ADC Kentrox CopperSMART 396 is another long-discontinued piece of unobtainium SDSL CPE which at first appears to be an SDSL DSU similar to Larscom CupreDSU. However, it was actually a smart DSU that is not totally bit-transparent. It was specifically for the Frame Relay encapsulation and implemented advanced monitoring functions.

The CopperSMART was smart to the point of having an Ethernet port with an IP address assigned to it! But it was still a DSU rather than a router, as the Ethernet port stayed out of the main data path and was only for O&M.

A product with this functionality caters to a rather special market and does not particularly appeal to me. I would also bet that ADC Kentrox had originally invented something similar for traditional [F]T1 applications, and that it is not an SDSL-ism. It certainly does not fill the need for a plain vanilla DSU for SDSL — that role is left to the XSB-2000 and our OSDCU.