Wait till the end of the day after it is connected, as long as it is connected for over 15 minutes on the first day. Then (within reason) do what you like. The 10 days is a BT Wholesale myth and not mentioned anywhere by Openreach, who control the connection and provide the DLM.
Dynamic Line Management (DLM) is employed in GEA-FTTC. DLM constantly manages lines to maintain a target link quality (speed and stability). It does this for as long as the product exists.
At provision, the line is put on “wide open” VDSL2 line profiles allowing the upstream and downstream line speeds to run at the upper limit of the product option selected.
On the first day of operation, DLM will intervene if severe instability is detected. Otherwise, DLM will wait until the day after provision before deciding if it must intervene, provided that the line has been trained up for at least 15 minutes during the preceding day.
From Openreach SIN 498.
Bear in mind you may need to use the Openreach modem in the future, either for diagnostics or if your modem/router fails. So don't bin it or sell it.
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
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