A statement put out this week by Liberty Global, saying it has shifted 10m of its DOCSIS 3.0 Connect Box devices, is somewhat perplexing. It’s a bit like saying you have just painted the George Washington Bridge – which means only that it is time to begin back at the other end and paint it again. Most advanced cablecos are moving on from DOCSIS 3.0 to 3.1, so Liberty seems to be boasting about a defunct device – and yet it is actually prolonging the life of these routers with some clever WiFi. Liberty Global has about 15m broadband customers – more if you count its majority stake in Ziggo in the Netherlands – and this is tantamount to saying…