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M 3900 description Page 153 of 504
Telephones and Consoles Description, Installation, and Operation
For Full Duplex Handsfree functionality, you require an M3904 Phase III set
equipped with an FDHF cartridge.
Note: Phase III hardware is required since design modifications were
made to theM3900 Series Digital Telephones to accommodate the FDHF
functionality.
The FDHF functionality requires the following hardware (minimum vintages
listed):
• M3904 Phase III set (NTMN34GA)
Note: NTMN34TA is the M3904 Phase III Icon set.
• Full Duplex Handsfree cartridge (NTMN72xx)
• Accessory Connection Module (ACM) (NTMN71xx)
• One of the following wall transformers to power the FDHF cartridge:
— 110 V wall transfer (NTMN80AA)
— EU (EMEA) 230 V wall transformer (NTHC09AA)
— UK 230 V wall transformer (NTHC08AA)
Meridian External Alerter and Recording Interface
The Meridian External Alerter and Recording Interface (MEARI) provides an
interface for a remote ringer device installed in a location separate from your
M3902, M3903, M3904, or M3905 telephone. The MEARI provides access
to a standard, off-the-shelf remote ringer, call status relay, audio recorder or
visual indicator.
You can program the MEARI to activate a ringer (or light) when the
telephone rings or when the telephone is in use (off hook). A call to any DN
configured on the telephone triggers the alerter. The MEARI alerts to one
active call at a time. If the telephone is already active on a call, a second call
will not activate MEARI.
If used on the M3904 in conjunction with the Full Duplex Handsfree
accessory, the MEARI can be used only for external alerting, not recording.