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Multifunction Vehicle Bus
1
IEC Train Communication Network
IEC 61375 Clause 3
1999 September, HK
Train Communication Network
IEC 61375 - 3
Multifunction Vehicle Bus
This is the vehicle bus standardized in IEC 61375
for interconnecting rail vehicles
Introduction
Multifunction Vehicle Bus
2
IEC Train Communication Network
IEC 61375 Clause 3
1999 September, HK
MVB Outline
1. Applications in rail vehicles
2. Physical layer
1. Electrical RS 485
4. Frames and Telegrams
5. Medium Allocation
7. Fault-tolerance concept
8. Integrity Concept
2. Middle-Distance
3. Fibre Optics
9. Summary
3. Device Classes
6. Clock Synchronization
Multifunction Vehicle Bus
3
IEC Train Communication Network
IEC 61375 Clause 3
1999 September, HK
standard communication interface for all kind of on-board equipment
data rate
delay
medium
number of stations
> 600 vehicles in service in 1998status
up to 4095 simple sensors/actuators
1'500'000 bits/second
0,001 second
twisted wire pair, optical fibres
up to 255 programmable stations
Multifunction Vehicle Bus in Locomotives
cockpit
power line
diagnosis
radio
Train Bus
motor controlpower electronicsbrakes track signals
Vehicle Bus
Multifunction Vehicle Bus
4
IEC Train Communication Network
IEC 61375 Clause 3
1999 September, HK
Multifunction Vehicle Bus in Coaches
covered distance:
> 50 m for a 26 m long vehicle
< 200 m for a train set
diagnostics and passenger information require relatively long, but infrequent messages
brakes
air conditioning
doors
power
light
passenger
information
seat reservation
Vehicle Bus
Train Bus
Multifunction Vehicle Bus
5
IEC Train Communication Network
IEC 61375 Clause 3
1999 September, HK
MVB Physical Media
• OGF
• EMD
• ESD
Media are directly connected by repeaters (signal regenerators)
All media operate at the same speed of 1,5 Mbit/s.
(2000 m)
(200 m)
(20 m)
optical fibres
shielded, twisted wires with transformer coupling
wires or backplane with or without galvanic isolation
twisted wire segment
sensors
optical links
rack
optical links
rack
star coupler
devices
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