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diff --git a/1574/CH2/EX2.2/Result_of_Chapter_2_Ex_2_2.JPG b/1574/CH2/EX2.2/Result_of_Chapter_2_Ex_2_2.JPG
new file mode 100755
index 000000000..d2cc9d9cc
--- /dev/null
+++ b/1574/CH2/EX2.2/Result_of_Chapter_2_Ex_2_2.JPG
diff --git a/1574/CH2/EX2.2/SCS_Ex_2_2.sce b/1574/CH2/EX2.2/SCS_Ex_2_2.sce
new file mode 100755
index 000000000..f3a33a08d
--- /dev/null
+++ b/1574/CH2/EX2.2/SCS_Ex_2_2.sce
@@ -0,0 +1,21 @@
+clc;

+// Chapter 2 Switched communication systems

+//Example 2.2, page no 125

+//given

+Io=4*10^-3 //rqueired operating current

+N1=10000 //no of turns in the main winding

+R1=645 //resistence of the main winding in ohms

+N2=200 //no of turns in auxillary winding

+B=2 //spacing bias

+Iaux=B/N2 //maximum auxillary current

+mprintf('maximum auxillary current is:%f mA\n',Iaux*1e3)

+MMFaux=N2*Iaux //MMF in the auxillary winding

+mprintf('MMF in the auxillary winding is:%fAT \n',MMFaux)

+MMFop=Io*N1 //operating MFF in main winding

+mprintf( ' MMF in main winding is:%f AT \n',MMFop)

+MMFnet=MMFop+(0.1*MMFop) //net MMF required in main winding

+mprintf('net MMF required in main winding is:%f AT \n',MMFnet)

+Iop=MMFnet/N1 //operating current needed

+mprintf('operating current needed is:%f mA \n',Iop*1e3)

+V=Iop*R1 //working voltage in volts

+mprintf('working voltage is:%f volts \n',V)

diff --git a/1574/CH2/EX2.3/Result_of_Chapter_2_Ex2_3.JPG b/1574/CH2/EX2.3/Result_of_Chapter_2_Ex2_3.JPG
new file mode 100755
index 000000000..5eace4e79
--- /dev/null
+++ b/1574/CH2/EX2.3/Result_of_Chapter_2_Ex2_3.JPG
diff --git a/1574/CH2/EX2.3/SCS_ex_2_3.sce b/1574/CH2/EX2.3/SCS_ex_2_3.sce
new file mode 100755
index 000000000..a0ab03b61
--- /dev/null
+++ b/1574/CH2/EX2.3/SCS_ex_2_3.sce
@@ -0,0 +1,12 @@
+clc;

+// Chapter 2 Switched communication systems

+//Example 2.3,page no 125

+//given

+C=6000//Tatol no of call in busy hour

+SC=5000//no of subscribers

+CR=C/SC//busy hour calling rate

+mprintf('Busy hour calling rate is:%f \n',CR)

+T=2.5/60//avarage duration of calls in hours

+

+A=C*T//rate of traffic flow

+mprintf('Rate of traffic flow is %f traffic unit ',A)

diff --git a/1574/CH2/EX2.4.0/Result_of_Chapter_2_Ex2_4_Pg126_Top.JPG b/1574/CH2/EX2.4.0/Result_of_Chapter_2_Ex2_4_Pg126_Top.JPG
new file mode 100755
index 000000000..ed1bc9001
--- /dev/null
+++ b/1574/CH2/EX2.4.0/Result_of_Chapter_2_Ex2_4_Pg126_Top.JPG
diff --git a/1574/CH2/EX2.4.0/SCS_ex_2_4_Pg_126_TOP.sce b/1574/CH2/EX2.4.0/SCS_ex_2_4_Pg_126_TOP.sce
new file mode 100755
index 000000000..f612eaf00
--- /dev/null
+++ b/1574/CH2/EX2.4.0/SCS_ex_2_4_Pg_126_TOP.sce
@@ -0,0 +1,16 @@
+clc;

+// Chapter 2 Switched communication systems

+//Example 2.4,page no 126

+//given

+L=3//relay inductance in henry

+R=1500//relay resistance in ohm

+Io=20e-3//oparating current in amps

+Ir=8e-3//release current in amps

+

+V=50//supply volatage in volts

+Im=V/R//maxixmum current in amps

+mprintf('maxixmum current is %f mamps \n',Im*1e3)

+to=(L/R)*log(1/(1-(Io/Im)))//operate lag in sec

+mprintf('operate lag is %f msec \n',to*1000)

