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DTM-3237B – DVB-S2X Receiver with DVB-ASI Output
User Manual
1. Introduction
1.1 General description
The DTM-3237B is a compact OEM module for receiving DVB-S2 or DVB-S and outputting it as
DVB-ASI. The DTM-3237B can supply LNB power and has support for sending and receiving DiSEqC
control messages. The transponder details and the output format can be configured programmatically
through several control interfaces.
A development kit (DTM-3237B-DEVKIT; refer to Appendix B) is available for easy setup and
experimentation with the DTM-3237B.
1.2 Input Modes
The DTM-3237B supports all functionality described in EN 300 421 (DVB-S), EN 302 307 (DVB-S2)
and EN 302 307-2 (DVB-S2X). All DVB-S2 modulation types can be demodulated: QPSK, 8PSK,
16/32APSK. The DTM-3237B supports advanced DVB-S2 features including VCM, ACM, Multiple
Input Streams (MIS) and Generic Stream (GS).
1.3 Output Modes
The DTM-3237B outputs the received DVB-S, DVB-S2 or DVB-S2X stream through a Transport Stream
over DVB-ASI.
1.4 Control and Management
The DTM-3237B provides options for control through either USB or I
stored in non-volatile memory if the "Volatile Storage" option is set to '1'. This ensures that
configurations are retained even after power cycling. However, do note that storing settings in non-
volatile memory incurs a slight time delay and is subject to a lifetime limit on write cycles.
If "Volatile Storage" is set to '0', setting changes take immediate effect but will not be retained when
the power is cycled.
There are three control mechanisms for the DTM-3237B:
1. USB Control from a Development PC. Employ the specialized control software—either
Dtm3237BUtil or DtmCmd—on a development PC connected to the DTM-3237B via a USB
interface. This is particularly useful for initial configuration or experimenting and tweaking of
the DTM-3237B.
Figure 1. The PCB of the DTM-3237B
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C. Settings can be persistently
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