Just swapped my modem to DOCSIS 3.0. (Cisco DPC3010).
As I read on other people's post, Downstream is now strictly limited to 20Mbps. But, upstream got much faster.
I had a little trouble registering new modem. After registering/provisioning new modem with service rep, I plugged new modem, but it was not connecting and DS light was just blinking forever. I tried power cycling it several times and rep and I gave up and decided modem is defect.
Connected my old modem back, but wanted to try new modem again.
DS light was blinking for long time then, it moved onto US light and it was blinking for long time.
Checked modem status at 192.168.100.1 and learned firmware has been changed to COX firmware.
So, it probably was downloading new firmware from COX when it was blinking DS.
Called back and registered, now everything is in good working order.BEFORE