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Author Topic: Openreach engineer has reset DLM to open profile on my line  (Read 17925 times)

twinkletoes

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Re: Openreach engineer has reset DLM to open profile on my line
« Reply #45 on: September 27, 2018, 04:12:08 PM »

I don't understand the fascination Max has with his sync speed. :hmm:

Steve
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adslmax

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Re: Openreach engineer has reset DLM to open profile on my line
« Reply #46 on: September 27, 2018, 04:24:57 PM »

I have no complaints about sync rate has dropped because I only posted for change in sync for my own record history due to crosstalk.

My cabinet are back in waiting list accordingly to btw dsl checker.  :blush:
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adslmax

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Re: Openreach engineer has reset DLM to open profile on my line
« Reply #47 on: October 02, 2018, 01:08:45 AM »

Code: [Select]
adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    0
Last initialization procedure status:   0
Max:    Upstream rate = 26972 Kbps, Downstream rate = 80588 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 79945 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):        6.5             15.1
Attn(dB):        11.8            0.0
Pwr(dBm):        12.4            0.6

                        VDSL2 framing
                        Bearer 0
MSGc:           -6              26
B:              243             237
M:              1               1
T:              0               42
R:              10              16
S:              0.0972          0.3781
L:              20908           5374
D:              8               1
I:              254             127
N:              254             254
Q:              8               0
V:              0               0
RxQueue:                63              0
TxQueue:                21              0
G.INP Framing:          18              0
G.INP lookback:         21              0
RRC bits:               0               24
                        Bearer 1
MSGc:           186             -6
B:              0               0
M:              2               0
T:              2               0
R:              16              0
S:              5.3333          0.0000
L:              48              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               3830109
OHFErr:         0               165
RS:             3373875640              3087660
RSCorr:         833             901
RSUnCorr:       0               0
                        Bearer 1
OHF:            5123486         0
OHFErr:         0               0
RS:             61481090                0
RSCorr:         71              0
RSUnCorr:       0               0

                        Retransmit Counters
rtx_tx:         148229          0
rtx_c:          1027            0
rtx_uc:         0               0

                        G.INP Counters
LEFTRS:         5               0
minEFTR:        79944           0
errFreeBits:    690538524               0

                        Bearer 0
HEC:            0               0
OCD:            0               0
LCD:            0               0
Total Cells:    4062242395              0
Data Cells:     149983217               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:             0               247
SES:            0               0
UAS:            28              28
AS:             82310

                        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:            80026.79        20063.54

                        Bearer 1
INP:            4.00            0.00
INPRein:        4.00            0.00
delay:          3               0
PER:            16.06           0.01
OR:             95.62           0.01
AgR:            95.62   0.01

Bitswap:        3/3             9/9

Total time = 3 days 11 hours 41 min 34 sec
FEC:            7916            3008
CRC:            0               485
ES:             0               247
SES:            0               0
UAS:            28              28
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 15 minutes time = 11 min 34 sec
FEC:            0               1
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:            0               0
CRC:            0               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 1 day time = 11 hours 41 min 34 sec
FEC:            298             119
CRC:            0               46
ES:             0               39
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 1 day time = 24 hours 0 sec
FEC:            1235            982
CRC:            0               168
ES:             0               72
SES:            0               0
UAS:            28              28
LOS:            0               0
LOF:            0               0
LOM:            0               0
Since Link time = 22 hours 51 min 49 sec
FEC:            833             901
CRC:            0               165
ES:             0               75
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
 >

IP Profile for your line is 77.3Mbps
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dee.jay

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Re: Openreach engineer has reset DLM to open profile on my line
« Reply #48 on: October 02, 2018, 08:11:13 AM »

Actually, I am intrigued.

If the line is obviously that good, how come there is a 6dB SNR? Are you on a Huawei cab?
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adslmax

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Re: Openreach engineer has reset DLM to open profile on my line
« Reply #49 on: October 02, 2018, 10:12:06 AM »

Yes I am on large Huawei cabinet (288) and there is another cabinet to be built due soon.

FTTC Available from 4th February 2014, being expanded by October 2018. Your area is enabled for Superfast Fibre but demand is high on your cabinet right now. This means you may not be able to order fibre today but we're working to increase capacity. Please check back for an update.

