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Standard User deleted
(deleted) Fri 16-Aug-19 18:07:45
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FTTC FEC with G.INP enabled


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A quick question, Am I right in saying if G.INP is enabled on the down&up then FEC's rate will be higher?
Standard User j0hn83
(fountain of knowledge) Fri 16-Aug-19 21:14:28
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Re: FTTC FEC with G.INP enabled


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Higher compared to what?

The downstream FEC and upstream FEC are independent of each other.
Upstream G.INP being enabled shouldn't effect the downstream FEC.

The amount of FEC error correction can also be changed by the DLM.
You need to look up the R and N value on a modem with detailed statistics to see the redundancy/overhead applied.

For me right now my stats show.
VDSL2 framing
Bearer 0
MSGc: -6 26
B: 235 207
M: 1 1
T: 0 39
R: 12 10
S: 0.0000 0.9213
L: 11731 1893
D: 8 1
I: 248 109
N: 248 218
Q: 8 0
V: 1 0


That shows 12 bytes out of every 248 used for FEC correction downstream, and 10 bytes out of 218 upstream.
DLM can change these values which effects the amount of FEC you see.
The R and N values for the downstream may have changed when upstream G.INP was enabled.

With my line I get roughly 1,000 FEC/min most of the time but it often jumps to 10,000/min for hours/days at a time.

I've had 1.4 million FEC/min for a couple weeks with almost zero CRC/ES in that time.

FEC's are errors that were corrected before they happened so nothing to worry about.

Edited by j0hn83 (Fri 16-Aug-19 21:16:52)

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