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+// Example 6.2, page no-230
+clear
+clc
+t=20       //TDMA frame length in ms
+lc=352     //length of carrier and clock recovery frequency in bits
+lu1=48     //length of unique word in bits
+lo=510     //length of order wire channel in bits
+lm= 256    //length of management channel in bits
+lt=320     // length of transmit timming channel in bits
+ls1=24     // length of service channel in bits
+gt=64      // Guard time in bits
+rb=2       // reference burst
+br=90*10^6 //burst bit rate 90Mbps
+
+bfr=br*t*10^-3
+lr=lc+lu1+lo+lm+lt
+tb=lc+lu1+lo+ls1
+tob=(lr*rb)+(tb*t)+((t+rb)*gt)
+feff=(bfr-tob)*100/bfr
+feff=ceil(feff*100)/100
+printf("Frame efficiency = %.2f%%",feff)