AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual page 108

Hardware Components
Multi-Function Module
The Multi-Function Module (MFM) is an optional adapter for connecting tip/ring
(T/R) or supplemental alert adjuncts to any MLX telephone. The MFM is a circuit
board that mounts inside the telephone. Adjuncts plug into a modular jack on
the MFM. The MFM is the only T/R adapter used with MLX telephones.
NOTE:
An MFM cannot be used in an MLX-20L telephone serving as a QCC.
Figure 2-13. Multi-Function Module
WARNING:
The MFM can be installed or repaired only by a qualified technician or
an authorized dealer representative. To eliminate the risk of electrical
shock, the MLX telephone should not be disassembled.
T/R adjuncts operate independently of the MLX telephone. If the telephone is in
use, voice or data calls can
allows the use of the following T/R adjuncts:
2-34 Adapters and Adjuncts
Multi-Function Module
still be sent and received by the adjunct. The MFM