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VPI/VCI
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Figure: VPI/VCI
- A VPI identifies a unidirectional transport of ATM cells belonging to a bundle of virtual channels
- A VCI describes a unidirectional transport of ATM cells
- 8 bits for VPI and 16 bits for VCI (at the UNI) are used for routing purposes
- Assignment of VPI/VCI is done by:
- The network
- The user
- Negotiation between the user and network (signalling)
- Standardization (Preassigned VCI/VPI values e.g., unassigned cell, etc.)
本文来自ChinaUnix博客,如果查看原文请点:http://blog.chinaunix.net/u1/56177/showart_1797481.html |
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