ADVANTAGE EFFECT

Date: 2015-10-07; view: 638.

Listening ------------------------------------------------------------------------------

Introduction

Unit 3 Optical Fibres

(quantity and amount)

This unit deals with a material used for transmitting sound and data: optical fibre. Optical fibre is made of glass and uses light (usually from a laser) to transmit messages.

An engineer is talking to a journalist about the advantages of optical fibre compared with conventional copper cable.

As you listen, match the advantage with its effect(s). The first one has been done for you.

1. Higher capacity a. less frequent repeaters

2. Lower material cost b. more security

3. Smaller size с. cheaper to produce

4. Higher quality of transmission d. more information

5. Complete electrical isolation e. less space in ducts

f. less interference/crosstalk