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Intraplex VF-25 Voice Module Appendix A – MAs for VF-25 Voice Module
Version 7.1, November 2009
A-34 GatesAir, Inc.
Intraplex Products
A.2.5 MA-309 Two-Wire, 50-pin Connector
The MA-309 2-wire E&M interface module adapter provides 2-wire to 4-wire conversion for Intraplex
Products voice frequency channel modules with E&M type signaling. This adapter interfaces four
channels with 600  termination per channel. Audio frequency response is 300Hz to 3kHz +-0.5dB.
Nominal audio levels are 0dBm input, 0dBm output. Receive output levels of 0dBm, -3dBm and -
10dBm are selectable per channel as are E&M signaling of type I, II, III, and V. The MA-309 connects
to the T, R, E and M signaling leads using a 50 pin Amphenol 57-30500 (or equivalent) type
connector.
The MA-309 module adapter is used in conjunction with the VF-25, VF-25E (for PCM coding), VF-27,
and the VF-27E (for ADPCM coding) voice frequency channel modules for 2-wire applications.
Termination of impedance is 600  . Receive gain settings of 0dB, -3dB, and -10dB are selectable per
channel (Figure A-21).
Figure A-21. MA-309 Jumpers and Face Plate
A.2.5.1 Jumper Settings
Figure A-21 shows jumper locations on the MA-309 module adapter. Two sets control signaling and
one set controls output levels.
The first set of jumpers that control signaling is JMP1, JMP2, JMP3, and JMP4. The second set is JMP9,
JMP10, JMP11, and JMP12. These eight jumpers control the E&M signaling type used by the associated
voice channel:
● Jumpers 1 and 9 (JMP1 and JMP9) control the type of signaling for channel 1