We are looking for a OC3 -> 3xDS3 MUX. (If it can grow up to
a OC12 ->
12xDS3 thats a plus)
Sonet side will be 1+1 protected

I have looked at the following equipment is there any other
sonet muxes that
i should look at?

Adtran Opti-3
Adtran OPTI-6100
Cisco ONS 15310, 15327
Fujitsu Flashwave 4010, 4100, 4300
Fujitsu FLM 150

The difference between Fuji and Cisco is the backplane
architecture. The former is redundant and is
a five nines solution. The latter is not and is a four
nines solution. You will find the cisco device cheaper
to buy and operate. The cisco is also less RU and less

If you haven't already lighted your own dark fiber
network, there's a lot to know at layer 1 to be sure
you get the redundancy you're looking for in layer 3.
Have you considered leasing circuits from a LEC or
buying a wavelength managed service?