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Originally Posted by Zeph
I might be wrong, but physically, not a lot, somebody hits a button which TFTPs new config files to the modems in a certain area, they check to see if there are any problems, if not roll onto the next area.
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Firstly the uBR that's having the upgrade done is given a new profile with the new speeds on it.
DHCP servers are then changed to point to a new modem config file for 2Mbit customers, then modems are disconnected from the network. When they reconnect they either pick up the new file with its' corresponding uBR profile already ready as above and there ya go.
Slightly simplified but that'll do ya.