• _Basics
  • _{UART(universal asynchronous receiver transmitter), what is it? where is it?}
  • _{serial port pin, how is a signal conveyed?}
  • _{how is the signal transported to the modem?}
• _{Walk through a conversation between two modems. fig 2-7 (page 39)}
  • _{note use of each pin (refer to fig 2-5 on page 38 for decode)}