Comtech EF Data SDM-650B - Manual (Page 16)

Table of Contents SDM-650B Satellite Modem
xii Rev. 5
B.1.4.16 Bulk Consolidated Status Faults ................................................................................................ B–30
B.1.4.17 Change Status ............................................................................................................................ B–31
B.1.4.18 Equipment Type......................................................................................................................... B–32
B.2 Asynchronous Overhead Interface Support Option ............................................................................. B–33
B.2.1 General ................................................................................................................................................ B–33
B.2.2 Message Structure ............................................................................................................................... B–33
B.2.2.1 Start Character ............................................................................................................................. B–34
B.2.2.2 Device Address............................................................................................................................ B–34
B.2.2.3 Command/Response .................................................................................................................... B–35
B.2.2.4 End Character .............................................................................................................................. B–35
B.2.3 Modulator Configuration Commands ................................................................................................. B–36
B.2.3.1 Set Modulator Frequency............................................................................................................. B–36
B.2.3.2 Set RF Output .............................................................................................................................. B–36
B.2.3.3 Set Modulator Power Offset ........................................................................................................ B–36
B.2.3.4 Set Modulator Output Power Level ............................................................................................. B–37
B.2.3.5 Modulator Rate ............................................................................................................................ B–38
B.2.3.5.1 Modulator Filter Rate Assignment ....................................................................................... B–38
B.2.3.5.2 Select Modulator Rate .......................................................................................................... B–39
B.2.3.5.3 Select Modulator Rate Variable ........................................................................................... B–39
B.2.3.6 Scrambler Enable......................................................................................................................... B–39
B.2.3.7 Differential Encoder Enable ........................................................................................................ B–40
B.2.4 Demodulator Configuration Commands ............................................................................................. B–40
B.2.4.1 Set Demodulator Frequency ........................................................................................................ B–40
B.2.4.2 Demodulator Rate ........................................................................................................................ B–40
B.2.4.2.1 Demodulator Filter Rate Assignment ................................................................................... B–41
B.2.4.2.2 Select Demodulator Rate...................................................................................................... B–41
B.2.4.2.3 Select Demodulator Rate Variable ....................................................................................... B–41
B.2.4.3 Descramble Enable ...................................................................................................................... B–42
B.2.4.4 RF Loopback ............................................................................................................................... B–42
B.2.4.5 IF Loopback................................................................................................................................. B–42
B.2.4.6 BER Threshold ............................................................................................................................ B–42
B.2.4.7 Sweep Reacquisition.................................................................................................................... B–43
B.2.4.8 Fast Acquisition Mode................................................................................................................. B–43
B.2.4.8.1 Sweep Center Frequency...................................................................................................... B–44
B.2.4.8.2 Sweep Width Range ............................................................................................................. B–44
B.2.4.8.3 Sweep Direction ................................................................................................................... B–45
B.2.5 Interface Configuration Commands .................................................................................................... B–45
B.2.5.1 Transmit Clock ............................................................................................................................ B–45
B.2.5.2 Buffer Clock ................................................................................................................................ B–45
B.2.5.3 Receive Clock.............................................................................................................................. B–46
B.2.5.4 External Reference Frequency..................................................................................................... B–46
B.2.5.5 Interface Loopback ...................................................................................................................... B–46
B.2.5.6 Baseband Loopback..................................................................................................................... B–46
B.2.5.7 Interface Coding Format Transmit............................................................................................... B–47
B.2.5.8 Interface Coding Format Receive ................................................................................................ B–47
B.2.5.9 Interface Buffer Center ................................................................................................................ B–47
B.2.5.10 Interface Buffer Size.................................................................................................................. B–47
B.2.5.11 Transmit Overhead Baud Rate................................................................................................... B–48
B.2.5.12 Receive Overhead Baud Rate .................................................................................................... B–48
B.2.5.13 Overhead Channels Character Length ....................................................................................... B–48
B.2.5.14 Overhead Channels Stop Bits .................................................................................................... B–48
B.2.5.15 Overhead Channels Parity ......................................................................................................... B–49
B.2.5.16 Interface Substitution Pattern (Transmit 2047 Pattern) ............................................................. B–49