Septets to Octets How To
The message “ratheesh” consists of 8 characters, called septets when represented by 7 bits each. These septets need to be transformed into octets for the SMS transfer.
ASCII BINARY OTECTS
r 114 – 1110010 1110010 11110010 F2
a 97 – 1100001 1100001 00110000 30
t 116 – 1110100 1110100 00011101 1D
h 104 – 1101000 1101000 01011101 5D
e 101 – 1100101 1100101 00101110 2E
e 101 – 1100101 1100101 11001111 CF
s 115 – 1110011 1110011 11010001 D1
h 104 – 1101000 1101000
The first septet (r) is turned into an octet by adding the rightmost bit of the second septet. This bit is inserted to the left which yields 1 + 1110010= 11110010 (“F2″). The rightmost bit of the second character is then consumed, so the second character (septet) needs two bits (bold character) of the third character to make an 8bit octet. This process goes on and on yielding the following octets:
F2 30 1D 5D 2E CF D1