Mesh Telephony

• Complementary to Towers and Satellites
• 2.4Ghz
• 868 MhZ
• FCC and
• licensing is national
• ISM 915 MhZ - available in enough countries
• WiFi was illegal in many countries before large user base
• $1/4M for a single tower in africa - defending tower and diesel generator
• Key: vast majority of calls are in local areas
• Store and forward - Serval rhizome
• Single house for WiFi
• For 10 house range - 1% of people need to be on
• 10kb codec 2 1400 bps for clear voice - CODEC2, 175bytes per second with no interframe compression

Cost

• $100-300 cost

Applications

• Mesh phone - medical diagnostic. Remote hospital.
  • Open MRS
  • pulse-oxy - $1-10
  • imaging ultrasound
  • bloodpressure cuff < $100
  • imaging ultrasound = ? <$500