CenturyLink & Third Party Modems (TRENDnet AC750, TEW-816DRM)

For those fighting the battle of CenturyLink and Third Party DSL modems, this configuration is currently working for my DSL line.

• CenturyLink 40Mbps, VDSL2, PPPoE
• TRENDnet AC750 Wireless VDSL2/ADSL2+ Modem Router, 200 Mbps VDSL Downstream Speeds, USB share ports, TEW-816DRM

Configuration:

• DSL Mode: PTM
• Protocol:  PPP over Ethernet (PPPoE)
• WAN Service Type:  Internet
• 802.1Q VLAN ID:  201 
• Priority: 0
• IP Protocol:  IPv4
• PPP Username: "set this to what CenturyLink Provides" mine also had the @qwest.net but I've been a long time customer.  Could have "centurylink.net" etc.
• PPP Password:  "again this is provided by Centurylink"
• Confirm Password:  
• Authentication Method:  Auto
• Dial-Up Mode: Always On
• Inactivity Timeout: 1
• MRU Size:  1492
• MTU Size:  1492  (I've read that others have changed this but I have not)
• Keep Alive:  "checked"
• LCP Echo Interval (sec): 30
• LCP Echo Failure: 5

Note:  The items that bit me were the DSL mode ( CenturyLink tech told me ATM), and the VLAN setting.  Hope this helps someone else as I spent a considerable amount of time on trial and error.  

Also, this model of modem is very finicky.  It appears to be highly configurable, but what caused my initial issue was that a simple reboot caused it to lose all configuration.  During my efforts to reconfigure it, it lost all configuration multiple times, proving that it apparently does have some memory issue.