Comtech EF Data SDM-650B - Manual (Page 12)

Table of Contents SDM-650B Satellite Modem
viii Rev. 5
3.1.1.7 Utility Defaults ................................................................................................................................3–5
3.1.2 Remote Interface Specification...............................................................................................................3–6
3.1.3 M&C Theory of Operation .....................................................................................................................3–6
3.2 Digital Interfaces ..........................................................................................................................................3–7
3.2.1 RS-422 and MIL-STD-188-114 Interface ..............................................................................................3–7
3.2.1.1 Functional Description ....................................................................................................................3–7
3.2.1.2 Connector Pinouts .........................................................................................................................3–12
3.2.1.3 Specification..................................................................................................................................3–13
3.2.2 V.35 Interface .......................................................................................................................................3–14
3.2.2.1 Functional Description ..................................................................................................................3–14
3.2.2.2 Connector Pinouts .........................................................................................................................3–18
3.2.2.3 Specification..................................................................................................................................3–19
3.2.3 DS-1 Interface.......................................................................................................................................3–20
3.2.3.1 Functional Description ..................................................................................................................3–20
3.2.3.2 Connector Pinouts .........................................................................................................................3–23
3.2.3.3 Specification..................................................................................................................................3–23
3.2.4 G.703, 2048 kbit/s Interface .................................................................................................................3–24
3.2.4.1 Functional Description ..................................................................................................................3–24
3.2.4.2 Optional EXT CLK .......................................................................................................................3–26
3.2.4.3 Switch Configuration for G.703 2048 kbit/s Interface..................................................................3–27
3.2.4.4 Connector Pinouts .........................................................................................................................3–27
3.2.4.5 G.703 2048 kbit/s Connector Board Option..................................................................................3–28
3.2.4.6 External Reference (J3) .................................................................................................................3–30
3.2.4.7 Send Data (J4) ...............................................................................................................................3–30
3.2.4.8 Receive Data (J5) ..........................................................................................................................3–30
3.2.4.9 Specification..................................................................................................................................3–31
3.2.5 Asynchronous Overhead Interface........................................................................................................3–31
3.2.5.1 Functional Description ..................................................................................................................3–31
3.2.5.2 Terrestrial Interface .......................................................................................................................3–32
3.2.5.3 Multiplexer ....................................................................................................................................3–35
3.2.5.4 Demultiplexer................................................................................................................................3–35
3.2.5.5 Plesiochronous Buffer ...................................................................................................................3–36
3.2.5.6 Remote Interface Specification .....................................................................................................3–36
3.2.5.7 Interface Connector Pinouts ..........................................................................................................3–37
3.2.5.8 Asynchronous Interface Specifications .........................................................................................3–38
3.2.6 Asynchronous Breakout Panel..............................................................................................................3–39
3.3 Doppler Buffer............................................................................................................................................3–40
3.3.1 Buffer Setup..........................................................................................................................................3–44
3.3.1.1 Buffer Size.....................................................................................................................................3–46
3.3.1.2 Doppler..........................................................................................................................................3–46
3.3.1.3 Plesiochronous ..............................................................................................................................3–47
3.3.1.4 Frame/Multiframe Length .............................................................................................................3–47
3.3.1.5 Total Buffer Length.......................................................................................................................3–48
3.3.1.6 Converting.....................................................................................................................................3–48
3.4 Doppler Buffer Specification.....................................................................................................................3–49
3.5 I/O Connectors ...........................................................................................................................................3–49
3.6 Interface Clocking Options .......................................................................................................................3–50
3.6.1 Master/Slave .........................................................................................................................................3–50
3.6.1.1 Master/Slave RS-422 or V.35 .......................................................................................................3–51