Saitel RTUs - Hot-standby using WiFi communication between two Saitel CPUs?

[sesa426102_brid]

Is it possible to have 2 Saitel RTUs as a Hot standby arrangement connected on a wireless network? If Yes, what part number should we refer to?

[sesa426102_brid]

And, because wifi has bandwidth issue or latency issue, is it still possible to use 2 Saitel RTUs on a Hot standby arrangement. This is for a project specifying the hot standby arrangement as a mandatory requirement.

[Iván_González]

Hello there. Saitel CPUs do not have embedded wifi ports - only copper or fiber ehternet links are supported.

In any case, the HOT-STANDBY functionality of Saitel CPUs is designeed to maximise uptime of the redundant system by having the 2 CPUs share the same databse and configuration. Only the  HOT CPU will be actively communicating and acquiring data, with the STANDBY one receiving updated information from the HOT one.

In that type of setup, each port (serial or ethernet) can be connected to wireless modems and redundant communication links configured to make use of these.

[michael_mckay_p]

Thanks Ivan,

Do the 2 CPUs have to be in the same rack? Is that correct? If so, can the CPU synchronization happen effectively over an Ethernet network with a wifi segment?

[Iván_González · Accepted solution]

Morning Michael,

Redundant Saitel DP CPUs can be installed in the same rack or different racks. When installed in the same rack, they can share serial expansion modules and manage redundancy data using dedicated backplane lines.

Regarding the redundancy mechanism there are two different aspects:

• CPU coordination makes us of two physical channels. These can be backplane lines, serial or ethernet ports.
• CPU data synchronization can make use of dedicated backplane or an ethernet port. WiFi links should be alright for this.