DACS Equipment

[sjk <sjk () dredel com>]

I have a number of mux DS-3s coming in - right now they drop straight 
into aggregation routers. What I like to do is drop them into a local DACS 
and comb them out to DS-1s and then re-mux them back on to internal DS-3s. 
This will let me move circuits around digitally inside our equipment.

Does anyone know what vendors I should speak to about such an application? 
Or maybe know of a cost-effective solution?

TIA -- Steve