Two switching centres are connected by 20 trunks, with a busy-hour traffic of 0.5E per trunk. Use the data in Table 1 to find the probability that a trunk will be unavailable for a call, given that callers are unable to find a free line either:- i) ii) Hold on even though unconnected. Terminate the call immediately and do not try again. Table 1 k 10* k! M * 10 10 2755.7 12842.3 11 2505.2 15347.5 12 2087.7 17435.2 13 1605.9 19041.1 14 1147.1 20188.2 15 764.7 20952.9 16 477.9 21430.8 17 281.1 21712.0 18 156.2 21868.2 19 82.2 21950.4 20 41.1 21991.5

4. What happen to a call in fixed channel strategy, if all the channels in a cell are occupied? a) Queued b) Cross talk c) Blocked d) Delayed

Why must kmaps consist of the following two things:1: groups have to be recanges with sizes of power 2 2: Why do we order our rows and colums 00/01/11/10?

Digital telephony always uses time division switching. FALSE ..TRUE

In time the use of the ________ became the more desirable approach because an important parameter of the equivalent circuit was determined by the actual operating conditions rather than using a data sheet value that in some cases could be quite different. a.hybrid b.hybrid-pi c.re d.pi

GIVEN: Three-phase System Data: 30 Source ZLine 30 Load Ean Zan = Zbn = Zen = 0.1 + j1.5 n Source: 12020° v; Epn = 1202 – 120° v; Een = 1204120° v (grounded neutral) Line Impedance: Zline a = Zline b Zline c = 1+ j2 N; C Load Impedance: Zab 40 + j30 N; Zbc = 40 – j30 N; Zca = 50 + j0 N %3D %3D

Construct an 8-to-1-line multiplexer using seven 2-to-1-line multiplexers. No other gate is allowed to use. Hint: please first draw the truth table of an 8-to- 1-line multiplexer. And then inspect the truth table to find out how to organize the seven 2-to-1-line multiplexers. The eight inputs of the 8-to-1-line multiplexer are I0 ~ 17 and the three control signals (also called selecting signals) are S2, S1, and SO. The output is F. Out Put Solutia tme c to I, 2:1 max 3 1. DAt Put F mux lic Solution time うて

Call Completion Rate is defined as O a. the ratio of the number of successful calls to the number of calls attempts O b. the addition of the number of successful calls to the number of call attempts. O c. the ratio of the number of call attempts to the number of successful calls. O d. Both (a) and (b)

I need the answer at 20 minute.

Compute using 4 decimal places and use scientific notation when necessary Box all final answers. FIND: 2. Under Unbalanced Condition With Faults: a. Load Line Currents (Ia, Ip,Ic);