General Discussion
  >> Fibre Broadband


Register (or login) on our website and you will not see this ad.


Pages in this thread: 1 | 2 | (show all)   Print Thread
Standard User bdav
(newbie) Sat 13-Mar-21 18:50:55
Print Post

2 Lines - One Brand New, Same Modem, 11meg Slower.


[link to this post]
 
Just had a new line installed 2 days ago (AAISP service over the top of it), next to an existing PlusNet line. The new line is a brand new cable strung from the top of the pole, with a new NTE5C and filtered face plate. Both lines are using HG612 with the same firmware, and indeed have had both flipped around.

The PlusNet (Old) line has a Downstream Line Rate of 71,135 and Attainable of 68,536, but the new line appears to only be getting 59,450 Line / 58,476 Attainable. This is (almost exactly) the bottom of the Impacted / Range B estimate.

The SNR Margin (14.4) / Line attenuation (13.4) are exactly the same for both lines as reported by the HG612 (B030SP08).

Is there any reason this should be syncing so much lower? I left it a long while before trying switches of the modem, and even when I did that only did it once. The Attainable rose 1mbps in the first few hours, but has been rock stable since.

Is this a difference in how the providers configure the lines (TT Backhaul for the new), or is there likely something wrong here?

Any more dumps from either / both HG612 available on request!
Standard User Realalemadrid
(committed) Sat 13-Mar-21 20:16:53
Print Post

Re: 2 Lines - One Brand New, Same Modem, 11meg Slower.


[re: bdav] [link to this post]
 
Where are you getting the stats for the two lines, those SNRM values are way off. The only accurate stats on the HG612 are by using a telnet session and the various xdslcmd variants. A lot of the the Web GUI stats are incorrect.

Of course you need to have the unlocked firmware to be able to access the detailed stats.

Edited by Realalemadrid (Sat 13-Mar-21 20:33:23)

Standard User bdav
(newbie) Sat 13-Mar-21 22:09:42
Print Post

Re: 2 Lines - One Brand New, Same Modem, 11meg Slower.


[re: Realalemadrid] [link to this post]
 
Both are unlocked - Can grab anything of use!

Plusnet (faster line):

# xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 23370 Kbps, Downstream rate = 68536 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 71135 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Link Power State: L0
Mode: VDSL2 Annex B
VDSL2 Profile: Profile 17a
TPS-TC: PTM Mode(0x0)
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 2.8 14.1
Attn(dB): 14.3 0.0
Pwr(dBm): 13.4 5.1
VDSL2 framing
Bearer 0
MSGc: -6 26
B: 243 237
M: 1 1
T: 0 42
R: 10 16
S: 0.1092 0.3781
L: 18604 5374
D: 8 1
I: 254 127
N: 254 254
Q: 8 0
V: 0 0
RxQueue: 57 0
TxQueue: 19 0
G.INP Framing: 18 0
G.INP lookback: 19 0
RRC bits: 0 24
Bearer 1
MSGc: 154 -6
B: 0 0
M: 2 0
T: 2 0
R: 16 0
S: 6.4000 0.0000
L: 40 0
D: 3 0
I: 32 0
N: 32 0
Q: 0 0
V: 0 0
RxQueue: 0 0
TxQueue: 0 0
G.INP Framing: 0 0
G.INP lookback: 0 0
RRC bits: 0 0
Counters
Bearer 0
OHF: 0 1598899
OHFErr: 0 719
RS: 2668650288 652786
RSCorr: 483126 20695
RSUnCorr: 0 0
Bearer 1
OHF: 11884326 0
OHFErr: 0 0
RS: 118842646 0
RSCorr: 879 0
RSUnCorr: 0 0

Retransmit Counters
rtx_tx: 44803 0
rtx_c: 15283 0
rtx_uc: 78137 0

G.INP Counters
LEFTRS: 112 0
minEFTR: 71130 0
errFreeBits: 1199862248 0

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 343820001 0
Data Cells: 264648978 0
Drop Cells: 0
Bit Errors: 0 0

