TD-W8970N 
Wireless N ADSL2+ Modem Router User Guide
Figure
3.Change the VPI or VCI values which are used to define a unique path for your connection. If you have been given specific settings for this to configuration, type in the correct values assigned by your ISP. Here we select PPPoE WAN Link Type for example, enter the Username and Password given by your ISP, and then click Next.
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