hi there guys,
I'd like to hear your opinion on my FTTC line stats, just to give you a bit of background...
Had the service installed on Jun 12th, started perfect, i have the 40/10 w/ Sky, 39996/9996 sync, ping 12ms, happy. Then on sunday 16th connection went down for like 10 mins and when it came back DLM kicked in and lowered the speed to 27400 / 9996.
....long story short, i had a BT engineer check the line on the following wed, said everything is OK, he checked the sync with his tool and it shown 35000 and during these past weeks connection improved, speed changed a bit, I have restarted it maybe just once (so it was up for 28 days which i thought was the logging period as the BT guy said b4 they reset stats...) first ping changed, then download speed a bit, then upload, then right now it seems to be stuck on the following 35000 / 9996 and 13ms ping which is actually good and very stable, solid.
However, i'd like to understand why i am not getting the 39996 i had before, some people said sometimes DLM recovers in UP TO 6 weeks, but is that a myth or is really like that?
Interestingly, i am 150mts walking distance from the nearest BT fibre cabinet, no strange plugs or extensions and the BT engineer also told me "you should get good speed indeed", and i often walk past it just behind the corner
BTW i removed QoS as someone suggested here and had a nice boost in the upload, nice trick!!!! Is there any drawback by doing so?
here are my stats:
# xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 10908 Kbps, Downstream rate = 46704 Kbps
Path: 0, Upstream rate = 9995 Kbps, Downstream rate = 35000 Kbps
Link Power State: L0
Mode: VDSL2 Annex B
VDSL2 Profile: Profile 17a
TPS-TC: PTM Mode
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 8.5 6.4
Attn(dB): 0.0 0.0
Pwr(dBm): 12.0 -6.6
VDSL2 framing
Path 0
B: 239 235
M: 1 1
T: 64 7
R: 0 16
S: 0.2182 0.7508
L: 8799 2717
D: 1 1
I: 240 255
N: 240 255
Counters
Path 0
OHF: 1474773 437016
OHFErr: 40 17
RS: 0 1756802
RSCorr: 0 80
RSUnCorr: 0 0
Path 0
HEC: 9 0
OCD: 0 0
LCD: 0 0
Total Cells: 347593607 0
Data Cells: 4759952 0
Drop Cells: 0
Bit Errors: 0 0
ES: 28 16
SES: 0 0
UAS: 215 215
AS: 5169
Path 0
INP: 0.00 0.00
PER: 3.49 11.82
delay: 0.00 0.00
OR: 59.57 152.21
Bitswap: 4 1
Total time = 1 hours 30 min 44 sec
FEC: 0 0
CRC: 40 0
ES: 28 16
SES: 0 0
UAS: 215 215
LOS: 0 0
LOF: 0 0
Latest 15 minutes time = 44 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 0 0
CRC: 4 0
ES: 2 3
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Latest 1 day time = 1 hours 30 min 44 sec
FEC: 0 0
CRC: 40 0
ES: 28 16
SES: 0 0
UAS: 215 215
LOS: 0 0
LOF: 0 0
Previous 1 day time = 0 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Since Link time = 1 hours 26 min 7 sec
FEC: 0 80
CRC: 40 17
ES: 28 16
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
#
# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 10924 Kbps, Downstream rate = 46704 Kbps
Path: 0, Upstream rate = 9995 Kbps, Downstream rate = 35000 Kbps
Discovery Phase (Initial) Band Plan
US: (0,95) (880,1195) (1984,2771)
DS: (32,859) (1216,1959) (2792,4083)
Medley Phase (Final) Band Plan
US: (0,95) (880,1195) (1984,2771)
DS: (32,859) (1216,1959) (2792,4083)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 10924 kbps 46704 kbps
Actual Aggregate Tx Power: - 6.6 dBm 12.0 dBm
============================================================================
VDSL Band Status U0 U1 U2 U3 D1 D2 D3
Line Attenuation(dB): 0.1 7.3 10.5 N/A 4.5 10.3 18.4
Signal Attenuation(dB): 0.1 7.3 10.4 N/A 4.5 10.3 18.4
SNR Margin(dB): 6.8 6.9 6.1 N/A 8.6 8.5 8.4
TX Power(dBm): -11.3 -128.0 -8.4 N/A 9.9 7.4 0.8 7.4 0.8
when i look at the MAX speed the line supports, it doesn't look great since im so close to the cabinet, what is your diagnosis? bad cables?
- these stats are from this morning, i just rechecked them now and this is what i get, apparently showing that is going up slowly?
Max: Upstream rate = 10978 Kbps, Downstream rate = 46852 Kbps
Path: 0, Upstream rate = 9995 Kbps, Downstream rate = 35000 Kbps
- as you can see from the stats, i had restarted the BTO modem this morning
- since the last engineer visit on june 19 (he went to the cabinet, he did "something", DSL light and phone went down like 5 minutes), i have restarted it just a few days ago (so it stayed up like 4 weeks), i just did a "reset" with the button to see if things would change but no
thanks a lot guys!
Gabrio
With your line attenuation as low as it is across all the bands I'm surprised by the low sync. I would say your D side (line) is no more than 200 meters in length and should be up for a bit more.
You have 8.5dB SNR margin which is a big higher than expected and should be around 6.
I would say the engineer you had was one of the many useless ones that BT employ and doesn't have a clue, I would bagger sky for a resolution.