Bearer 1
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 0 0
Data Cells: 0 0
Drop Cells: 0
Bit Errors: 0 0

ES: 25 4226
SES: 20 0
UAS: 102 82
AS: 190896

Bearer 0
INP: 48.00 0.00
INPRein: 0.00 0.00
delay: 0 0
PER: 0.00 3.98
OR: 0.01 64.22
AgR: 71208.07 20063.54

Bearer 1
INP: 4.50 0.00
INPRein: 4.50 0.00
delay: 3 0
PER: 16.06 0.01
OR: 79.68 0.01
AgR: 79.68 0.01

Bitswap: 147875/147875 4220/4226

Total time = 1 days 5 hours 47 min 33 sec
FEC: 1310664 52615
CRC: 1094 4561
ES: 25 4226
SES: 20 0
UAS: 102 82
LOS: 2 0
LOF: 16 0
LOM: 0 0
Latest 15 minutes time = 2 min 33 sec
FEC: 314 3
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 1948 1
CRC: 0 7
ES: 0 6
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 5 hours 47 min 33 sec
FEC: 55644 10116
CRC: 0 80
ES: 0 75
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 214854 7810
CRC: 0 315
ES: 0 296
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 2 days 5 hours 1 min 35 sec
FEC: 483126 20695
CRC: 0 719
ES: 0 665
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0


PBPARAMS:
# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 23370 Kbps, Downstream rate = 68536 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 71135 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Discovery Phase (Initial) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3959)
Medley Phase (Final) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3959)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 23370 kbps 68536 kbps
Actual Aggregate Tx Power: 5.1 dBm 13.4 dBm
====================================================================================
VDSL Band Status U0 U1 U2 U3 U4 D1 D2 D3
Line Attenuation(dB): 5.2 17.5 25.0 N/A N/A 9.3 21.5 32.9
Signal Attenuation(dB): 5.2 16.8 24.3 N/A N/A 12.5 21.3 32.9
SNR Margin(dB): 14.1 14.2 14.1 N/A N/A 2.8 2.8 2.8
TX Power(dBm): -9.7 -26.6 5.1 N/A N/A 10.4 7.8 6.9



AA/TT (Slower):
# xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 21631 Kbps, Downstream rate = 58704 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 59450 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Link Power State: L0
Mode: VDSL2 Annex B
VDSL2 Profile: Profile 17a
TPS-TC: PTM Mode(0x0)
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 6.2 7.2
Attn(dB): 14.4 0.0
Pwr(dBm): 13.5 5.7
VDSL2 framing
Bearer 0
MSGc: -6 26
B: 243 237
M: 1 1
T: 0 42
R: 10 16
S: 0.1307 0.3781
L: 15548 5374
D: 8 1
I: 254 127
N: 254 254
Q: 8 0
V: 0 0
RxQueue: 48 0
TxQueue: 16 0
G.INP Framing: 18 0
G.INP lookback: 16 0
RRC bits: 0 24
Bearer 1
MSGc: 122 -6
B: 0 0
M: 2 0
T: 2 0
R: 16 0
S: 8.0000 0.0000
L: 32 0
D: 1 0
I: 32 0
N: 32 0
Q: 0 0
V: 0 0
RxQueue: 0 0
TxQueue: 0 0
G.INP Framing: 0 0
G.INP lookback: 0 0
RRC bits: 0 0
Counters
Bearer 0
OHF: 0 1516780
OHFErr: 0 769
RS: 1514949544 1500277
RSCorr: 3923 16436
RSUnCorr: 0 0
Bearer 1
OHF: 11864280 0
OHFErr: 0 0
RS: 94913743 0
RSCorr: 319 0
RSUnCorr: 0 0

