Abstract: To accomplish bit synchronization the conventional technique in Telemetric System is to use the same frame synchronization codes derived from the control tation.But this is not so ideal a technique in practice.After a comparison of several typical design ideas it is concluded that the better choice is the method of"frame informationcarried by synchronization codes with information codes carrying bit information",which has been practiced in Intel 8273 HDLC/SDLC controller for a typical example. However,NRZ_I codes used in 8273 controller have some inherent drawbacks in carrying bit information.In our approach in stead of NRZ_I code system,we have used Miller code System,the full advantage of which has for long been being enjoyed in magnetic recording technique.The author has designed the encoding and decoding logic in terms of Miller codesystem.The resultant circuitry is quite simple and those drawbacks inherent in 8273 controller have been eliminated.It seems that this new approach will also be advantageous to similar design other than in telemetric systems.