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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 9 : Data Transmission"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 2 : pg 349"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The efficiency is 70.0 %\n"
+     ]
+    }
+   ],
+   "source": [
+    " \n",
+    "# page no 349\n",
+    "# prob no 9.2\n",
+    "#calculate the efficiency\n",
+    "#given\n",
+    "Nd=7; N_start=1; N_stop=1.; N_parity=1;\n",
+    "#calculations\n",
+    "Nt= Nd + N_start+ N_stop + N_parity;\n",
+    "efficiency=Nd/Nt *100;\n",
+    "#results\n",
+    "print 'The efficiency is',efficiency,'%'"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 6 : pg 358"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "5 hammming bits are required\n"
+     ]
+    }
+   ],
+   "source": [
+    " \n",
+    "# page no 358\n",
+    "# prob no 9.6\n",
+    "#calculate the no. of hamming bits\n",
+    "#given\n",
+    "m=21.;\n",
+    "#calculations and results\n",
+    "# The correct number of check bits is the smallest number that satisfy the equation 2**n  >= m+n+1;\n",
+    "for n in range (1,10): # we choose range of 1 to 10\n",
+    "    a=m+n+1;\n",
+    "    b=2**n;\n",
+    "    if(b>=a):\n",
+    "        print n,'hammming bits are required'\n",
+    "        break;\n",
+    "    "
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}