- Table of contents
- Siemens GSM-R CAB Radio
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.
Sub-Rack Hardware¶
Backplane¶
At the back of the sub-rack there's a custom back-plane to interconnect the various modules
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
12V -> 5V DC/DC converter Module¶
This is a circuit board that generates a 5V rail from 12V
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.
Digital Board¶
RF Board¶
PC/104 embedded PC Module¶
This is a carrier board hosting a PC/104 embedded x86 Mainboard.
Carrier¶
We can see this carrier interfacing with- the 8-bit lower portion of the ISA bus on the PC/104 connector (J40)
- COM1 (J4)
- COM2 (J41)
- COM3 (J50)
- COM4 (J49)
- Utility (J27) Mouse/Keyboard/Reset/Speaker
PC/104 x86 SBC¶
This is a swiss-made Digital-Logic MSM586SEV.- 586 compatible processor (AMD ELAN520) @ 133 MHz
- ELAN520 data sheet: 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
- Data sheet: Microspace_Digital_Logic_MSM586SEN_Datasheet2_201872793522.pdf
- Manual: Microspace_Digital_Logic_MSM586SEN_Manual_201872793522.pdf
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.
We can see a number of SRDA05-6 TVS diode arrays as ESD protection measure, as well as some Datatronic LM201-1 signal transformers.
Audio PA + Relay board¶
This board appears to contain an audio Power Amplifier
Frontplane¶
There's a board on the front side of the unit which interconnects the I/O board and the Relay / Audio PA board.
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.
Internal Pictures¶
Connector pinout¶
EXT RADIO (DB-15 female)¶
SER I/O (DB-25 male)¶
HMI 1 (DB-25 female)¶
This is the connector used to interconnect with the User Interface unit. HMI most likely means Human Machine Interface.
HMI 2 (DB-25 female)¶
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.
MVB IN (DB-9 female)¶
ANT (N)¶
This a standdard 50-ohms N-type conector to connect to the GSM-R antenna.
PMU (DB-9 male)¶
This connector is forwarded internally to the DB-9 connector on the front of the embedded PC. Probably serial console.
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 |
Updated by laforge over 1 year ago · 22 revisions