Hardware manual

Issue 8 Electra Elite
7 - 32 Installing Optional Equipment
3.8 HFU-U Unit (Handsfree Unit)
The Handsfree Unit provides full-duplex handsfree communication.
Large areas may cause poor full-duplex operation. This unit comes
with the handsfree adapter and an external microphone. With
terminal upside down, facing from the bottom of the open cover,
install this unit in Telephone Slot 1.
3.8.1 Installing an HFU-U Unit on any DTP/DTU Multiline
Terminal except DTP-2DT-1 and DTP-16HC-1
Refer to 3.4.1 Installing an APR-U Unit on any DTP/DTU
Multiline Terminal except DTP-2DT-1 and DTP-16HC-1
The instructions for installing these units are the same.
Figure 7-39 Connecting DBM(B)-U( ) to ESI Port
Figure 7-40 HFU-U Unit