The 550mhz networks are being changed VM are spending huge amounts of money on the network side .It is a big job amplifiers passives tap plates need changing .Qam 256 on the tv side is also being rolled out so is a bigger upstream (thank god )
.The problem is VM is made up from different cable companies all had there own way of doing things The network here can go up to 850mhz but we only use up to 747 mhz .