+tr=(L/R)*log(Im/Ir)//release lag in sec

+mprintf('release lag is %f msec \n',tr*1000)

diff --git a/1574/CH2/EX2.4.1/Result_of_Chapter_2_Ex2_4_Pg126_Bottom.JPG b/1574/CH2/EX2.4.1/Result_of_Chapter_2_Ex2_4_Pg126_Bottom.JPG
new file mode 100755
index 000000000..381dd6c31
--- /dev/null
+++ b/1574/CH2/EX2.4.1/Result_of_Chapter_2_Ex2_4_Pg126_Bottom.JPG
diff --git a/1574/CH2/EX2.4.1/SCS_ex_2_4_Pg_126_Bottom.sce b/1574/CH2/EX2.4.1/SCS_ex_2_4_Pg_126_Bottom.sce
new file mode 100755
index 000000000..7728baf45
--- /dev/null
+++ b/1574/CH2/EX2.4.1/SCS_ex_2_4_Pg_126_Bottom.sce
@@ -0,0 +1,31 @@
+clc;

+// Chapter 2 Switched communication systems

+//Example 2.4.1,page no 126

+//given

+//a

+C_S1=20/3//speed in characters per second

+P_C1=1/C_S1//periods per character

+mprintf('(a)\nperiods per character is:%f msec\n',P_C1*1e3)

+E_C1=7.5//elements per character

+P_E1=P_C1/E_C1//period per element

+mprintf('period per element is:%f msec\n',P_E1*1e3)

+Sb1=1/P_E1//speed in bauds

+mprintf('speed is:%f bauds\n\n',Sb1)

+//b

+C_S2=10//speed in characters per second

+P_C2=1/C_S2//periods per character

+mprintf('(b)\nperiods per character is:%f msec\n',P_C2*1e3)

+E_C2=7.5//elements per character

+P_E2=P_C2/E_C2//period per element

+mprintf('period per element is:%f msec\n',P_E2*1e3)

+Sb2=1/P_E2//speed in bauds

+mprintf('speed is %f bauds\n\n', Sb2)

+//c

+C_S3=10//speed in characters per second

+P_C3=1/C_S3//periods per character

+mprintf('(c)\nperiods per character is:%f msec\n',P_C3*1e3)

+E_C3=10//elements per character

+P_E3=P_C3/E_C3//period per element

+mprintf('period per element is:%f msec\n',P_E3*1e3)

+Sb3=1/P_E3//speed in bauds

+mprintf('speed is %f bauds\n',Sb3)

diff --git a/1574/CH2/EX2.5/Result_of_Chapter_2_Ex_2_5.JPG b/1574/CH2/EX2.5/Result_of_Chapter_2_Ex_2_5.JPG
new file mode 100755
index 000000000..c1b697f56
--- /dev/null
+++ b/1574/CH2/EX2.5/Result_of_Chapter_2_Ex_2_5.JPG
diff --git a/1574/CH2/EX2.5/SCS_ex_2_5.sce b/1574/CH2/EX2.5/SCS_ex_2_5.sce
new file mode 100755
index 000000000..a7c8e59a6
--- /dev/null
+++ b/1574/CH2/EX2.5/SCS_ex_2_5.sce
@@ -0,0 +1,17 @@
+clc;

+// Chapter 2 Switched communication systems

+//Example 2.5,page no 127

+//given

+N=1000//no of turns

+L1=5e-8//inductance per turn

+L=N^2*L1//total inductance

+mprintf('total inductance is %f H \n',L)

+R=100//resistance of winding in ohm

+MMF=5//operating MMF in amp. turn

+V=1//voltage of received signal in volts

+Im=V/R//maximum current

+mprintf('maximum current is %f mA \n',Im*1e3)

+Io=MMF/N//operating current

+mprintf('operating current is %f mA \n',Io*1e3)

+to=(L/R)*log(1/(1-(Io/Im)))//operate lag

+mprintf('operate lag is %f msec \n',to*1e3)

diff --git a/1574/CH2/EX2.6/Result_of_Chapter_2_Ex_2_6.JPG b/1574/CH2/EX2.6/Result_of_Chapter_2_Ex_2_6.JPG
new file mode 100755
index 000000000..913125182
--- /dev/null
+++ b/1574/CH2/EX2.6/Result_of_Chapter_2_Ex_2_6.JPG
diff --git a/1574/CH2/EX2.6/SCS_ex_2_6.sce b/1574/CH2/EX2.6/SCS_ex_2_6.sce
new file mode 100755
index 000000000..c786cbdae
--- /dev/null
+++ b/1574/CH2/EX2.6/SCS_ex_2_6.sce
@@ -0,0 +1,12 @@
+clc;

