We have and ONS 15454 using OC-3 with the STS-1 (OC1) frames broken out individually. We're planning to migrate this to a
SPA-2XOC3-POS which supports OC-3c (concatenanted) interface. Will this work for the existing OC3 circuit? If the framing bits are passed unchanged by the carrier I would say this should be not problem, but not sure if this would be supported by Cisco. Changing OC-3 to OC-3c is a big headache (AT&T ;-)).