Question 1

What is the time duration of a bit if data is transmitted at 270.833 kbps in the channel?&#10;A)270.833 s&#10;B)3 ?s&#10;C)3.692 ?s&#10;D)3.692 s

Accepted Answer

The time duration of a bit, also known as bit time, can be calculated using the formula bit time = 1 / data rate. Given a data rate of 270.833 kbps (kilobits per second), the bit time is 1 / 270,833 bits per second = 3.692 microseconds (µs), not seconds.

Question 2

US digital cellular system based on CDMA was standardized as_________&#160;&#160;&#160;&#160;&#160;&#160;&#10;A)is-54&#10;B)is-136&#10;C)is-95&#10;D)is-76

Accepted Answer

The US digital cellular system based on CDMA was standardized as IS-95.

Question 3

IS-95 was not compatible with existing AMPS frequency band.

Accepted Answer

IS-95, also known as cdmaOne, was designed to be compatible with the existing AMPS (Advanced Mobile Phone System) frequency band, allowing for a smoother transition and coexistence with the older analog system.

Question 4

Which of the following is used by IS-95?&#10;A)dsss&#10;B)fhss&#10;C)thss&#10;D)hybrid

Accepted Answer

IS-95 uses Direct Sequence Spread Spectrum (DSSS) for spreading the signal over a wider bandwidth.

Question 5

IS-95 uses same modulation technique for forward and reverse channel.

Accepted Answer

IS-95 uses different modulation techniques for forward and reverse channels: it uses QPSK (Quadrature Phase Shift Keying) for the forward link (from base station to mobile) and QAM (Quadrature Amplitude Modulation) for the reverse link (from mobile to base station).

Question 6

IS-95 is specified for reverse link operation in_________&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;band.&#10;A)869-894 mhz&#10;B)849-894 mhz&#10;C)849-869 mhz&#10;D)824-849 mhz

Accepted Answer

IS-95, also known as cdmaOne, specifies the reverse link (mobile to base station) operation in the 824-849 MHz band.

Question 7

User data in IS-95 is spread to a channel chip rate of_________&#160;&#160;&#160;&#160;&#160;&#160;&#10;A)1.2288 mchip/s&#10;B)9.6 mchip/s&#10;C)12.288 mchip/s&#10;D)0.96 mchip/s

Accepted Answer

In IS-95, user data is spread to a channel chip rate of 1.2288 million chips per second (mchip/s). This spreading is a key feature of CDMA technology, which IS-95 utilizes.

Question 8

__________&#160;&#160;&#160;&#160;&#160;are used to resolve and combine multipath components.&#10;A)equalizer&#10;B)registers&#10;C)rake receiver&#10;D)frequency divider

Accepted Answer

Rake receivers are specifically designed to resolve and combine multipath components in wireless communication systems, improving signal quality by capturing and combining the different paths a signal can take due to reflections and scattering in the environment.

Question 9

CT2 was the first generation of cordless telephones.

Accepted Answer

CT1 was the first generation of cordless telephones, introduced before the CT2 standard.

Question 10

CT2 is analog version of first generation cordless telephones.

Accepted Answer

CT2 is a digital cordless telephone standard, not analog, and it represents the second generation of cordless telephones.

Deck 11: Digital and Analog Telecommunications Standards