ATM Operation and Maintenance

ATM Operation and Maintenance is a set of protocols defining how Asynchronous Transfer Mode interfaces can test their reliability. Not unlike many other OA&M protocols, ATM OAM relies on a predefined packet format for its monitoring functions.

## Contents

* 1 Packet format
* 2 Types and function types
* 3 References
* 4 External links

## Packet format

F4 (VP) OAM Cell Format

GFC  | VPI  | VCI  | PT  | CLP  | HEC  | OAM TYPE  | Function TYPE  | Function Specific Fields  | Reserved  | CRC-16

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| Same as User Cell  | 3 (Segment)

4 (End-to-End)

|  |  |  | 4-bits  | 4-bits  | 45-octets  | 6-bits  | 10-bits

F5 (VC) OAM Cell Format

GFC  | VPI  | VCI  | PT  | CLP  | HEC  | OAM TYPE  | Function TYPE  | Function Specific Fields  | Reserved  | CRC-16

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| Same as User Cell  | Same as User Cell  | 100 (Segment)

101 (End-to-End)

|  |  | 4-bits  | 4-bits  | 45-octets  | 6-bits  | 10-bits

Charts from [1]

## Types and function types

The following table identifies the type and function type field for the major OAM operations of Fault Management, Performance Management, Activation/Deactivation, and System Management.

OAM Type  |  | Function Types  |

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Fault Management  | 0001  | AIS  | 0000
| 0001  | RDI/FERF  | 0001
| 0001  | Continuity Check  | 0100
| 0001  | Loopback  | 1000
Performance Management  | 0010  | Forward Monitoring  | 0000
| 0010  | Backward Reporting  | 0001
Activation/Deactivation  | 1000  | Performance Monitoring  | 0000
| 1000  | Continuity Check  | 0001
System Management  | 1111  | Non-Standardized  |

## References

1. ↑ D. McDysan and D. Spohn, "ATM Theory and Applications", 1999

## External links

* ITU-T I.610

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