Prerequisites; Operating Parameters - Nortel Meridian M3900 Reference Manual

Prerequisites

You must install an Accessory Connection Module (NTMN71AA) into
your M3904 set before you install the FDHF cartridge. The ACM
provides connection capabilities between the M3904 set and the FDHF
cartridge. Procedure 10 on page 75
instructions.
Procedure 38
Connect the FHDF cartridge
1 Look at the label on the back of the set to make sure that your set is an M3904
Release 3. For Release 3, the label shows NTMN34GA. If the set is not a
Release 3 vintage, the FDHF cartridge is not compatible. Contact your
network administrator for more information.
2 Insert the FDHF cartridge into the ACM. The latch must be at the top.
3 Plug the wall transformer into an electrical outlet (use only the transformer
designed for your ACM accessory). The following list shows the transformers
Nortel Networks approves for use with the FDHF 110V wall transformer
(NTMN80AA) cartridge.
4 Disconnect the telephone line cord from the telephone wall jack. This is
similar to the ATA (see Figure 2 on page 6).
5 Connect the Adapter plug, attached to your transformer, to the telephone wall
jack.
6 Connect the telephone line cord to the wall transformer adapter jack.
7 Verify that the FDHF cartridge is working properly. The cartridge is operating
properly when:
• the red LED on the cartridge is flashing, and
• the volume bar displays 18 segments during handsfree volume
adjustment.
Note: Half-duplex mode displays only 12 segments.

Operating parameters

The M3904 set attenuates the receive audio level when in FDHF mode
while both you and the other party are conversing; therefore, you can
notice fluctuations in the receive volume during a FDHF call.
During a call, you can remove or insert the FDHF cartridge into the
ACM without interrupting the established call. If you remove the FDHF
cartridge, the set returns to half-duplex operation.
Meridian SL-100 M3900 Meridian Digital Telephones Reference Guide
provides ACM installation
This procedure is now complete
Installation 99