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Author Topic: FEC Errors with G.INP and interleave depth 4  (Read 6411 times)

burakkucat

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Re: FEC Errors with G.INP and interleave depth 4
« Reply #30 on: September 28, 2017, 03:32:10 PM »

So it seems as if a 4 dB target SNRM is the optimum for your circuit.
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Oldjim

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Re: FEC Errors with G.INP and interleave depth 4
« Reply #31 on: October 09, 2017, 08:59:06 AM »

and the stupid system just dropped it back to 3dB
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Jim
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burakkucat

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Re: FEC Errors with G.INP and interleave depth 4
« Reply #32 on: October 09, 2017, 04:59:46 PM »

As much as I can appreciate the desire to "give the DLM process a good slap", try not to provoke it. You may find that it will revert back to the 4 dB SNRM target without too much drama.
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NewtronStar

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Re: FEC Errors with G.INP and interleave depth 4
« Reply #33 on: October 09, 2017, 10:39:03 PM »

Was very dubious to see this XdB on my circuit but let it do it's own thing and watched it very closely apart from larger FECS counts this circuit has behaved it's self I'm more relaxed now  :)
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shaun1264

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Re: FEC Errors with G.INP and interleave depth 4
« Reply #34 on: October 10, 2017, 07:13:29 PM »

I've been suffering from high amounts of FEC errors in thousands every 15mins with G.INP and interleave of 4.  They seem to build up and up, get worse in time until errored seconds start happening into hundreds in a 15 min period then DLM takes action and increases SNR.  At present i'm on a 4dB.  Early this morning it was 3dB but proved too much with huge amounts of FEC errors and then ES's

Would going into fastpath on G.INP reduce FEC's?
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ejs

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Re: FEC Errors with G.INP and interleave depth 4
« Reply #35 on: October 10, 2017, 08:32:22 PM »

The interleaving depth is largely irrelevant on G.INP. On Huawei cabinets, it's organised so that the interleaving covers one DTU (a DTU being the smallest unit of data that can be retransmitted). On ECI cabinets, it was done with the interleaving depth always set to 1. I think both cabinet types add some FEC when doing G.INP.

So you can't change to "fastpath" on Huawei G.INP, nor would it make any difference to the FEC level anyway.
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