Synchronous virtual pipe

Synchronous virtual pipe

When realizing pipeline forwarding a predefined schedule for forwarding a pre-allocated amount of bytes during one or more time frames along a path of subsequent switches establishes a "synchronous virtual pipe" (SVP). The SVP capacity is determined by the total number of bits allocated in every time cycle for the SVP. For example, for a 10 ms time cycle, if 20000 bits are allocated during each of 2 time frames, the SVP capacity is 4 Mb/s.

Pipeline forwarding guarantees that reserved traffic, i.e., traveling on an SVP, experiences:

# bounded end-to-end delay,
# delay jitter lower than two TFs, and
# no congestion and resulting losses.

Two implementations of the pipeline forwarding were proposed: Time-Driven Switching (TDS) and Time-Driven Priority (TDP) and can be used to create an SVP sidelay in the Synchronous Future Internet.


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