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Principles of Cellular Telephony

Principles of Cellular Telephony. Advanced Mobile Phone Service AMPS Bellevue Community College Bob Young, Instructor. AMPS. Advanced Mobile Phone Service. Terminology. Common terms and abbreviations. MTSO. Mobile Telephone Switching Office Later, called the MSC, or

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Principles of Cellular Telephony

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  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.

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