1. Principles of Cellular Telephony Advanced Mobile Phone Service AMPS Bellevue Community College Bob Young, Instructor

2. AMPS Advanced Mobile Phone Service

3. Terminology Common terms and abbreviations

4. MTSO Mobile Telephone Switching Office Later, called the MSC, or Mobile Switching Center

5. Cell Site Later, called the base station

6. The Phone Mobile Mobile Station Portable Handset

7. Digital Signaling Frequency Shift Keying: +/- 8KHz 10 Kbps rate Primarily on control channel Secondarily on voice channel

8. Supervisory Audio Tone SAT 5970 Hz 6000 Hz 6030 Hz Originates from cell site Repeated back by handset

9. Signaling Tone ST 10 KHz Originates from handset

10. Downlink From the cell site to the mobile Imagine looking down from the tower Forward link

11. Uplink From the mobile to the cell site Imagine looking up from the handset to the antenna on the tower Reverse link

12. Preparing Audio Signals Compander -- 2:1 compression Pre-emphasis -- 6 dB per octave Limiter -- limits amplitude so deviation won't exceed +/- 12 KHz peak to peak Low pass filter -- audio cutoff at 3KHz Inject the Supervisory Audio Tone (SAT) No vocoder

13. Mobile Identifiers Mobile Identification Number (MIN) (phone number) Electronic Serial Number (ESN) unique to each phone Station Class Mark (SCM) identifies phone features and capabilities to the system

14. System/Base Station Identifiers System ID (SID) Supervisory Audio Tone (SAT) Digital Color Code (DCC)

15. Channels Forward Control Channel (FOCC) Reverse Control Channel (RECC) Forward Voice Channel (FVC) Reverse Voice Channel (RVC)

16. Handoff Controlled by the base stations and MTSO "Break before make" Between cells or sectors Between systems "Blank and burst" signaling on FVC

17. Channels 832 Channels 416 channels per carrier (A & B) 21 control channels per carrier 395 voice channels per carrier Channels are 1-799 & 991-1023

18. Carriers A = was non-wireline B = was wireline Now you can own both, but only one in a market.