FarSync BERT

FarSync BERT - Calibration

The only calibration that your FarSync BERT requires is to verify the correct operating frequency of the internal crystal oscillator used for clock generation.

This can be performed without disassembling the unit by measuring the generated clock at the DCE interface.

It is recommended to test your BERT's calibration annually.

You will need:

To calibrate your FarSync BERT:

  1. Install the BERT drivers and software on the host system to which you will attach your BERT
  2. Plug in the USB BERT or install the PCIe BERT device
  3. Allow ten minutes with your system running for the BERT to stabilise at the current ambient temperature
  4. Use the BERT software to configure the BERT port. You will need to set the following settings:
  5. RATE: 1024000,
  6. MODE (M): SYNC,
  7. INTERFACE (I): RS530,
  8. CLOCK (C): INTERNAL
  9. (Additional Configuration) ENCODING: NRZ
  10. Attach your cables: the KCR1 cable will connect to the USB BERT and the FCR2 cable will connect to the PCIe BERT
  11. Attach the breakout box. This needs to be on the Port A side of the FCR2 cable when using the PCIe BERT
  12. Start (►) the pattern generator using the BERT software
  13. Use your frequency meter to measure the frequency of the clock on pin 17, using the ground reference on pin 7 on the breakout box

Using these settings the expected voltage swing is nominally 0-5V, when unterminated, and the expected measured frequency is 1.024MHz with a variation tolerance of ±100ppm for FarSync Flex V1 or ±25ppm for FarSync Flex V2 and above. If the measured frequency falls outside these limits, the device should be returned to FarSite for recalibration, using the standard FarSite returns procedure. Please contact FarSite support at support@farsite.com if you have any queries.

 

 
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