If its just Docsis testing you need, then most newer onx620's can do Docsis 3.1. An onx620 can not do sweep or loopback testing. For loop back testing you will need an onx630 with the NTX option. This will come with Docsis 3.1 and fwd sweepless sweep only, not full fwd and ret sweep. For full sweep (fwd and ret) you will need an onx630 with the SWX option.
Hope that helps.
