Same issue here linking to a Cisco C9300 switch with 100G uplink. The only possible way to connect was to change the FEC mode from 'auto' to 'fec91'. Changing the connection speed from auto to a manual setting made no difference. Tested using both a Mikrotik brand 100G DAC cable and an fs.com brande...

For clarity - in case it helps anyone else - on the Openreach GEA network there are two methods that TalkTalk use depending if you are residential or business customer. 1. TalkTalk (residential) use straight DHCP/IPoE 2. TalkTalk Business use PPPoE As said above, for FTTP services their online help ...

The TalkTalk help pages do not appear to have caught up with their available broadband products, having only recently started selling FTTP services via Openreach connections - PTM encoding and VLAN 101 are only applicable to FTTC / VDSL2 connections. Whilst PPPoE is often used to provide the custom...