TP-Link TD-8840 - Manual (Page 62)

TD-8840 ADSL2+ Modem Router User Guide
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need to install the dial software, such as Winpoet, Enternet.
3) This product has the PPP dial procedure inside
,
so you will not need to use the dial
software if your protocol is PPPoA or PPPoE. ADSL Modem will connect automatically.
4) You can check whether your ADSL Modem succeeds in connection or not with PING
command.