Sound high frequency on the modem DPC3925

Hi, I got a modem DPC 3925 and I saw that the modem emits a sound as a mosquito after three or four hours turn on. I turned off the equipment from energy oftentimes, but the sound restart after three or four hours turn on. I don't know if this is a normal behavior, I don't believe. Can anyone help me? Thanks!
Fernando.

Is your dect phone place close to the cable modem, someone did mention that the dect n the wireless are causing some interferences.
If not then go to SH to exchange if still under warranty.
There are not much choice for devices on cable, only cisco DPC3925 n motorola SB6120 support DOCSIS 3.0. SB6120 is just a cable modem and nothing else.
Don't think u can just purchase a cable modem outside and use cos SH have mac address control, u can only use devices from SH as other devices u could not submit the mac address for processing.

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I'm not sure if this is the right place to make this question but let's try..
I try to measure the frequency response of the output impedance from a certain switched-mode converter using NI PCI-6115 (I inject sinusoids into output voltage and measure the output current). I get a nice plot but there are some problems in high frequencies. It seems that the measurement card makes some unexpected peaks. I use the network analyzer (Venable) to verify the results and beyond 200 kHz the results do not match. I attached the plot with the results from both methods (MC = PCI-6115, Venable = network analyzer). Does anyone have any idea what could cause this difference in high frequencies? The measurement set ups where exactly identical.
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Attachments:
Doc1.pdf ‏87 KB

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Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
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I am going to call the Apple Care tomorrow. Will keep you guys posted.
Message was edited by: chienlim

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