IMHO as every convention, this one is limited. You cannot put any number of CPCs or LPARs in it. And you don't need it. From the other hand any fixed-lingth field means some lost, overhead, i.e.  One hex for CPC? That's to much for two CPCs in a shop and can be completely omitted for single CPC. The same for LPARs - do you really need more than 16 in CTC? Much more? How many bits?

Of course it's also possible to define CTC with no reasonable convention at all. The only things which are really checked are CUADD number and UA for device. However all the devices can be numbered consecutively, as well as CU numbers. It would be nightmare to manage ...or not when using special table (and no changes). The advantage is absolutely no lost numbers.

BTW: I always use 3-digit device numbers and CU numbers for CTC. YMMV.

--
Radoslaw Skorupka
Lodz, Poland




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