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06/21/2018
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4.1 Network topology
4.1.1 Hubs
To fit EPL jitter requirements it is recommended to use hubs to build an EPL network.
Class 2 Repeaters must be used in this case. In contrast to switches, hubs have the
advantage of reduced path delay value
(≤ 460 ns) and have small frame jitter of ≤ 70 ns.
The measuring system has integrated an Ethernet Hub, thus a line wiring is possible
in a simple manner.
Figure 8: Star- and line-topology in one EPL network
4.1.2 Jitter
Every
hub level introduces an additional Jitter of ≤ 70 ns. Only the number of hub
levels between MN and most distanced CN is relevant. If the MN is located in the
centre of line or a star topology, the number of hub level between the most distanced
CN is irrelevant for synchronization jitter.
