{br} STUCK with your assignment? {br} When is it due? {br} Get FREE assistance. Page Title: {title}{br} Page URL: {url}
UK: +44 748 007-0908, USA: +1 917 810-5386 [email protected]

Question 1:
Simplify the following expression (10 pts):
cos (2πft + π/2) + sin(2πft – π)
Question 2:
Support the fact that, in a transmission system using radio frequencies, increasing the
transmission frequency by a factor of 3 incurs a penalty (loss) ofapproximately 9.5 dB (10 pts).
Question 3:
How much bandwidth does a communication channel need to achieve a capacity of 40 Mbps
with a Signal-to-Noise ratio of 255? (Note: 1 Mbps is 1,000,000 bps) (10 pts)
Question 4:
Given the following parameters:
N = number of hops between two end systems
L = message length in bits (e.g., length of the original message, before being divided in
several packets)
B = data rate in bps, on all links
P = fixed packet size in bits
H = overhead (header) in bits per packet
D = propagation delay per hop in second
The number of packets (Np) required to send the original message of length L (in bits) can be
computed as:
𝑁𝑁𝑝𝑝 = � 𝐿𝐿
𝑃𝑃 − 𝐻𝐻�
The total end-to-end time delay for packet switching is calculated using the formula:
T = Np * (P/B) + (N-1) * (P/B) + N * D
Let us assume that L/(P-H) is an integer. What value of P, as a function of N, L, and H would
minimize the end-to-end time delay? (10 pts)
Question 5:
A Virtual Channel Identifier (VCI), in the header of an ATM cell, is used for routing to and from the end
user. Explain why a VCI is needed together with the Virtual Path Identifier (VPI). (10 pts)
Question 6:
Is there a need for a network layer in a broadcast network? Justify your answer. (10 pts)
Question 7:
Describe the significance of the following IPv4 header fields (10 pts):
(a) Time to live (b) Protocol
Question 8:
The transmit power of a station is 57.67 dBm (10 pts).
(a) How much power in KW is this equivalent to?
(b) Using an antenna with 1 GHz carrier frequency, what will be the received power in dB at
a free space distance of 0.5 km?

Sample Solution

This question has been answered.

Get Answer
WeCreativez WhatsApp Support
Our customer support team is here to answer your questions. Ask us anything!
👋 Hi, how can I help?