Reasoning most likely that it aligns with G.fast services and the move towards honesty/fairness i.e. by understating speeds they can be sure most people will get much more and be happy.
The speed customers will see on a speedtest site is just the TCP payload not counting PPPoE/IP/TCP headers, around 152-154Mbps for a total data rate of 160Mbps.
By giving a headline speed of 150Mbps, they avoid the problem of customers phoning up to complain "I paid for 160Mbps and I'm only getting 152Mbps" and the corresponding support costs.



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