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Adventurer
Adventurer
294 Views
Registered: ‎09-25-2017

GTH TX to 75 Ohm coaxial cable @12Gbps

Hi,

  Can anyone recommend a solution to interface GTH Tx to 75 Ohm coaxial cables @12Gbps?  And similarly for the other direction.  Either using active devices or passive networks.  

  I have tried SDI and CoaxPress 12G transceivers, but IBERT test does not work over them.  I suspect their built-in reclocker function is line encoding sensitive and rejects the pseudo random data used for IBERT test.  CoaxPress uses 8B/10B and SDI uses its own scrambling algo.  

Regards,

Neo

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6 Replies
Scholar drjohnsmith
Scholar
292 Views
Registered: ‎07-09-2009

Re: GTH TX to 75 Ohm coaxial cable @12Gbps

Assuming your looking at SDI video ?

have you looked at the SDI video dirver / receivers ?

e.g.   LMH1219

 

 

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Adventurer
Adventurer
263 Views
Registered: ‎09-25-2017

Re: GTH TX to 75 Ohm coaxial cable @12Gbps

Hi John,

  I had tried Macom and Semtech SDI 12G TX and RX ICs.  I could not get IBERT link up with them.  I am sure the Macom SDI hardware is working because I can send 12G SDI video over them.  I am surprised when I switch to IBERT I can't even get a link up.

  Their datasheet mentioned it has built-in reclockers, so I suspect these ICs will detect for SDI standard's own line coding before turning on their outputs

Regards,

Neo

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Scholar drjohnsmith
Scholar
242 Views
Registered: ‎07-09-2009

Re: GTH TX to 75 Ohm coaxial cable @12Gbps

Do you have the macom parts with the built in eye checker ?

thats normaly a good start point,

provided the iBert is at the correct clock frequency, why should not the buffers work ? 

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Adventurer
Adventurer
216 Views
Registered: ‎09-25-2017

Re: GTH TX to 75 Ohm coaxial cable @12Gbps

Hi John,

  My intent is to use SDI transmitter and receivers to send non-SDI data and to convert GT differential signals to 75 Ohm coax signals.  So I use FPGA IBERT as a test to see if these transceivers allows non-SDI signals to pass through.

  I believe besides frequency, SDI reclockers are actually line encoding sensitive.  I hope someone can confirm/refute this.

Regards,

Neo

Xilinx Employee
Xilinx Employee
212 Views
Registered: ‎08-07-2007

Re: GTH TX to 75 Ohm coaxial cable @12Gbps

hi wtneo@leica 

 

maybe you can check with Macom and Semtech to see if the PRBS pattern is allowed in the reclockers.

 

Thanks,

Boris

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Adventurer
Adventurer
197 Views
Registered: ‎09-25-2017

Re: GTH TX to 75 Ohm coaxial cable @12Gbps

Hi Boris,

  Yeah working on that.  Meanwhile I am also asking if anyone knows of other solutions.

Regards,

Neo

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