+// Chapter 2 Switched communication systems

+//Example 2.6,page no 128

+//given

+S=10000//no of subscribers

+C=16000//Tatol no of call in busy hour

+CR=C/S//busy hour calling rate

+mprintf('Busy hour calling rate is:%f \n',CR)

+T=2.6//avarage duration of calls in min

+

+A=C*(T/60)//rate of traffic flow

+mprintf('Rate of traffic flow is %f traffic unit ',A)

diff --git a/1574/CH2/EX2.7/Result_of_Chapter_2_Ex_2_7.JPG b/1574/CH2/EX2.7/Result_of_Chapter_2_Ex_2_7.JPG
new file mode 100755
index 000000000..a55a64642
--- /dev/null
+++ b/1574/CH2/EX2.7/Result_of_Chapter_2_Ex_2_7.JPG
diff --git a/1574/CH2/EX2.7/SCS_ex_2_7.sce b/1574/CH2/EX2.7/SCS_ex_2_7.sce
new file mode 100755
index 000000000..29c60ae49
--- /dev/null
+++ b/1574/CH2/EX2.7/SCS_ex_2_7.sce
@@ -0,0 +1,13 @@
+clc;

+// Chapter 2 Switched communication systems

+//Example 2.7,page no 135

+//given

+N=7//no of character elements

+E_C=10//elements per character (1+7+1+1)

+To=100e-3//duration of one character

+Te=To/E_C//duration of each element

+mprintf('duration of each element is:%f msec\n',Te*1e3)

+Sb=1/Te//speed in bauds

+mprintf('speed is %f bauds\n',Sb)

+C=2^N//total possible combinations

+mprintf('total possible combinations are:%f',C)

diff --git a/1574/CH2/EX2.8/Result_of_Chapter_2_Ex_2_8.JPG b/1574/CH2/EX2.8/Result_of_Chapter_2_Ex_2_8.JPG
new file mode 100755
index 000000000..9bef6f6e7
--- /dev/null
+++ b/1574/CH2/EX2.8/Result_of_Chapter_2_Ex_2_8.JPG
diff --git a/1574/CH2/EX2.8/SCS_ex_2_8.sce b/1574/CH2/EX2.8/SCS_ex_2_8.sce
new file mode 100755
index 000000000..e5ff781ae
--- /dev/null
+++ b/1574/CH2/EX2.8/SCS_ex_2_8.sce
@@ -0,0 +1,15 @@
+clc;

+// Chapter 2 Switched communication systems

+//Example 2.8,page no 129

+//given

+S=1000//no of subscribers

+T=2.4/60//avarage duration of calls in hours

+A=60//rate of traffic flow

+C=A/T//Tatol no of call in busy hour

+mprintf('Total no of call in busy hour is:%f calls per Hour\n',C)

+CR=C/S//busy hour calling rate

+mprintf('Busy hour calling rate is:%f \n',CR)

+SCL=30//no of call lost per hour

+

+B=SCL/(C+SCL)//grade of service

+mprintf('grade of service is: %f',B)

diff --git a/1574/CH2/EX2.9/Result_of_Chapter_2_Ex_2_9.JPG b/1574/CH2/EX2.9/Result_of_Chapter_2_Ex_2_9.JPG
new file mode 100755
index 000000000..383c74c8d
--- /dev/null
+++ b/1574/CH2/EX2.9/Result_of_Chapter_2_Ex_2_9.JPG
diff --git a/1574/CH2/EX2.9/SCS_ex_2_9.sce b/1574/CH2/EX2.9/SCS_ex_2_9.sce
new file mode 100755
index 000000000..fe621f713
--- /dev/null
+++ b/1574/CH2/EX2.9/SCS_ex_2_9.sce
@@ -0,0 +1,12 @@
+clc;

+// Chapter 2 Switched communication systems

+//Example 2.9,page no 129

+//given

+N=5//no of switches

+A=0.9//traffic offered 

+//grade of service B=(A^N/N!)/(1+A+A^2/2!+A^3/3!+...+A^N/N!)

+//here

+B=(A^N/factorial(N))/(1+A+(A^2/factorial(2))+(A^3/factorial(3))+(A^4/factorial(4))+(A^5/factorial(5)))

+mprintf('grade of service is: %f\n',B)

+Tl=A*B//traffic lost

+mprintf('traffic lost is:%f',Tl)