GatesAir Intraplex VF-25, Installation And Operation Manual

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Appendix A – MAs for VF-25 Voice Module Intraplex VF-25 Voice Module
Version 7.1, November 2009
GatesAir, Inc. A-11
Intraplex Products
2. Once it is seated securely, secure the unit with screws provided.
3. Plug the connector into the adapter.
A.1.5 MA-309C Two-Wire, 50-pin Connector
The MA-309C 2-wire E&M interface module adapter provides 2-wire to 4-wire conversion for Intraplex
Products voice frequency channel cards 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 E&M signaling of type I, II, III, and V. The MA-309C connects to the T, R, E,
and M signaling leads using a 50-pin Amphenol 57-30500 (or equivalent) type connector.
The MA-309C 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 cards for 2-wire applications. Termination
of impedance is 600
 . Receive gain settings of 0dB, -3dB, and -10dB are selectable per channel
(Figure A-7).
Figure A-7. MA-309C Jumpers and Face Plate
A.1.5.1 Jumper Settings
Figure A-8 shows jumper locations on the MA-309C 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: