Comtech EF Data SDM-100A - Manual (Page 20)

Introduction SDM-100A Satellite Modem
1–4 Rev. 0
Figure 1-3. Dimensional Drawing
1.3 Options
For more information on the following options, refer to Appendix B.
1.3.1 ASYNC/AUPC Interface
The ASYNC interface board provides the interface for terrestrial data and a single
ASYNC overhead channel, along with an AUPC feature.
1.3.2 ADPCM Voice
The ADPCM voice interface is capable of providing a single, duplex voice channel and
Ear and Mouth (E&M) signaling data transmission.