Explain how the probability of blocking in a telecommunications system is defined using each of the following two assumptions. i) Blocked calls are lost. ii) Blocked calls are held. Assuming that blocked calls are lost, calculate the grade of service if 100 subscribers share 5 transmission channels, and each subscriber generates 0.04 Erlang of traffic. Find the number of channels required to improve the grade of service to 1% or better. • Given that the average time of a call is 72 second. Find the number of calls lost due to blocking during the busiest hour using the improved system.

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According to the book the answers are

In a blocked-calls-delayed cellular system with 15 trunked channels, the load per user is 0.04 Erlangs and A= 0.25 calls/hour. Find the probability that a delayed call will have to wait for more than 5 s at a GOS of 2%. 90.1 % 88.5 % 94.1 % 94.9 % O O

5. Fading does not occur when mobile receiver is stationary. a) True b) False

1) Assume that a circular cell has 57 channels and a cell radius of 10 km. The transmit power of the base station in this cell is 32 W. The path loss exponent in this cell is assumed to be 4. The grade of service is established to w be a probability of blocking of 5% (assuming blocked calls are cleared). Assume the average call length is two minutes, and each user averages two calls per hour. Further, assume the cell has just reached its maximum w m w m m capacity and must be split into four new microcells to provide four times the capacity in the same area. a) What is the curent user capacity of this cell? wwwm ww m w b) What is the radius and transmit power of the new cells? wwwwww wwwwwm www wwwwwwwwg vwww c) How many channels are needed in each of the new cells to maintain frequency reuse stability in the system? d) If traffic is uniformly distributed, what is the new traffic carried by each new cell? Will the probability of wwwww vww m vww vwwwww wv wwww wwww www wwm w blocking in…

Consider as a simple telephone network consisting of two end workplacesand one intermediate switch with a 1 MHz full duplex trunk between eachend workplace and the intermediate switch. Assume a 4 kHz channel foreach voice call. The telephone is used to make four calls per 8 hour workdayin average, with mean call duration of five minutes. Twelve percent of thecalls are long distance. Analyse and determine the maximum number oftelephones an end workplace can support.   Note: Please explain the answer process clearly.

According to the book the answers are 598 calls , 3 min dur

In a 10-trunk circuit, there are 180 calls in one hour. The average holding time per call is 2 minutes. Calls that fail to seize a circuit are immediately dropped. Determine the probable amount of carried traffic in Erlang

Which of the following is true for the Point of presence (P.O.P)? O None of these. O Itis interface point between communication entities. O It is used to connect between two telephone companies within the same region. O It is a building to which subscriber home and business lines are connected locally.