Network Interfaces
ATM standards define three protocols used across the interfaces connecting the components of an ATM campus network:
UNI | Defines | the | interface | between an ATM User Device (such as a terminal, | |||||||||||
| router, bridge, server, workstation, or concentrator equipped with an ATM | ||||||||||||||
| adapter) | and the ATM network. The | ATM | subsystem supports | the private | ||||||||||
| UNI | defined | by | the | ATM Forum UNI Specification V3.1. |
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SSI | Defines | the | interface | between | two | ATM | switches | in | the | same | ATM Cluster. | ||||
| The SSI fully supports networking functions without the need of operator | ||||||||||||||
| intervention, such as routing, node failure and node recovery, | backup, and | |||||||||||||
| topology | management by the Topology Routing Service (TRS) program. | |||||||||||||
| You | can | define | multiple | SSI | connections | between | two | ATM | switches. The | |||||
| SSI has been developed from the | ||||||||||||||
| subnetworks. |
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NNI | Defines | the | interface | between two ATM switches belonging to different ATM | |||||||||||
| Clusters in the same subnetwork or in different subnetworks. |
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| Operator | intervention | is | required in order to manage networking functions | |||||||||||
| such | as | routing, backup, topology changes, and so on. |
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| You | can | define | only | one NNI | connection | between | two | ATM | switches. | |||||
