44. Which of the following is not true?

(A)
(0)
(0
(0)

5071877” 18 an optical transmission interface

Synchronous digital hierarchy is a compatible version of SONET
The basic SONET building block consists of 810 octets

DataRate corresponding to SONET STS-3 is 622.08 Mbps.

45. Which is NOT true?

(A)
(0)

(0
(0)

46.
(A)
(0

Code Division Multiplexing (CDM) uses spread spectrum communication

In CDMA, the codes assigned to the stations are carefully generated codes called
chip sequences

In CDMA, it constricts bandwidth’s digital signals or frequencies

Walsh Codes are most commonly used in the orthogonal codes of CDMA
applications

is a loss of power of a satellite downLink signal due to earth’s atmosphere.
Geo-energy loss ൯) Path loss
Wave strength loss ൯) Frequency loss

47. Which is not ೩ valid statement?

(A)
(0)
(0
(0)

Because of its large wavelength, radio waves can penetrate through walls and
similar structures.

Radio waves can have wavelength from 1 mm — 100,000 km.
Radio frequencies are sub-divided into six bands.

Radio waves of high frequencies are never absorbed by rain or similar obstacles

48. The common characteristic properties of the laser radiation are given as

1. Monochromaticity

2. Directionality

3. Coherence

4. High brightness

Choose the correct from the below.

(^) 1, 2, 3 and 4 are true (B) Only 3, 4 are true

(C) 1,3 and 4 are true (D) Only 2, 8 and 4 are true
49. Moon bounce matches with

(A) Earth-moon-earth communication (B) Radio communication

(C) Radio amateurs ൯) All of the above
A 11 098/2022

[P.T.0.]