The cabinet is on the waiting list. This PCP has a waiters list for FTTC VDSL services. You may place an order which will be dealt with in turn.
« Last Edit: October 02, 2018, 01:57:28 PM by adslmax »
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roseway

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Re: Openreach engineer has reset DLM to open profile on my line
« Reply #50 on: October 02, 2018, 10:42:16 AM »

The SNRM is still ~6 dB because the connection is already effectively at the maximum speed, so a lower SNRM target would achieve nothing.
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  Eric

dee.jay

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Re: Openreach engineer has reset DLM to open profile on my line
« Reply #51 on: October 02, 2018, 10:56:38 AM »

I get that - so would DLM not try and set the SNR lower?

This implies that there must be some threshold that if a line is over X Mb, it will keep the SNR at 6dB.
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adslmax

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Re: Openreach engineer has reset DLM to open profile on my line
« Reply #52 on: October 02, 2018, 10:58:00 AM »

No, DLM never bother to lower SNR even if max rate drop below 78Meg, don't know why. (maybe to do with low interleave by bearer 0 with INPRein: 0.00)
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jelv

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Re: Openreach engineer has reset DLM to open profile on my line
« Reply #53 on: October 02, 2018, 11:19:50 AM »

I get that - so would DLM not try and set the SNR lower?

Are you getting SNR and target SNR confused?

The DLM cannot set the actual SNR which varies as the line conditions vary. What it does is set the minimum SNR to be used when resyncing which is the target.

When the sync occurs the modem negotiates the fastest speed possible where the SNR is equal to or above the target and within the profile cap - so if (as in this case) the cap is 80Mbps - it syncs at that and there is 'spare' SNR which is great as it provides a buffer. When it syncs at the maximum speed for the cap you can't tell what the actual target SNR is - all you know is that it must be lower than the SNR immediately after the sync - so it is possible the target is already 3db.

If he changed to the 55/10 product (or lower) the SNR would be way higher, but the target would still be 6.
« Last Edit: October 02, 2018, 11:22:34 AM by jelv »
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dee.jay

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Re: Openreach engineer has reset DLM to open profile on my line
« Reply #54 on: October 02, 2018, 11:33:51 AM »

No, I wasn't getting it confused, I think I wasn't explaining myself correctly :)

Of course DLM can't set the SNR - it is, as you say, down to the conditions of the individual line itself.

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adslmax

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Re: Openreach engineer has reset DLM to open profile on my line
« Reply #55 on: October 02, 2018, 11:40:33 AM »

I do wish there is special command to force resync via putty and set SNR at 5dB but there is no way to do this way? The only way to get target SNR 3dB is to cap the line at 54999/19999 and wait for DLM to action in 11 or 12 days but there is risky of Bearer 0 with INPRein: 1.00 with high interleave mean IP Profile will drop to 91% to 92% from 96.69%
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niemand

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Re: Openreach engineer has reset DLM to open profile on my line
« Reply #56 on: October 02, 2018, 12:05:34 PM »

Mr Max, don't you have Vivid 350 from Virgin Media now? Why the worry about a couple of megabits here and there with the VDSL?  :)

Permitting customers to start playing with target SNR margins is a bad idea from the Openreach point of view. Given the stories we've seen here of people degrading their services mucking around it would go against the entire point of DLM, to reduce manual intervention and faults, to allow end users to manipulate it.

VDSL is going to be receiving fewer and fewer interventions from Openreach. It is legacy technology now, has been obsolete for a while and the level of investment going into it is minimal.

Regarding your cabinet the chances are there won't be a second one built but either additional line cards / tie pairs to allow use of 5th and 6th cards or an HD upgrade to move it from 288 lines to 384 capacity. By the end of the month is probably too soon for an entirely new cabinet, the delivery times for those are of the order of several months. Be aware that if there is any room for further impact this upgrade is likely to increase crosstalk.
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adslmax

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Re: Openreach engineer has reset DLM to open profile on my line
« Reply #57 on: October 02, 2018, 12:12:46 PM »

I don't have virgin media anymore. Because the speed has dropped to 125Meg from 388Meg every nights, I have cancelled it because lucky me it was on 30 days rolling on with no contract as already sent the hub 3 back to virgin media. Overall disappointed with virgin media unreliable never get 388Meg 24/7. Will never go back to VM don't believe in their speed 388Meg because thinkbroadband speed test show a drop to 125Meg.

I stay with FTTC for now and upgraded to G.Fast soon (probably will choose 160/30 product because 330/50 seem so expensive from openreach)
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dee.jay

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Re: Openreach engineer has reset DLM to open profile on my line
« Reply #58 on: October 02, 2018, 12:15:28 PM »

Damn, 125 from 388 is quite some congestion.
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adslmax

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Re: Openreach engineer has reset DLM to open profile on my line
« Reply #59 on: October 02, 2018, 12:21:17 PM »

Yes it always bad congestion in this area for VM. Awful.
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