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Selecting the Network Devices Section 2-3
L3 Switching Hub with
Multicast Filtering and L4
QoS Functions
We recommend this kind of switching hub when both tag data links and mes-
sage communications are executed.
By setting tag data links for higher-priority transmission, it is possible to pre-
vent problems such as transmission delays due to message communications
traffic and packet losses due to buffer overflow. Settings must be made in the
switching hub to enable this function and give higher priority to tag data link
packets.
Special settings must be made in the switching hub when using the multicast
filtering function and L4 QoS function. There must be enough multicast filters
for the network being used.
Note (1) Ask the switching hub manufacturer for setting procedures for the switch-
ing hub.
(2) Install the switching hub so that its environmental resistance capabilities
are not exceeded. Ask the switching hub manufacturer for information on
the environmental resistance of the switch hub.