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CobraNet Primary & Secondary 35
ACU16-C & NHB32-C Owner’s Manual
ENGLISH
CobraNet Primary & Secondary
These two examples show how the CobraNet PRIMARY and SECONDARY ports can be
used to build redundancy into systems. In the first example, if a primary connection fails,
the system automatically switches to secondary and operation continues uninterrupted.
However, if the switching hub fails, the entire system stops working. In the second example,
individual switching hubs are used for primary and secondary, so even if switching hub A
fails, operation continues on secondary via switching hub B.
Ethernet switching hub
88
NETWORK HUB AND BRIDGE
LINKCONDUCT
LOCK
ERROR
88
NETWORK HUB AND BRIDGE
LINKCONDUCT
LOCK
ERROR
NHB32-C
Ex. 1
Ex. 2
NHB32-C
ACU16-C ACU16-C
Ethernet switching hub A
88
NETWORK HUB AND BRIDGE
LINKCONDUCT
LOCK
ERROR
88
NETWORK HUB AND BRIDGE
LINKCONDUCT
LOCK
ERROR
Ethernet switching hub B
NHB32-C NHB32-C
ACU16-C ACU16-C
Primary CobraNet
Secondary CobraNet