SDH mux question

Folks,

I am wondering if anyone of you folks know a box that could
take the 4 STM-16 from a STM-64, but with a 4 fiber handoff
to a random carrier. Who knows of such a box by any chance?
I was looking for the DWDM- type of things (MRV, Transmode)
any maybe those do exist.

Thanks folks!

-ako

Cisco 15454 can do this easily, IIRC.

Simon