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good or bad?

vic_newey
Grafter
Posts: 802
Thanks: 2
Registered: 30-07-2007

good or bad?

Applied for 1 meg upgrade & had a +net message saying it had been turned down due to line noise, this message was then followed by another saying that it was being resubmitted again due to the new limits, can anyone take a look at my modem report below & let me know - good or bad as I had hoped for 2 meg in near future.

09/10/2004 - 14:51:48 - EVENT = PHYSICAL STATISTICS -
Upstream Output Power = -38 dBm
Upstream Noise Margin = +24.0 dB
Upstream Attenuation = 31.5 dB
Upstream Bits per Frame = 231
Upstream CRC Errors = 0
Upstream FEC Errors = 0
Upstream HEC Errors = 3
Downstream Noise Margin = +13.2 dB
Downstream Attenuation = 31.5 dB
Downstream Bits per Frame = 508
Downstream CRC Errors = 3
Downstream FEC Errors = 0
Downstream HEC Errors = 3
Startup Attempts = 2
09/10/2004 - 14:51:48 - EVENT = AAL STATISTICS - (Receive) -
Good Bytes = 1641648
Good Frames = 2691
Discarded Bytes = 0
Discarded Frames = 0
Timeout Errors = 0
Length Errors = 0
CRC Errors = 0
09/10/2004 - 14:51:48 - EVENT = AAL STATISTICS - (Transmit) -
Good Bytes = 454896
Good Frames = 2153
Discarded Bytes = 0
Discarded Frames = 0
09/10/2004 - 14:51:48 - EVENT = ATM STATISTICS - (Receive) -
Bytes =
7 REPLIES
Community Veteran
Posts: 6,983
Thanks: 8
Registered: 10-04-2007

good or bad?

Your line loss figures look as though it should support the 2M speed but the Signal to Noise Ratio (Downstream Noise Margin = +13.2 dB) is a little on the low side and could possibly cause a problem.
vic_newey
Grafter
Posts: 802
Thanks: 2
Registered: 30-07-2007

good or bad?

not too bad then, can't understand why my request for 1 meg got turned down & then reinstated, don't know if the modem readings are persistant or vary at different times as I have never looked at them before, thanks for info.
Community Veteran
Posts: 6,983
Thanks: 8
Registered: 10-04-2007

good or bad?

The figures you get from the modem are not always accurate and can be out by several dBs.
I am a little suspicious of the ones you have produced because the two loss figures for "Upstream" and "Downstream" are exactly the same.
This is very unusual since two different groups of frequencies are involved here with one much higher than the other so normally much lossier.
I would expect to see around 2dB difference at least between the two.
Community Veteran
Posts: 6,983
Thanks: 8
Registered: 10-04-2007

good or bad?

Just out of interest here are the figures given by my D-Link 504 router.



The upstream SNR is zero because some routers don't have the software built in to talk to the exchange and obtain the figure for that direction.
vic_newey
Grafter
Posts: 802
Thanks: 2
Registered: 30-07-2007

good or bad?

here is another report just taken, there are a couple of differences this time.

09/10/2004 - 17:32:34 - EVENT = PHYSICAL STATISTICS -
Upstream Output Power = -38 dBm
Upstream Noise Margin = +24.0 dB
Upstream Attenuation = 31.5 dB
Upstream Bits per Frame = 230
Upstream CRC Errors = 0
Upstream FEC Errors = 0
Upstream HEC Errors = 0
Downstream Noise Margin = +17.0 dB
Downstream Attenuation = 31.5 dB
Downstream Bits per Frame = 553
Downstream CRC Errors = 0
Downstream FEC Errors = 0
Downstream HEC Errors = 0
Startup Attempts = 1
09/10/2004 - 17:32:34 - EVENT = AAL STATISTICS - (Receive) -
Good Bytes = 123792
Go
Community Veteran
Posts: 6,983
Thanks: 8
Registered: 10-04-2007

good or bad?

The noise figure looks better on that one Smiley
but the losses are the same at 31.5 dB in each direction.
It may be that your particular line is the same both ways its just that its unusual for this to happen.

However it still looks fine for 2meg service Cheesy
vic_newey
Grafter
Posts: 802
Thanks: 2
Registered: 30-07-2007

good or bad?

thanks for that john, I will await the 1 meg first, & then try my luck with 2 Tongue