NEC UX5000 Hardware Manual page 214

Chapter 4 - Telephones and Optional Equipment
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Unplug the keyset completely: line cord, LAN cable, and any power adapter which may be
connected to the keyset.
Lower the legs of the keyset if they are raised.
On the bottom of the telephone, remove the connector cover for the bottom
option interface.
Install the adapter on the bottom of the telephone.
Return the telephone to an upright position and reconnect all the cables.
Plug the line cord back into the keyset.
Plug the end of the line cord for the analog device into the jack on the adapter. The opposite
end should then be connected to the analog device.
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To avoid any hardware problems, when removing the adapter, first unplug the line cord,
then the power cord, then any other adapter cables.
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The analog device should be placed no greater than 15 meters away from the keyset.
Chapter 4