methods: ____.

During the busy hour, on average a customer with a single telephone line makes three calls and receives three calls. The average duration is 2 minutes, what is the probability that a caller will find the line engaged?

_____ finds the value of the signal amplitude for each sample;____finds the change from the previous sample.

Which of the following is not a coaxial cable connector?

While there is (are) only______way(s) to send parallel data, there is (are) three subclass(es) of serial transmission.

For a QPSK system and the given parameters: C=10^-12W, fb=60 kbps, N=1.2 ×10^-14W and B=120 kHz. Determine the Carrier power in dBm, Noise power in dBm, and Noise power density in dBm.

In___transmission, we send 1 start bit (0) at the beginning and 1 or more stop bits (1s) at the end of each byte.

An electronic circuit that takes a partially degraded signal, boosts its level, shapes it up, and sends it on its way is

In_____transmission, we send bits one after another without start or stop bits or gaps. It is the responsibility of the receiver to group the bits.

Determine the peak frequency deviation for a binary FSK signal with a mark frequency of 49 kHz, a space frequency of 51 kHz, and an input bit rate of 2 kbps.