Quantcast FIGURE 1-2. MODEM: TYPICAL CONFIGURATION FOR DUPLEX LANDLINE (600 OHMS) TELETYPEWRITER SYSTEM

 

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Page Title: FIGURE 1-2. MODEM: TYPICAL CONFIGURATION FOR DUPLEX LANDLINE (600 OHMS) TELETYPEWRITER SYSTEM
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FIGURE 1-1. MODEM: TYPICAL CONFIGURATION FOR DUPLEX RADIO TELETYPEWRITER  SYSTEM
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TM-11-5805-387-20-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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FIGURE 1-3. MODEM: TYPICAL CONFIGURATION FOR PONY OPERATION
TM 11-5805-387-20-2
FIGURE 1-2. MODEM: TYPICAL CONFIGURATION FOR DUPLEX LANDLINE (600 OHMS)
TELETYPEWRITER SYSTEM
1 Teletypewriter [tty (SEND)] dc mark and space pulses are sensed by the modem.
2 Voice signals from the microphone are routed through the modem for switching purposes.
3 The modem converts the tty SEND mark and space pulses to tty tones.
4 These tones and voice signals are applied to an isolation amplifier, which provides impedance
matching for transmission over telephone lines to a distant station.
5 When received, an isolation amplifier again provides impedance matching. The received signals
are applied to the modem. The tty tones are converted into tty dc puIses.
6 The tty pulses are applied to a teletypewriter [tty (RCV)] and applied to page printers or tape
punches for message interpretation.
7 An audio output can be applied to a speaker for local use.
1-4

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