Usage of TK850 in Redundant Controller Config without BC810?
Hi I wanted to ask if it is necessary to use the cable TK850 for redundant controller pair which are not using BC810?
I am using a redundant pair PM861 and shall not be using the BC810s; please confirm that I will be needing the TK850 cable or not?
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It depends on how you are using PM means if you are not using any CEX modules and you are using only module bus then TK850 cable is more than enough not required to use BC810.
If you are using any CEX modules like CI854 /CI853/CI867 and you are looking for more availability means redundancy and cross comunication of CEX modules with PM. then prefer to go for the BC810 with TK851 cable & terminate the CEX buses with TB850 connectors.
In General BC810 divides the CEx bus into two separate segments so either of the controller fails CEx bus modules gets power from the BC810 separately so the system is more available & you can replace faulty controller in online along with baseplate without diturbing the process.
Hope it clarifies your doubt
Now you decide your requirement & use the BC810 accordingly.
Yes, you need TK850 cable for interconnecting redundant CPUs. If there are interface modules connected to CEX bus them TK850 shall be connected between farthest away modules from processor else this shall be connected directly between both processors.
You can refer 3BSE036351-510 A, Controller hardware manual Page-90. Below is the statement from manual.
Installing the PM86x/TP830 Processor Unit in Redundant Configuration
Source: 3BSE036351-510 A, Controller hardware manual