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Broadcom DSL Diagnostics Tools

If you are not comfortable using the commandline to tweak your router's settings, then, this very nice find at: can help you, once you launch it via the commandline :)

This is applicable to PTCL/Tenda W150D/Micronet SP3367NL Router!


(Please read the entire post carefully before attempting any changes)

To run it as described in the first link:
To use it:
1. Open the CMD prompt and "cd" to the extracted folder containing the Broadcom app.
 2. If you are using a NETGEAR router, visit this address in your web browser, otherwise, disregard this step.
3. Type "bcmdsldiagsl -s ROUTERIP

Startup Screen ... note the scrolling stats ... browsing may not be possible while program is running

To view more screenshots, please continue reading

View menu ... very useful graphs available

Bit Loading ... a one without gaps and proper shape (inverted U for the typical power scheme used) indicates a quieter line ... gaps indicate noise/interference at that tone/frequency range ... see here for more info!
SNR Margin(s) ... stability is more important here although some variation is normal ... if margins drop enough, the modem may lose sync ... in this graph margins may seem higher due to sync speed 'cap' used by the ISP (PTCL) ... other ISPs may go for a target snr margin
Test menu ... allows enabling/disabling chipset capabilities to tweak the connection
Apart from the modulation schemes, we can also set the Target Training Margin (in hexadecimal) for the modem ... see here for the Target SNR Table!
Chipset Capabilities ... see here for some common tweaks!
Counters ... Line Statistics ... see here for explanation of most common ones!
Some more stats!

Only some of the options have been shown here ... these are the ones you can get info about ... for the rest, you are on your own!

Warning & Disclaimer: You may brick your router or cause it to malfunction or invalidate your warranty by using this utility shown here as its undocumented! You alone shall be responsible for your actions!


  1. Hi bro I want to watch ptcl smart tv channels on my galaxy note 1 via wifi but the problem is that they're very choppy.There's some sort of consensus over tge internet that it can be fixed by increasing the multicast rate in the router however my problem is that there'se no option of increasing multicast rate on tenda w150 d. I was wondering if you could be of any help in this regrad.
    waiting for your reply

  2. Hello!

    I'll look into the web interface, but, for now you may use the wlctl command via telnet (note that setting is reset on reboot):

    - the help for wlctl gives this
    mrate force a fixed multicast rate:
    valid values for 802.11a are (6, 9, 12, 18, 24, 36, 48, 54)
    valid values for 802.11b are (1, 2, 5.5, 11)
    valid values for 802.11g are (1, 2, 5.5, 6, 9, 11, 12, 18, 24, 36, 48, 54)
    -1 (default) means automatically determine the best rate

    - so the command could be:
    > wlctl mrate 54

    though you may try
    > wlctl -i wl0 mrate {value}
    > wlctl -i wl0 bg_mrate {value}

    as well! Currently I am using another router so I'll give this a try later!

  3. Dear Ahmed,

    I have tried to change firmwares on PTcl Tenda W150D routers and its was supremely successful. Now I am having difficulty changing firmware back to original on PTCL tenda W150D-U with EVO support. I am suspecting it to be locked.

    1. Hello!

      The W150D-U router is similar to Tenda's d303 router and at least one person has posted about using Tenda's firmware on it on this blog. Although I don't have a W150D-U to test at this time, most likely the firmware would work and at most would require removal of header from firmware file if needed!

      Hope this helps!


  4. As you may have learned that FCC has outlawed modifiable router and TP link has stated to lock down its new products. So its vital we can use old models with new capabilities.

    1. Hello!

      Yes it is true that FCC laid down some laws but (under pressure) they never accepted blocking 3rd party firmware(s). TP-Link however argues that it's simpler for them to lock down the router's firmware. Although, this should apply to US only it depends upon TP-Link to devote costs to different versions of routers for different regions.

      Anyhow, it's only a matter of time and effort to defeat any locks put in place!

      Better still, one can go for manufacturers that support open sourced firmware out of the box for their routers!



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