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AWR1642BOOST: +DCA 1000 EVM ::::: Use of USB and Ethernet extension cables

Alper Fatih
Expert 1040 points
Part Number: AWR1642BOOST
Other Parts Discussed in Thread: DCA1000EVM

Hi,

I am using a AWR1642BOOST + DCA1000 EVM. I am collecting raw 2x complex ADC data through these two EVMs and I am using mmwave Studio 2.0.0.2 also.

There was some problem of getting LVDS data from DCA 1000 EVM on Ethernet cable on my old laptop. Therefore, I bought a 100/1000 Gigabit Ethernet adapter (with USB hub). Now I have a newer laptop but I prefer to use USB hub with Gigabit Ethernet adapter for less hassle in the experimental setup.

I have plugged-in the following in the USB hub + Gigabit Ethernet adapter (2 in 1)

- One TI-provided USB cable from AWR1642BOOST EVM

- One USB cable from DCA1000 EVM (dont remeber if it came  with a USB cable or not ?

- One TI-provided ethernet cable from DCA1000 EVM

There is one single USB cable (15cm) output going from the above USB + Ethernet hub, into my laptop and things are working fine.

I wish to extend the length of this above USB cable from USB hub to my laptop. My questions are :

1)  Considering that I am already using a USB hub (with built in gigabit ethernet adapter) with 15cm USB cable, how much maximum length of additional USB extension cable I can use without (severely) effecting signal integrity ?

2)  What is the trade off on LVDS transfer rate of DCA1000EVM (maximum is 600Mbps) , when using the ethernet cable in a USB hub instead of directly using it in the ehternet (Rj-45) adapter of laptop ?

3) Is there a speed and / or signal integrity trade off if the two USB cables (one from AWR1642BOOST and one from DCA1000) are used as:

---  2 USB cables used in single USB slot of laptop through a USB hub

---- 2 USB cables used in a USB hub with builtin additional gigabit ethernet adapter

Thanks and regards

  • 0
    TI__Mastermind 24955 points

    Alper,

    I would need to see a picture of your physical setup.

    A setup using a USB hub that includes a Gigabit Ethernet adapter has not be verified by TI, so there is no guarantee that this setup would even work.

    The setup for the DCA1000EVM is specified in the User's Guide and the DCA1000EVM Quick Start Guide.

    Quick Start Guide: http://www.ti.com/lit/pdf/spruik7

    User Guide: http://www.ti.com/lit/pdf/spruij4

    Regards,
    Kyle

  • 0 in reply to Kyle Cousino
    Expert 1040 points

    Hi Kyle,

    I am attaching the picture of the setup. Please have a look at it and then please read my questions again. I hope you will understand my query better. 

    This setup is working fine as far as I think and as far as I am experiencing.

    Then, please advise about question 1, 2 and 3 of my above post.

    Thanks and regards.

  • 0 in reply to Alper Fatih
    TI__Mastermind 24955 points

    Alper,

    The underlying issue is that you are attempting to use a setup that TI has not verified so we cannot comment at this time on the various trade offs you are asking about.

    The recommend setup for using the DCA1000EVM is as follows:

    - 2 USB cables (each plugged into a different USB port on the PC)

    - 1 Ethernet cable (plugged into the RJ-45 connector on the PC)

    I have used 15 foot USB cables in the past without issue. I have also used a similar length Ethernet cable without issue.

    Regards,

    Kyle