Network Fundamental - Channel Capacity - Signal Level

You are required to find the "BitRate" speed of a noiseless channel that transmit 8 (EIGHT) signal levels with a bandwidth of 4000Hz.

Tips Formula : 2 x [bandwidth Hz] x log2 [Signal levels] = BitRate

• 24000 bps

• 12000 bps

• 18000bps

• 36000 bps

UNN tower required to send 512 kbps over a noiseless channel with a bandwidth of 60kHz. How many signal level [x] that UNN tower need?

Formula : BitRate : 2 x Bandwidth x Log2 [x]

Refer to Slide Page 12

Tips : "kbps convert to bps, Example : 265 kbps convert to bps is 265,000"

kHz convert to Hz, Example : 20 kHz convert to Hz is 2000

• 23.453 Signal Level

• 21.435 Signal Level

• 19.247 Signal Level

• 18.733 Signal Level

Power of a signal is 20mW and the power of noise is 20μW. What is the Signal Noise Ratio (SNR) and the SNRdb?

Tips : Look in Slide Page 15

For this question, you are required to do 2 answer.

• SNR : 1000

  SNR : 10db

• SNR : 2000

  SNRdb : 20db

• SNR : 1000

  SNRdb : 20db

• SNR : 2000

  SNRdb : 30db

Claude Shannon Formula Theory stated that

"Capacity = bandwidth x log2 (1 + SNR)",

SNRdb = 48 with a bandwidth of 2Mhz. find the capacity.

Convert to Whole Number

• 32Mbps

• 48Mbps

• 24Mbps

• 96Mbps

A location have a signal comprises of five Wireless frequencies : 300, 400, 600, 700, and 900Hz, What is the bandwidth?

• 400Hz

• 600Hz

• 200Hz

• 700Hz