I've owned a TP-Link TD-W8960N DSL modem for 3 months. When I purchased this modem, I subscribed to CenturyLink 5Mb/sec ADSL service, here in Fort Lupton, CO. During the initial modem configuration, CenturyLink DSL support recommended that I use these settings:
VPI: 0
VCI: 32
WAN Link Type: PPPoA (PPP over ATM)
After I configured these settings, the modem ran flawlessly at 5Mb/sec downstream and 896Kb/sec upstream for 2 months! Since this modem was working well, a month ago I upgraded to CenturyLink's 7Mb/sec ADSL service. However, I've been experiencing fluctuating downstream speeds and I had the full 7168Kb/sec downstream speed for only 1 day!
I called CenturyLink DSL support a second time, but I was told that I'm using an unsupported modem and that it's necessary for me to demonstrate that the problem occurs with a modem that CenturyLink supports! So I bought a CenturyLink-branded Actiontec C1000A and it is slower than the TP-Link modem! This was enough to convince CenturyLink to send a technician to my house. She measured the speed at the telephone network interface box, outside of my house, and reported that it's 7Mb/sec. I believe that this is correct because I've seen the TP-Link modem connect at this speed!
Next, I created a support ticket with TP-Link tech support. They asked me to take a screen shot of the xDSL statistics modem web page and to take some measurements with their BRCM DSL diagnostics tool. TP-Link's verdict is that a device in my network is interfering with the modem. However, the only other devices on the phone line are my cordless telephone system base station and my satellite TV receiver, both of which are DSL-filtered! I've tried disconnecting the satellite TV receiver from the phone line, but this doesn't help. Note that it was connected to the phone line during the day that I had the 7168Kb/sec downstream speed.
I believe that a firmware configuration change is needed to get my TD-W8960N to work reliably with this faster DSL connection. Can anybody help me? Here are some statistics from the xDSL web screen (Second Column: Downstream; Third Column: Upstream)
SNR Margin (0.1 dB): 106 140
Attenuation (0.1 dB): 385 240
Output Power (0.1 dBm): 201 123
Attainable Rate (Kbps): 7520 1216
Thanks!
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