ACS - Exam-Example an der TU München

Karteikarten und Zusammenfassungen für ACS - Exam-Example an der TU München

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Lerne jetzt mit Karteikarten und Zusammenfassungen für den Kurs ACS - Exam-Example an der TU München.

Beispielhafte Karteikarten für ACS - Exam-Example an der TU München auf StudySmarter:

Assignment 4 (CAN) (appr. 14%)


a) Which media access control method is used in the CAN Bus ?




Beispielhafte Karteikarten für ACS - Exam-Example an der TU München auf StudySmarter:

Assignment 1 (Communication) (appr. 8%)


b) Describe the „physical layer“ of the OSI layer model.


Beispielhafte Karteikarten für ACS - Exam-Example an der TU München auf StudySmarter:

Assignment 1 (Communication) (appr. 8%)


c) Describe the „data-link layer“ of the OSI layer model.

Beispielhafte Karteikarten für ACS - Exam-Example an der TU München auf StudySmarter:

Assignment 8 (TCP/IP) (appr. 12%)


e) Ethernet is not suitable for transmitting safety critical data. Which properties are not fulfilled in Ethernet that are required for the transmission of safety critical data ?


Beispielhafte Karteikarten für ACS - Exam-Example an der TU München auf StudySmarter:

Assignment 5 (Flexray) (appr. 15%)


c) Describe the characteristics of the Flexray Bus system.

Beispielhafte Karteikarten für ACS - Exam-Example an der TU München auf StudySmarter:

Assignment 4 (CAN) (appr. 14%)


b) When do you see a remote frame on the CAN Bus?


Beispielhafte Karteikarten für ACS - Exam-Example an der TU München auf StudySmarter:

Assignment 8 (TCP/IP) (appr. 12%)


f) Which mechanisms can be introduced in Ethernet networks to transmit safety critical data ?


Beispielhafte Karteikarten für ACS - Exam-Example an der TU München auf StudySmarter:

Assignment 9 (Diagnose) (appr. 9%)


a) Which different methods of addressing are used in diagnostic communication ?



Beispielhafte Karteikarten für ACS - Exam-Example an der TU München auf StudySmarter:


Assignment 4 (CAN) (appr. 14%)


e) Which error detection checks are carried on the CAN Bus?


     1) On Frames



      2) On Bit level



Beispielhafte Karteikarten für ACS - Exam-Example an der TU München auf StudySmarter:

Assignment 6 (MOST) (appr. 16%)


c) Which error handling is realized in the synchronous Channel of the MOST bus system ?


Beispielhafte Karteikarten für ACS - Exam-Example an der TU München auf StudySmarter:

Assignment 5 (Flexray) (appr. 15%)


a) Describe the following term in relation to time synchronization.


1) Offset correction



2) Drift Correction




Beispielhafte Karteikarten für ACS - Exam-Example an der TU München auf StudySmarter:

Assignment 6 (MOST) (appr. 16%)


a) Which topology is used in the MOST Bus System?


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Beispielhafte Karteikarten für ACS - Exam-Example an der TU München auf StudySmarter:

ACS - Exam-Example

Assignment 4 (CAN) (appr. 14%)


a) Which media access control method is used in the CAN Bus ?




CSMA/CA – Carrier Sense Multiple Access / Collision Avoidance

____________________

Through this method the arbitration is done, while the data is transmitted by observing the actual bit on the bus and the bit being transmitted, at that point the respective node losing priority will stop transmission.

ACS - Exam-Example

Assignment 1 (Communication) (appr. 8%)


b) Describe the „physical layer“ of the OSI layer model.


Signals over the physical cable to Databits. In that way the information over the transport medium is prepared for the upper layer (Data Link Layer). In most of the cases a transceiver is used to achieved that.

The OSI Layers:

<put the photo>

ACS - Exam-Example

Assignment 1 (Communication) (appr. 8%)


c) Describe the „data-link layer“ of the OSI layer model.

Data bits to frames. The bits comming from the under layer (Transport layer) are organized in frames, so they can passed to the upper layer (Network layer).

Here, it’s needed the physical address of the devices where the medium access control takes place.

The OSI Layers:

<put the photo>

ACS - Exam-Example

Assignment 8 (TCP/IP) (appr. 12%)


e) Ethernet is not suitable for transmitting safety critical data. Which properties are not fulfilled in Ethernet that are required for the transmission of safety critical data ?


