Ideally, the pedantic protocol to follow would be --
- From the modem/router's administration interface (CLI or GUI), "down" the xDSL service.
- Disconnect the modem/router from the incoming line.
- Adjust the modem/router's configuration.
- Power down the modem/router.
- Reconnect it to the incoming line.
- Once 30 minutes have passed since performing step one, power up the modem/router and allow it to re-train.
The 30 minute wait is recommended due to the fact that the DLM considers those parameters, which it monitors, in 15 minute blocks. It is not known where any 15 minute block would begin and end. Thus by allowing 30 minutes to elapse, there is one complete 15 minute block in which the DLM will see no data and, hopefully, will take that as an indication of a planned outage and not circuit instability.