Panasonic KX-HGW600 Operating Instructions Manual page 116

Operating Instructions
Keep Alive Option
The KX-HGW600 has a Keep Alive Option function. When the server of your ISP
disconnects for some reason, this function keeps your PPPoE Connection alive
automatically. The main features are as follows.
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This function is only available when you check Always on the PPPoE
Connection window.
It tries to recover the connection by sending a few data packets in this
sequence:
1) After 1 minute, 3 minutes, 6 minutes.
2) Thereafter, once every ten minutes.