201. It is desired to send a sequence of computer screen images over an optical fiber. The screen is 480 x 640 pixels, each pixel being 24 bits. There are 60 screen images per second. How much bandwidth is needed, and how many microns of wavelenth are needed for this band at 1.30 microns?

1.0 x 105 microns

2 x 105 microns

2.5 x 105 microns

5 x 105 microns

202. How much bandwith is there in 0.1 micron of spectrum at a wavelength of 1 micron ?

20,000 GHz

25,000 GHz

30,000 GHz

None of these

203. A 100 km long cable runs at the T1 data rate. The propagation speed in the cable is half the speed of light. How many bits is in the cable ?

572

672

772

873

204. To interface a computer terminal with a modem, required physical layer standard is

RS 424 - A

RS 232 - C

RS 449

Either (b) or (c

205. If a network designer wants to connect 5 routers as point-to-point simplex line, then total number of lines required would be

5

10

20

32

206. In which circuit switching, delivery of data is delayed because data must be stored and retrieved from RAM

space-division

time-division

virtual

packet

207. IBM's Token-Ring network uses

adaptive routing

source routing

alternative routing

spanned tree routing

208. Which of the following uses an 8B/6T encoding scheme?

100 Base-TX

100 Base-FX

100 Base-T4

100 Base-T1

209. Which of the given below houses the switches in Token Ring ?

NIC

MAU

Nine-pin connector

Transceiver

210. Ether LAN uses

polar encoding

diferential manchester encoding

manchester encoding

NRZ

211. The station-to-hub distance in which of the following is 2000 meters ?

100 Base-TX

100 Base-FX

100 Base - T4

100 Base - T1

212. Which of the following is not a transceiver function?

Transmission and receipt of data

Checking of line voltages

Addition and subtraction of headers

Collision detection

213. In Token Ring, when a frame reaches its destination station, then

message is copied

four bits in the packet are changed

message is taken of the ring and replaced by the token

both (a) and (b)

214. What can happen at a Token Ring station

Examination of the destination address

Regeneration of the frame

Passing of the frame to the next station

All of these

215. The monitor station in what standard ensures that one and only one token is circulating ?

802.3

802.5

Both (a) and (b)

All of these

216. What uses a physical star topology ?

10 base 5

10 base 2

10 base T

None of these

217. Frequency range at which the land coaxial cables are used, is

106 to 108 Hz

1010 to 1011 Hz

103 to 104 Hz

None of these

218. In a broad sense, a railway track is an example of

simplex

half-duplex

full-duplex

All of these

219. Bit stuffing refers to

inserting a '0' in user stream to differentiate it with a lag

inserting a '0' in lag stream to avoid ambiguity

appending a nibble to the lag sequence

appending a nibble to the use data stream

220. Unmodulated signal coming from a transmitter is known as

carrier signal

baseband signal

primary singal

None of these