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Road vehicles. Open interface for embedded automotive applications -- OSEK/VDX Network Management (NM)
1.1 Embedding of the Network Management (NM)
NM defines a set of services for node monitoring. Figure 1 shows how the NM is embedded into a system and that the NM shall be adapted to specific requirements of the bus system used or to the resources of the nodes.
NM consists of the following:
interface to interact with the Application Programming Interface(API);
algorithm for node monitoring;
internal interfaces (NMÂ <->Â COM, etc.);
algorithm for transition into sleep mode; and
NM protocol data unit (NMPDU).
1.2 Adaptation to bus protocol specific requirements
Adaptation to bus protocol specific requirements consists of the following:
CAN, VAN, J1850, K-BUS, D2B, etc.;
error handling, e.g. bus-off handling in a CAN, transmission line error handling; and
interpretation of the status information, e.g. overrun or error active/passive in a CAN.
1.3 Adaptation to node resources
Adaptation to node resources consists of the following:
scaling of the NM as a requirement of the node; and
application-specific usage of the NM services.
1.4 Adaptation to hardware-specific requirements
This consists of adaptation to a protocol circuit and a physical layer circuit, e.g. switching the bus hardware to one of the possible physically power save modes.
1.5 Station management (system-specific algorithms)
There are a variety of additional tasks involved in coordinating a network. These are not described in ISOÂ 17356, since they are system-dependent. Hence, these tasks are done by the application, e.g. by a module called station management.
1.6 Philosophy of node monitoring
Node monitoring is used to inform the application about the nodes on the network. Thus, the application can check with the appropriate service if all stations required for operation are present on the network.
Figure 1 Responsibility of interface and algorithms
Key
| 1 | API |
| 2 | several buses connected to one ÎĽController |
| 3 | interface to DLL, COM-specific, protocol-specific |
| 4 | interface to COM Interaction Layer |
| 5 | station management (outside the scope of ISOÂ 17356) |
| 6 | algorithms |
| 7 | protocol-specific management algorithms |
| SDO | BSI: British Standards Institution |
| Document Number | ISO 17356-5 |
| Publication Date | Feb. 13, 2006 |
| Language | en - English |
| Page Count | |
| Revision Level | |
| Supercedes | |
| Committee | AUE/16 |
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