Retransmit Counters
rtx_tx: 1007 0
rtx_c: 771 0
rtx_uc: 131355 0

G.INP Counters
LEFTRS: 35 0
minEFTR: 59431 0
errFreeBits: 225242137 0

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 312414217 0
Data Cells: 298508683 0
Drop Cells: 0
Bit Errors: 0 0

Bearer 1
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 0 0
Data Cells: 0 0
Drop Cells: 0
Bit Errors: 0 0

ES: 35 783
SES: 34 0
UAS: 1126391 1126357
AS: 190570

Bearer 0
INP: 49.00 0.00
INPRein: 0.00 0.00
delay: 0 0
PER: 0.00 3.98
OR: 0.01 64.22
AgR: 59511.03 20063.54

Bearer 1
INP: 2.00 0.00
INPRein: 2.00 0.00
delay: 0 0
PER: 16.06 0.01
OR: 63.75 0.01
AgR: 63.75 0.01

Bitswap: 74272/74272 1376/1377

Total time = 1 days 9 hours 53 min 56 sec
FEC: 8168 16533
CRC: 1863 844
ES: 35 783
SES: 34 0
UAS: 1126391 1126357
LOS: 2 0
LOF: 30 0
LOM: 10 0
Latest 15 minutes time = 8 min 56 sec
FEC: 21 16
CRC: 0 5
ES: 0 5
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 8 1
CRC: 0 4
ES: 0 4
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 9 hours 53 min 56 sec
FEC: 709 247
CRC: 0 148
ES: 0 142
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 2456 13388
CRC: 0 331
ES: 0 312
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 2 days 4 hours 56 min 9 sec
FEC: 3923 16436
CRC: 0 769
ES: 0 714
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0


pbparams:
xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 21631 Kbps, Downstream rate = 58704 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 59450 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Discovery Phase (Initial) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3959)
Medley Phase (Final) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3959)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 21631 kbps 58704 kbps
Actual Aggregate Tx Power: 5.7 dBm 13.5 dBm
====================================================================================
VDSL Band Status U0 U1 U2 U3 U4 D1 D2 D3
Line Attenuation(dB): 5.0 18.2 25.9 N/A N/A 9.4 21.9 33.2
Signal Attenuation(dB): 5.0 17.6 25.2 N/A N/A 12.4 21.7 33.2
SNR Margin(dB): 7.2 7.2 7.2 N/A N/A 6.2 6.2 6.2
TX Power(dBm): -9.7 -25.4 5.5 N/A N/A 10.5 8.0 6.7


Register (or login) on our website and you will not see this ad.

Standard User ft247
(regular) Sat 13-Mar-21 22:39:58
Print Post

Re: 2 Lines - One Brand New, Same Modem, 11meg Slower.


[re: bdav] [link to this post]
 
I'm not familiar with the HG612s but it looks like the faster line could have a 3dB SNRM target whereas the slower has a 6dB target.

Are you on a Huawei cabinet? If so it could be a case of waiting for your SNRM target to drop.

If you're on an ECI cabinet the target SNRM is still, I believe, fixed to 6dB on all lines.
Standard User zzing123
(member) Sat 13-Mar-21 22:44:33
Print Post

Re: 2 Lines - One Brand New, Same Modem, 11meg Slower.


[re: bdav] [link to this post]
 
Nothing immediately obvious, I'm afraid. Check the cable from modem to NTE isn't too tightly coiled and all that will be the first thing.

How long has the line been live? DLM may still be doing it's shenanigans. Your line seems to also be doing a lot of ReTX (which means vectoring is enabled, and that can also be a 'tuning' thing over time). I don't have vectoring on my line so I don't know much about it, although others might.

The "UAS: 1126391 1126357" are unrecovered errors - serious if you see them after the line is more than 10 days old, and something you can whinge about to the ISP. But as you've not had any for over a day, it may have just been a case of wibbles when the line first went live (normal). A good old fashioned reboot will zero that figure.

