10-03-2013 02:36 PM - edited 03-04-2019 09:13 PM
We've got a customer with an 887VA who is on VDSL2 and is experiencing very poor upstream sync rates. Downstream sync rate is good.
Looking at the modem stats the upstream power level looks really low, only 3dBm.
Are there some commands I can insert under the controller configuration to force the power level higher? We used to be able to do this on the 877's with ADSL.
(config-controller)#?
Controller configuration commands:
bitswap Bit swap
default Set a command to its defaults
description Controller specific description
diagnostics Diagnostics DELT
exit Exit from controller configuration mode
firmware Active firmware file name
help Description of the interactive help system
modem vdsl modem configuration
no Negate a command or set its defaults
operating Configure auto or specific VDSL operating mode
shutdown Shutdown vdsl controller
sra Seemless Rate Adaption
sync xDSL sync preferences
training Dsl firmware training log
Here are the line stats:
Attainable Rate: 18272 kbits/s 560 kbits/s
Actual Power: 12.7 dBm 3.3 dBm
Per Band Status: D1 D2 D3 U0 U1 U2 U3
Line Attenuation(dB): 24.2 74.6 N/A N/A 59.8 N/A N/A
Signal Attenuation(dB): 24.2 74.6 N/A N/A 57.2 N/A N/A
Noise Margin(dB): 12.4 0.0 N/A N/A 11.9 N/A N/A
02-23-2015 05:46 AM
We have similar numbers on a 2911 router with an ehwic-va-dsl-a:
Attainable Rate: 14600 kbits/s 462 kbits/s
Actual Power: 9.2 dBm 5.9 dBm
Per Band Status: D1 D2 D3 U0 U1 U2 U3
Line Attenuation(dB): 27.7 89.4 102.3 8.9 68.6 64.7 N/A
Signal Attenuation(dB): 27.7 N/A N/A 8.9 0.0 0.0 N/A
Noise Margin(dB): 6.3 N/A N/A 5.4 N/A N/A N/A
We figured it was just line conditions, we're about 1000m from the street cabinet but still think upstream could do better.
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