The full form of VPI is Virtual Path Identifier. An asynchronous transfer mode (ATM) cell packet’s network path to its target node is uniquely defined by the VPI, a data transmission identification. It is a method for sending data in discrete chunks.
How VPI formed
Each ATM cell packet contains VPIs, which are 8 to 16-bit numeric headers.
In this context, the term “transmission path” refers to the optical fiber that carries high-speed data. Hierarchical routing is made possible by dividing the virtual connection identification into two parts, the virtual path identifier (VPI) and the virtual circuit identifier (VCI). In a normal ATM network, the majority of switches are routed using VPIs.
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Functioning of VPI
When connecting two endpoints of a transmission path or fibre, a virtual path and a virtual circuit are utilised. There could be a lot of virtual paths on the actual fibre. A link that joins two switches is referred to as a virtual path. Cell networks are supported by virtual circuits. The virtual circuits used by cells in a single message are the same. Media bandwidth is utilised via a variety of virtual routes. Each VP has a bandwidth of B/N if the media bandwidth is B and there are N VPs in use. Virtual channels are further separated into each virtual path. The VP is determined by VPI for each unique user and their consumption.
What is a Virtual Path
The ATM header effectively divides the communication route’s bandwidth into a number of virtual channels utilising their VPIs. An assigned amount of bandwidth is allocated to each VP.
- The quality of data connections and bandwidth options have significantly improved with the introduction of optical fibres and virtual path identities.
- These are defined by usage and parameter specifications, which standardise the process.
- For unbroken communication, switching and semi-permanent virtual connections are provided.
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- It is used to link end users.
- It manages data and signals from end-user to end-user.
- It also detects use between end-users and network entities.
- It minimises network design complexity, resulting in a simpler network.
- The network’s consistency and performance have both increased.
- It reduces setup times and the processing of minor connections.
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