FIGURE 88. Phantom Teletypewriter
FIGURE 87. Simplexed Teletypewriter
Circuit (Ground Return)
The Simplexed Teletypewriter Phantom Telephone Circuit.
You can have three telephone circuits and one teletypewriter circuit in operation at the same time using only
two pairs of line wires and a ground return for the teletypewriter circuit (fig. 89). This is done by adding a simplexed
teletypewriter circuit to a phantom telephone circuit. In this case the third telephone circuit between the line side circuits
in the phantom circuit.