This will fit a microfiter or a Bt Filtered face plate and connects to the dsl port on your modem or router etc
RJ12 to RJ12 (RJ12 fit RJ11 sockets) made with Cat6a twisted pair cable.
Filtered Version 'said to help remove interferance'
(filtered end connects to your hub or modem or router)
Note
about filters, I only sell filtered cables because people request them
my advice would be to buy any one of my other cat 6 modem cables without
a filter.