Siemens GSM-R Cab Radio » History » Revision 19
Revision 18 (laforge, 01/23/2023 09:01 PM) → Revision 19/22 (laforge, 01/23/2023 09:05 PM)
{{>toc}} h1. Siemens GSM-R CAB Radio Osmocom has been provided with two ancient Siemens GSM CAB Radio devices, i.e. the kind of MS installed fixed into a train engine. {{thumbnail(20230123_184656.jpg)}} {{thumbnail(20230123_184637.jpg)}} h2. Sub-Rack Hardware {{thumbnail(20230123_184513.jpg)}} h3. Backplane At the back of the sub-rack there's a custom back-plane to interconnect the various modules {{thumbnail(20230123_183101.jpg)}} {{thumbnail(20230123_182917.jpg)}} h3. High Voltage Power Supply Module This is a fully encapsulated, passive cooled, DC/DC converter with * Input voltage 65..150V * Two output voltage rails of 12V / 4A {{thumbnail(20230123_183623.jpg)}} h3. 12V -> 5V DC/DC converter Module This is a circuit board that generates a 5V rail from 12V {{thumbnail(20230123_183545.jpg)}} {{thumbnail(20230123_183508.jpg)}} h3. GSM Modem Module This is a module implementing the actual GSM-R modem. It consts of two circuit boards: One digital and one analog/RF. {{thumbnail(20230123_184407.jpg)}} {{thumbnail(20230123_184419.jpg)}} {{thumbnail(20230123_184432.jpg)}} {{thumbnail(20230123_184452.jpg)}} h4. Digital Board {{thumbnail(20230123_184241.jpg)}} {{thumbnail(20230123_184021.jpg)}} {{thumbnail(20230123_184031.jpg)}} {{thumbnail(20230123_184051.jpg)}} {{thumbnail(20230123_184105.jpg)}} h4. RF Board {{thumbnail(20230123_184153.jpg)}} {{thumbnail(20230123_184143.jpg)}} {{thumbnail(20230123_184116.jpg)}} {{thumbnail(20230123_184003.jpg)}} {{thumbnail(20230123_183952.jpg)}} {{thumbnail(20230123_183940.jpg)}} h3. PC/104 embedded PC Module This is a carrier board hosting a PC/104 embedded x86 Mainboard. {{thumbnail(20230123_183800.jpg)}} h4. Carrier {{thumbnail(20230123_183641.jpg)}} {{thumbnail(20230123_183815.jpg)}} We can see this carrier interfacing with * the 8-bit lower portion of the ISA bus on the PC/104 connector * both of the UARTS of the SBC h4. PC/104 x86 SBC {{thumbnail(20230123_183714.jpg)}} {{thumbnail(20230123_183728.jpg)}} {{thumbnail(20230123_183747.jpg)}} h3. I/O board This is a board that brings signals from the backplane and frontplane and brings them to connectors towards the main connector panel. {{thumbnail(20230123_183235.jpg)}} {{thumbnail(20230123_183213.jpg)}} {{thumbnail(20230123_183139.jpg)}} {{thumbnail(20230123_183123.jpg)}} {{thumbnail(20230123_183252.jpg)}} {{thumbnail(20230123_161713.jpg)}} {{thumbnail(20230123_161719.jpg)}} We can see a number of SRDA05-6 TVS diode arrays as ESD protection measure, as well as some Datatronic LM201-1 signal transformers. h3. Audio PA + Relay board This board appears to contain an audio Power Amplifier {{thumbnail(20230123_183434.jpg)}} {{thumbnail(20230123_183356.jpg)}} {{thumbnail(20230123_183327.jpg)}} {{thumbnail(20230123_183316.jpg)}} {{thumbnail(20230123_183303.jpg)}} h3. Frontplane There's a board on the front side of the unit which interconnects the I/O board and the Relay / Audio PA board. {{thumbnail(20230123_183451.jpg)}} {{thumbnail(20230123_161142.jpg)}} h2. Handset Hardware The specific handset unit here was used for demo purposes ourside an actual train cab. So the auto-radio-looking user interface unit plus the receiver were mounted together with a 230V AC -> 110V DC power supply in an enclosure that you can connect to the subrack via two cables. {{thumbnail(20230123_211512.jpg)}} {{thumbnail(20230123_211445.jpg)}} {{thumbnail(20230123_211422.jpg)}} {{thumbnail(20230123_211413.jpg)}} {{thumbnail(20230123_211433.jpg)}} {{thumbnail(20230123_211501.jpg)}} h3. Internal Pictures {{thumbnail(20230123_210832.jpg)}} {{thumbnail(20230123_211353.jpg)}} {{thumbnail(20230123_211321.jpg)}} {{thumbnail(20230123_211306.jpg)}} h2. Connector pinout !20230123_184637.jpg! h3. EXT RADIO (DB-15 female) h3. SER I/O (DB-25 male) h3. HMI 1 (DB-25 female) This is the connector used to interconnect with the User Interface unit. HMI most likely means _Human Machine Interface_. h3. HMI 2 (DB-25 female) h3. MVB OUT (DB-9 female) This is internally wired 1:1 with the MVB IN connector. It likely contains an interface to the _Multifunction Vehicle Bus_ of the train. See https://en.wikipedia.org/wiki/Train_communication_network for details on MVB. h3. MVB IN (DB-9 female) h3. ANT (N) This a standdard 50-ohms N-type conector to connect to the GSM-R antenna. h3. PMU (DB-9 male) This connector is forwarded internally to the DB-9 connector on the front of the embedded PC. Probably serial console. h3. TRAIN POWER AND I/O (circular connector) |_.Pin (ext)|_.Internal Connector|_.Internal Connector Pin|_.Wire color|_.Purpose| |H|PL6|1|rose|| |K|PL6|2|white|| |M|PL6|3|green|| |P|PL6|4|purple|| |S|PL6|5|blue|| |J|PL6|6|black|| |L|PL6|7|red|| |N|PL6|8|yellow|| |R|PL6|9|orange|| |B|PL6|10|green|| |T|PL7|1|white|| |d|PL7|2|green|| |F|PL7|4|blue|| |A|PL7|5|red|| |U|PL7|6|rose|| |e|PL7|7|blue|| |G|PL7|9|grey|| |C|PL7|10|yellow|| |V|PL8|1|white|| |D|PL8|3|purple|| |W|PL8|4|red|| |E|PL8|6|orange|| |c|PL9|1|orange|| |Z|PL9|2|rose|| |X|PL9|3|green|| |b|PL9|4|grey|| |a|PL9|5|red|| |Y|PL9|6|yellow||