1. 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

2. 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

3. 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

4. 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

5. 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

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

space-division

time-division

virtual

packet

7. IBM's Token-Ring network uses

adaptive routing

source routing

alternative routing

spanned tree routing

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

100 Base-TX

100 Base-FX

100 Base-T4

100 Base-T1

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

NIC

MAU

Nine-pin connector

Transceiver

10. Ether LAN uses

polar encoding

diferential manchester encoding

manchester encoding

NRZ