On Wed, 3 Jun 2020 13:01:50 +0000, Allan Staller <allan.stal...@hcl.com> wrote:

>4 ficon ports(CHPIDs)  and 2 ficon cables are required. Each cable is shared 
>in a bi-directional manner.
>
>e.g CTCchipd1  <---->  chpid2 CNC   Signalling Path 1
>      CNCchpid3  <----> chpid4  CTC     Signalling Path 2
>

With FICON channels its a little simpler than that,  both sides are channel 
type FC,  and cu type FCTC,   No need to distinguish CTC/CNC anymore, yay!

Dana

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