Well, I've never worked with channelized POS interfaces, but I'm guessing it's the same idea as with the old framed E1/T1 controllers, of which you could use only part of the capacity (any number of time-slots); and, just as you had, for example, "interface serial 0/0:1" to designate such "sub-capacity", you would have "interface pos 1/0:1" here.
Basically this type of POS would allow for "intermediary" capacities between STM1 (~155Mbps) and STM4 (~622Mbps) (and up to STM1, of course) - I guess this is not your case, so your choice would be the unchannelized SPA (SPA-1XOC12-POS).
_But_, digging a little further I found that SPA-1XOC12-POS is end-of-sale, its recommended replacement being SPA-2XOC12-POS (which is not mentioned in the link I posted earlier):
So, as I see it, if you need very long-term support for your SPA you'd have to go for SPA-2XOC12-POS and at least IOS 15.2(4)S; otherwise SPA-1XOC12-POS (supported since IOS 12.2(18)SXE) should be fine.
There's only one kind of SIP-400, I'm not sure what would happen if you try to run a piece of hardware under unsupported IOS, and I can find no evidence of the SIPs not being supported in the 7603 (non-S) chassis.
Also, I'd go for IOS 15.2(4)S4, but that's just a personal thought - opinions of more experienced people are welcome just about now ...
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