Siemens GSM-R Cab Radio » History » Revision 21
Revision 20 (laforge, 01/23/2023 09:18 PM) → Revision 21/22 (laforge, 01/23/2023 09:22 PM)
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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.
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h2. Sub-Rack Hardware
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h3. Backplane
At the back of the sub-rack there's a custom back-plane to interconnect the various modules
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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
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h3. 12V -> 5V DC/DC converter Module
This is a circuit board that generates a 5V rail from 12V
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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.
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h4. Digital Board
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h4. RF Board
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h3. PC/104 embedded PC Module
This is a carrier board hosting a PC/104 embedded x86 Mainboard.
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h4. Carrier
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We can see this carrier interfacing with
* the 8-bit lower portion of the ISA bus on the PC/104 connector (J4)
* COM1 (J4)
* COM2 (J41)
* COM3 (J50)
* COM4 (J49)
* Utility (J27) Mouse/Keyboard/Reset/Speaker
both of the UARTS of the SBC
h4. PC/104 x86 SBC
This is a swiss-made Digital-Logic MSM586SEV.
* 586 compatible processor (AMD ELAN520) @ 133 MHz
** ELAN520 data sheet: attachment:22004b.pdf
* 32 MByte SO-DIMM memory
* 16 MByte M-Systems DiskOnChip MD-2202-D16
* 4x UART / COM port
* 1x parallel port
* 1x RTC
* AT-keyboard, PS/2, Floppy, IDE interface
* PC/104 bus
Resources:
* Data sheet: attachment:Microspace_Digital_Logic_MSM586SEN_Datasheet2_201872793522.pdf
* Manual: attachment:Microspace_Digital_Logic_MSM586SEN_Manual_201872793522.pdf
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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.
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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
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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.
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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.
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h3. Internal Pictures
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h2. Connector pinout
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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||
