af91c418_r_Broadband_Speed___The_Basics__an_affect_your_broadband_speed
[Cause] Wrongly setup microfilters
If you've not connected these up properly you'll not get the best broadband experience. It's a common cause of intermittent connection and speed problems. You should avoid using long phone extension cables too. See Microfilters - how and why for more help.
Your Broadband Speed - The Basics
How this can affect your broadband speed