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TP-LINK TD-W8901G  
Wireless Modem Router 
Advanced Troubleshooting Guide 
 
Released on 2009.09.25  
Version 1.0 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                               
                    
                    Inhaltszusammenfassung zur Seite Nr. 2 
                    
                          Content  Summary ................................................................................................................................................................... 3  Troubleshooting Flow Chart and Resolutions .......................................................................................................... 3  Check 1 .........................................................................................................................................................
                    
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                          Summary  This document attempts to provide the basic procedures for troubleshooting TD-W8901G modem  router problem.   Troubleshooting Flow Chart and Resolutions    Click the quick links for more details:     Check1   Check2   Check3   Note1   Note2     Resolution1    Resolution2    Resolution3    Resolution4    Resolution5    Check 1  1. Make sure that the original power adapter is correctly connected from the modem to the wall socket  and it is not damaged;  2. Make sure that the telephone l
                    
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                          Check 2  The indicator lights on the front panel of the modem router are used to verify the unit’s operation and  status between your modem, PC and ISP’s network.      The table below describes what the lights mean.  Label State Description Resolution  On  (Steady Power On Check ADSL light.  Green)  Power  Off No Power Resolution 3  On (Solid  Synchronized Check Internet light  Green)  Flashing Wait 2 minutes, if the light does not turn a  Attempting Synchronization  ADSL  Green solid green, r
                    
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                            Note 1  Open a web browser (either of Windows Internet Explorer, Mozilla Firefox, Apple Safari, Google  Chrome, Opera or any other web browser), key in 192.168.1.1 in the address bar and press enter. The  default username and password are both “admin” (all in lower case).   Refer to the following link for more details: http://www.tp-link.com/support/showfaq.asp?id=87  Note 2  1 、 Go to Quick Start, select the correct connection type (PPPoE/PPPoA or the others), and then  enter your local VPI
                    
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                          Resolution 1  Some software or games requires the special ports to be opened on the modem router, for example:  Web Server (TCP Port 80), FTP Server (TCP Port 21), Xbox Live (UDP Port 88\3074, TCP Port 3074),  etc. Refer to the following link for the configuration: http://www.tp-link.com/support/showfaq.asp?id=205  Resolution 2  1. If the customer’s problem is not mentioned by this troubleshooting guide, please send an Email to  support@tp-link.com for further assistance.  2. Call local techni
                    
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                          Resolution 5  1 、 Go to the Status page, click System Log, and check the log whether reports “PAP: login to  remote failed; please check user/pswd” which means the PPP username and password are  incorrect. If so, please go through the Quick Start again and enter the correct PPP  username/password and VPI/VCI values.    2 、 Check the Access Management – Filter page, check the active IP/MAC filter rules, you can  remove all the rules or change them to “Active – No” for troubleshooting purpose.  
                    
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                          3 、 Check the Access Management – Filter page, check the active URL filter rules, you can remove  all the rules or change them to “Active – No” for troubleshooting purpose.      4 、 Go to the Interface Setup – Wireless page, make sure that Access Point is Activated, SSID is  broadcasted, Authentication is correct or deactivated, Wireless MAC Address Filter is  Deactivated            8 / 15                                                                                                          
                    
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                          Appendix - FAQ  Q1. How do I restore my modem’s configuration to its factory default settings?  With the Router powered on,  press and hold the Reset button  on the rear panel for 8 to 10  seconds before releasing it.      Press it for 8 to 10 seconds        Once the Router is reset, the current configuration settings will be lost and you will need to  Note  re-configure the router.     Q2. What can I do if I don’t know or forgot my password?  1) Restore the Router’s configuration to its facto
                    
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                          Q4. What can I do if I cannot access the web-based configuration page?  1) Configure your computer’s IP Address (TCP/IP settings);  For Windows XP OS  Go to Start > Control Panel, you  will then see the following page.  Click Network and  Internet Connections            Click Network Connections              Right-click Local  Area Connection  Click Properties        10 / 15                                                                                                                         
                    
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                          Double-click Internet  Protocol (TCP/IP)          Select Obtain an IP address  automatically  Select Obtain DNS server  address automatically  Click OK      2)   11 / 15                                                                                                                                                                                                                                                                                                                                         
                    
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                          Click OK      For Windows Vista OS  Go to Start > Settings > Control Panel  Click View network  status and tasks      Click View status    12 / 15                                                                                                                                                                                                                                                                                                                                                                
                    
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                            Click Properties      Double-click Internet  Protocol Version 4  (TCP/IPv4).      13 / 15                                                                                                                                                                                                                                                                                                                                                                                                                       
                    
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                          Select Obtain an IP address  automatically  Select Obtain DNS server  address automatically  Click OK          3) Configure your IE browser    Open your Internet Explorer web    browser, click Tools tab and you will    see the following screen.                  Click Internet Options      14 / 15                                                                                                                                                                                                         
                    
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                          Select Never dial a  connection  Click OK        Now, try to log on to the Web-based configuration page again after the above settings have been  configured. If you still cannot access the configuration page, please restore your modem router’s  factory default settings and reconfigure the device again.  Q5. How to get the technical support from TP-LINK?   To download the latest Firmware, Driver, Utility and User Guide, please go to  www.tp-link.com/support/download.asp   For basic configurat