1-14. BASIC HIGH-LEVEL TELETYPEWRITER SYSTEM
ulses sent from either sending contact operates selector magnets in both teletypewriters. Both teletypewriters can
send and receive. Additional teletypewriters, sending units and/or receiving units can be added to this system, if needed.
1-15. BASIC LOW-LEVEL TELETYPEWRITER SYSTEM
ark (negative) and space (positive) pulses are made at sending TELETYPEWRITER A by closing and opening the
sending contacts. The transmitter module turns these closings and openings into 6 volt polar signals and applies them to
the signal lines. These polar signals are received by TELETYPEWRITER B receiver module and processed through the
selector magnet driver to the selector magnet.
oth teletypewriters are equipped with send and receive components but full two-way communication would require four
signal lines and transmitters and receivers interconnected. Additional receiving units may be connected to a sending unit
on a parallel basis only.