A 140CRP31200 and 140 CRP 93• 00 remote I/O head modules can be installed on the same local rack.
NOTE: S908 remote I/O drops are not part of a Quantum EIO network.
A Mixed Ethernet and S908 RIO Network
This figure shows an example of a basic mixed Hot Standby system:
These two independent Hot Standby networks (Ethernet and S908 RIO) use the same primary and standby CPUs. A detected errors in each Hot Standby network is treated independently by its own CRP/CRA.
If the primary CPU has to go OFFLINE, both systems switchover, that is, the standby CPU becomes the primary CPU for both Hot Standby networks.
If the standby CPU goes OFFLINE, both systems do not switchover. In either case, the systems are no longer redundant.
NOTE: Only the 140 CPU 672 6• support a mixed RIO Hot Standby network.
The Quantum EIO Hot Standby network uses a 140 NOC 781 00 control module to connect to a higher level network.
The S908 Hot Standby network uses a 140 NOE 771 01 control module to connect to a higher level network.
