AASTRA 7433ip for MX-ONE User Guide EN - Manual (Page 25)

IP P HONE FOR MX-ONE™
25 6/1553-DBC 433 01 Uen D 2012-02-22
• Busy Signal. The busy signal is activated in off-hook mode.
Can be used to control a Do-not-disturb lamp at the door.
• Extra Bell. The extra bell is activated parallel to the ring
signal.
• Combined Bell/Busy. A combined busy signal and extra bell.
Steady active in off-hook mode, and flashing when the phone
rings. Can be used for lamp indication in an office landscape,
for example.
2.10.1 Installing an Option Unit
To install the option unit, do the following:
1. Log off the phone and disconnect the power from the phone to
avoid electrostatic discharges, ESD.
2. Connect the ribbon cable to the phone, making sure the cable does
not get stuck.
3. Attach the option unit at the arrows on the back of the phone. Press
until you hear a click sound.
Note: Avoid touching the contacts when you connect the ribbon cable.
4. Connect the cables to the option unit and attach the rubber piece
as showed in the figure below.
Apart from the PC and LAN cables, you need connect the auxiliary
cable for an extra bell or busy lamp.