The other thing you have is a bit of interleaving with an interleave depth of 8 on download (the 'D: 8 1' line). If you want to blitz this, I know it's counterintuitive, but actually force your modem to sync at a slower sync speed, as this will 'trick' DLM into blitzing that pesky interleave depth you have (the 'D: 8 1' should become 'D: 1 1') on both lines. The command to do this is:

xdslcmd configure -maxDataRate 48000 20000 1000000

This will force the modem to sync at 48000kbps (48meg), which is about 70% of you attainable line. Leave it alone until the interleave is zero'd (if it doesn't happen, ask your ISP to reset your line profile), then increase it by 5% once a day (otherwise DLM will think there is a problem). While it may be a little slower in absolute figures, your latency will be markedly lower as will your pings, and everything considerably snappier.
Standard User MHC
(sensei) Sat 13-Mar-21 22:48:54
Print Post

Re: 2 Lines - One Brand New, Same Modem, 11meg Slower.


[re: bdav] [link to this post]
 
As suggested, SNR of 2.8dB on the faster line (target at sync 3,0) and 6.2 dB (target 6.0) on the second. 12Mbps difference - wait for the second to stabilise to 3dB and most of that will disappear and the second will have around 68-72 Mbps. It may take a week, maybe two or three but it should, if you don't mess around, finally give two lines with similar performance.


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

M H C


taurus excreta cerebrum vincit
Standard User Realalemadrid
(committed) Sat 13-Mar-21 22:55:33
Print Post

Re: 2 Lines - One Brand New, Same Modem, 11meg Slower.


[re: bdav] [link to this post]
 
OK you got the SNRM values the wrong way round. G.Inp is enabled on both lines, the faster line is on 3dB SNRM. The slower one is still on 6dB, give it a week or so and DLM should reduce it to 3db so your lines should have similar speeds then. Not much else to worry about,
those UAS values are some misreporting by the modem, they are Unavailable seconds, that is times when the modem is syncing up and not transferring data, nothing to do with unrecoverable errors.

Edited by Realalemadrid (Sat 13-Mar-21 23:03:21)

Standard User bdav
(newbie) Sun 14-Mar-21 08:06:04
Print Post

Re: 2 Lines - One Brand New, Same Modem, 11meg Slower.


[re: zzing123] [link to this post]
 
Thanks for the pointer on this - Is there any chance the interleaving will disappear of its own accord, or is it stuck there? Will chopping around with the sync speed stop/delay the gradual natural increase of it?
Standard User bkehoe
(newbie) Sun 14-Mar-21 10:23:16
Print Post

Re: 2 Lines - One Brand New, Same Modem, 11meg Slower.


[re: bdav] [link to this post]
 
You don't have traditional interleaving, you have G.INP active which is your friend, and it is active on both lines ( see https://kitz.co.uk/adsl/retransmission.htm ). If it's removed your speed will drop. Without this being active DLM will not eventually gradually lower the SNR in stages as it monitors stability each step of the way. Limiting your line speed manually is a technique best used to get rid of ReTx High if it doesn't go away by itself once your line stabilises at 3dB. You're best just leaving everything sat there powered on, no switching around, config changes or power cycles for what could be a few weeks.
Standard User bdav
(newbie) Sun 14-Mar-21 11:17:29
Print Post

Re: 2 Lines - One Brand New, Same Modem, 11meg Slower.


[re: bkehoe] [link to this post]
 
Yes think thats what I'll do for now and keep my fingers crossed - At least if it doesn't sort itself out AA are pretty good at beating up OR.

My latency sits at a rock solid 5.8-6.2 ms to the AA PPPoE endpoint, and 7ms to google DNS so seems its not having that big an effect on things!

Edited by bdav (Sun 14-Mar-21 11:23:08)

Pages in this thread: 1 | 2 | (show all)   Print Thread

Jump to