1.A co-axial cable has a bandwidth of 1000 MHz. The cable is to be used in a Fre

Question

1.A co-axial cable has a bandwidth of 1000 MHz. The cable is to be used in a Frequency Division Multiplexing system to carry simultaneous music channels. The base bandwidth for the music has been restricted to 15 kHz, How many music channels can the cable support?

2.A fibre optic cable can carry 450 independent channels, each using a different wavelength of light - Wavelength Division Multiplexing (WDM). Each channel can support 200 Gbps. A single telephone connection requires 64 kbps. How many simultaneous telephone connections can the cable carry?

3.A radio station transmitting on 12095 kHz using Full AM, has it's base bandwidth restricted to 7 kHz.

i. What is the transmission bandwidth?

ii. What is the lowest radio frequency transmitted?

iii. What is the highest radio frequency transmitted?

4.A file of 10,000 characters is to be sent over a 2,400 bps transmission line. Calculate the percentage overhead and the time taken to send the file over the line using asynchronous transmission with 8 bit ASCII coding, 1 start bit, 1.5 stop bits and 1 parity bit.

5.The Baud rate of a communication channel with 8 signalling states is 120 Bd. What is the bit rate?

6.A communication channel has a capacity of 2400 Bd. The throughput of the system is required to be 12000 bps. How many signalling states are required?

Explanation / Answer

Answer 1 : )

Bandwidth of a co-axial cable =1000MHz ( Given)

The Base Bandwidth for the music has been restricted to = 15 kHz. ( Given )

Now , Let's assume the base Bandwidth has been restricted very tightly,,Then

We can have number of music channels that can the cable support = Bandwidth/Base Bandwidth

i.e. no. of music channels = 1000/15 ( This uses Frequency Development Multiplexing System i.e. FDMA )

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