fido2100 3-Port Industrial Ethernet DLR Switch with IEEE1588
Data Sheet
April 10, 2013
Figure 5 Ring Topology Media Redundancy
For IO applications, a COTS switch in the ring must support IEEE 802.3 tag based and IP DSCP based
QoS with at least two prioritized queues, preferably four prioritized queues. The highest priority queue
must be dedicated for ring protocol messages for predictable performance. For IEEE 1588 applications
such as CIP motion, COTS switches directly on ring must support IEEE 1588 end-to-end transparent
clock (or boundary clock) and IEEE 802.3 tag based and IP DSCP based QoS with four prioritized
queues. The highest priority queue may be shared between IEEE 1588 and ring protocol messages. If
not, COTS switches can be connected through three port tap device as shown in Figure 4.
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