Random 2MB Drop/Decreased Noise Margin

[flamey]

hi there,

I have had this line activated for around 12months now, initially it was syncing fine at 10mb/1.2 on a dg834gv5 however one day when I reset the router I could only attain a maximum of 8mb, and noticed I had a 4db SNR drop at any time of day. For example, previously I had 11db at 8mb sync now obviously I have 7.

I have tried the normal, switch filters/routers/rj11 and currently syncing with a 7800n therefore decreased upload sync.

I was thinking DLM could have adjusted the INP profile causing this I am at 1/2symbol now but didn't check before. Or perhaps a engineer has messed with something cabinet/exchange, very odd as havn't had this on any other lines previously. Attenuation reported has increased slightly from what I remember, the 834v5 now reports 44db whereas previously I am sure it was around 41db

Wondered if you have any thoughts,

thanks!

Basic stats:

Upstream 870
Downstream 7540
SNR Margin(Upstream) 6.5
SNR Margin(Downstream) 6.1
Line Attenuation(Upstream) 23.5
Line Attenuation(Downstream) 42.0

Detailed Stats:

Link Power State: L0
Mode: ADSL2+
TPS-TC: ATM Mode
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 6.1 6.5
Attn(dB): 42.0 23.5
Pwr(dBm): 6.5 10.6
ADSL2 framing
MSGc: 59 66
B: 234 27
M: 1 4
T: 1 1
R: 16 16
S: 0.9930 3.9689
L: 2022 258
D: 32 8
Counters
SF: 12455357 921153
SFErr: 2323 0
RS: 809598258 544136
RSCorr: 998128 426868882
RSUnCorr: 60986 0

HEC: 1864 0
OCD: 451 0
LCD: 0 0
Total Cells: 3574239934 477232
Data Cells: 822317107 532093
Drop Cells: 0
Bit Errors: 0 0

ES: 2230 4
SES: 13 0
UAS: 104 104
AS: 200999

INP: 1.01 1.98
PER: 16.13 17.86
delay: 7.94 7.93
OR: 32.22 32.25

Bitswap: 8130 3798

Total time = 1 days 10 hours 37 min 24 sec
FEC: 1836155 470450652
CRC: 5153 4
ES: 2230 4
SES: 13 0
UAS: 104 104
LOS: 1 0
LOF: 9 0
Latest 15 minutes time = 7 min 24 sec
FEC: 3549 0
CRC: 13 0
ES: 6 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 4186 4587522
CRC: 9 0
ES: 4 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Latest 1 day time = 10 hours 37 min 24 sec
FEC: 332295 91095406
CRC: 668 0
ES: 300 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 308865 173719477
CRC: 819 0
ES: 413 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Since Link time = 2 days 7 hours 50 min 0 sec
FEC: 998128 426868882
CRC: 2323 0
ES: 1122 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0

[timc]

The thing that I've noticed is that your power is way down ie Pwr(dBm): 6.5 10.6.

This should be more like 12dB & 18dB I believe. Not sure of the reasons for this though.

[rftk]

They did some line upgrade in my area and ever since , I've had no end of trouble , My upstream drops dramatically on a speed check site , just done s test now and it's pulling in 548kbps , the upstream speed is 176k , it's usually around 400kbps , the downside to this is I can't upload anything as it takes forever as i say I had no problems till some upgrade was done a few weeks ago