I've been out of the DSL game for too long. Back in the day when I was a DSL field tech for a local telco, I always preferred the Paradyne (apparently now known as Zhone) modems. But we had limited selection. And these were all ADSL2+, plus some much older DSL technologies. Apparently you might need to find out what VDSL2 profile is in use/available. From 2 of the VDSL Zhone's on Amazon: VDSL2 with profiles 8a/b/c/d, 12 a/b, 17a or ADSL2+ So you may need/want to log in to your current Zytel and see if it provides the sync rate and other DSL info.