[ Requirements:

+Guaranteed transmission time. (Reliability)

+Less invariance of the transmission time. (No Jitter)

]

Those are no fulfilled in Ethernet cause: 

  • Non deterministic data transfer. After a collision, the node waits a random time interval to sent the packet again.
  • Prone to electromagnetic interference (EMI), corrupted packages.

___________________________________

  • No provision for redundancy.
  • (Non error management on a bit level.)

ACS - Exam-Example

Assignment 5 (Flexray) (appr. 15%)


c) Describe the characteristics of the Flexray Bus system.

(Requirements resulting of X-by Wire)

  • Capability for redundant communication channels.
  • Deterministic bus access. (max. Latency)
  • Guaranteed transmission with minimum time invariance (Jitter!)
  • Collision free bus access
  • Optional geometric redundancy (via network topology.

___________________________

Further information:  these characteristics comes from –>>

It uses as centralized medium acces control a time slice method, that is TDMA – Time Division Multiple Access.

ACS - Exam-Example

Assignment 4 (CAN) (appr. 14%)


b) When do you see a remote frame on the CAN Bus?


When a node (ECU) needs certain information (message/an specific identifier) from another ECU, it asks for it through a remote frame.

[A station acting as a receiver can initiate the transmission of the respective data by its source by sending a Remote Frame]

____________________________

____________________________

Frames:

  • Data Frame: A frame containing node data for transmission.
  • Remote Frame: A frame requesting the transmission of a specific identifier (certain info.)
  • Error Frame: A Frame transmitted by any node detecting an error.
  • Overload frame: A frame to inject a delay between data and/or remote frame.

ACS - Exam-Example

Assignment 8 (TCP/IP) (appr. 12%)


f) Which mechanisms can be introduced in Ethernet networks to transmit safety critical data ?


[if we want to eliminate those Jitter what can we do?

The Idea is to look for the usage of the network, but not in a dynamic way, that is not during run time, but during the design phase. Because we have safety critical data and we have to be sure it works correctly.

So we would look for that usage, and try to implement some kind of TDMA, so give time schedules to individual nodes, in order to implement the timing we can use messages that start in certain time cycle, based in some time table, controlling the number of messages sent on the network. 

So we can assure that there are no more messages sent than the system can handle. Which again requires the nodes to monitor the amount of data that their are sending. So they should manage the access to the network. (access manager to the network)

At the end is create a whole new mechanism.

]

_________________________________

Check how many packages were lost, and then estimate how much the data was damaged.

(It’s valid but we need a more control way to organised the data traffic in the medium, for safety critical systems, it’s better to shift this methods in the design phase of the system, non in the actual run time of the system)

ACS - Exam-Example

Assignment 9 (Diagnose) (appr. 9%)


a) Which different methods of addressing are used in diagnostic communication ?



(KWP2000)

  • Functional addressing
  • Physical Addressing

ACS - Exam-Example


Assignment 4 (CAN) (appr. 14%)


e) Which error detection checks are carried on the CAN Bus?


     1) On Frames



      2) On Bit level



1) On Frames

  • CRC –  Cycle Redundancy Check: which helps to verify the data being sent.
  • Message Frame Check

2) On Bit Level

  • Monitoring (Transmitters compare the bit levels to be transmitted with the bit levels detected on the bus).
  • Bit Stuffing.
  • Acknowledgment bit, which verifies that a Frame was correctly received.

______________

Others doesn’t expect on the answer:

  • Stop of transmission (Error Flag) or Error Frame.
  • Automatic Repeat Request.
  • Switch off of output drivers after consecutive errors been transmitted by the same node.

ACS - Exam-Example

Assignment 6 (MOST) (appr. 16%)


c) Which error handling is realized in the synchronous Channel of the MOST bus system ?


Non error handling is used in this area, if the data is not transmitted correctly is lost, and there is no repetition.

___________________________________________

Further information: indirectly related with the answer.

Here is used TDMA, so the data will be transmitted at the same frame position in a specified time pattern.

ACS - Exam-Example

Assignment 5 (Flexray) (appr. 15%)


a) Describe the following term in relation to time synchronization.


1) Offset correction



2) Drift Correction




1) Offset correction

  • Fixed Time difference between two clocks, to be corrected in order to synchronize them.

2) Drift Correction

  • Rate of change of the time difference between two clocks, due to differences in the oscillators and environmental conditions.

ACS - Exam-Example

Assignment 6 (MOST) (appr. 16%)


a) Which topology is used in the MOST Bus System?


First of all it’s a logical ring.

Normally realized as a physical ring, other topologies required additional components.

It can be enhanced to a double ring, but it’s not normal in automotive.

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