Key System US Atlas IIE KSX 32i, Installation Manual

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6.39. Before connecting the Keyphone to the modular jack, check for the correct voltage
(24 Volt) across the black and yellow terminals on each modular jack assembly.
(Refer to Figure 10)
WARNING! If the black and yellow pair is reversed, the Keyphone will not function.
6.40. Install the Keyphones by plugging the 1.8 m (12 foot) base cord into the back of the
Keyphone and also into the modular wall jack assembly.
Note: If the Keyphone is equipped with an LCD display then the day, date, time, and
station number will appear on the display.