System Communication Architecture: Difference between revisions
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The '''System Communication Architecture''' (given as '''Systems Communication Architecture''' in some documents) is [[Digital Equipment Corporation|DEC]]'s [[data network]]ing [[architecture]] for [[VAXcluster]] systems; it defines the major constituent [[protocol]]s, what functions each one performs, and how they interact. It allows the basic data-communication mechanism of a VAXcluster, the [[Computer Interconnect]], to be shared between the numerous functions needed to operate the VAXcluster. | The '''System Communication Architecture''' (given as '''Systems Communication Architecture''' in some documents) is [[Digital Equipment Corporation|DEC]]'s [[data network]]ing [[architecture]] for [[VAXcluster]] systems; it defines the major constituent [[protocol]]s, what functions each one performs, and how they interact. It allows the basic data-communication mechanism of a VAXcluster, the [[Computer Interconnect]], to be shared between the numerous functions needed to operate the VAXcluster. | ||
The System Communication Architecture has | The System Communication Architecture has a three-tier model consisting of the layers (from top to bottom): | ||
* '''System Application''' (SYSAP), using the SYSAP Protocol | * '''System Application''' (SYSAP), using the SYSAP Protocol | ||
* '''System Communications Services''' (SCS), using the SCS Protocol | * '''System Communications Services''' (SCS), using the SCS Protocol | ||
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The SCA architecture supports the performance of six different functions: | The SCA architecture supports the performance of six different functions: | ||
* Cluster configuration management | * Cluster configuration management | ||
* Buffer management | * [[Buffer]] management | ||
* Connection management | * [[Connection]] management | ||
* Directory services | * [[Directory]] services | ||
* Datagram and sequenced- message services | * [[Datagram]] and sequenced-message services | ||
* Named-buffer transfer services | * Named-buffer transfer services | ||
Revision as of 12:59, 1 May 2024
The System Communication Architecture (given as Systems Communication Architecture in some documents) is DEC's data networking architecture for VAXcluster systems; it defines the major constituent protocols, what functions each one performs, and how they interact. It allows the basic data-communication mechanism of a VAXcluster, the Computer Interconnect, to be shared between the numerous functions needed to operate the VAXcluster.
The System Communication Architecture has a three-tier model consisting of the layers (from top to bottom):
- System Application (SYSAP), using the SYSAP Protocol
- System Communications Services (SCS), using the SCS Protocol
- Port/Port Driver Layer, using the PPD Protocol
SCA Services
The SCA architecture supports the performance of six different functions:
- Cluster configuration management
- Buffer management
- Connection management
- Directory services
- Datagram and sequenced-message services
- Named-buffer transfer services
See the article linked below for detailed descriptions of the SCA functions.
External links
- The System Communication Architecture, in DTJ, Vol. 1 No. 5, September, 1987 (pp. 24-30 of the PDF)
