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Author Topic: Outgoing FEC upstream errors, how or why..?  (Read 152 times)

snadge

  • Kitizen
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  • Posts: 1188
Outgoing FEC upstream errors, how or why..?
« on: February 02, 2019, 04:33:35 PM »

It is my understanding on xDSL that data is RS encoded and is applied (along with Interleaving) on the downstream, it is then received, deinterleaved, and any data that needs correcting is corrected, data that can not be corrected (CRC). is requested for a re-transmit...  now in the reverse, why do we see upstream FEC errors when the data is outgoing and would only typically have errors at the receiving end?

thanks in advance
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Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 79,000k <-> Atten: 14.2db <-> Snr: 6dB <-> Mode: FastPath

licquorice

  • Reg Member
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  • Posts: 663
Re: Outgoing FEC upstream errors, how or why..?
« Reply #1 on: February 02, 2019, 04:41:32 PM »

It is the DSLAM that is seeing the errors and reporting back to the CPE in the same way that CPE received errors are reported back to the DSLAM.
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snadge

  • Kitizen
  • ****
  • Posts: 1188
Re: Outgoing FEC upstream errors, how or why..?
« Reply #2 on: February 02, 2019, 04:43:22 PM »

It is the DSLAM that is seeing the errors and reporting back to the CPE in the same way that CPE received errors are reported back to the DSLAM.

ahh i see, thanks for that :)
Logged
Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 79,000k <-> Atten: 14.2db <-> Snr: 6dB <-> Mode: FastPath