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Author Topic: FTTC DSLAM  (Read 3515 times)

adslmax

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FTTC DSLAM
« on: March 20, 2019, 01:55:59 PM »

Finally for the first time since 2014. Openreach engineer accepted and let me take a photo of the dslam of the fibre cabinet (pcp 8) as I asked what he was doing as he just connected new line card for the customer. Also I asked him when will g.fast become available, he say around in this July for my g.fast to go live.

Thanks OR for taking my time of this photo.
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adslmax

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Re: FTTC DSLAM
« Reply #1 on: March 20, 2019, 02:18:21 PM »

Went home and checked my connection stats after new card installed at the cabinet

Code: [Select]
xDSL
Mode VDSL2
Traffic Type PTM
Status Up
Link Power State L0
Downstream Upstream
Line Coding (Trellis) On On
SNR Margin (dB) 4.1 7.0
Attenuation (dB) 11.5 0.0
Output Power (dBm) 12.4 -0.3
Attainable Rate (Kbps) 78035 24751
Rate (Kbps) 79999 19999
B (# of bytes in Mux Data Frame) 130 237
M (# of Mux Data Frames in an RS codeword) 1 1
T (# of Mux Data Frames in an OH sub-frame) 0 42
R (# of redundancy bytes in the RS codeword) 8 16
S (# of data symbols over which the RS code word spans) 0.0518 0.3781
L (# of bits transmitted in each data symbol) 21468 5374
D (interleaver depth) 16 1
I (interleaver block size in bytes) 139 127
N (RS codeword size) 139 254
Delay (msec) 0 0
INP (DMT symbol) 48.00 0.00
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adslmax

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Re: FTTC DSLAM
« Reply #2 on: March 20, 2019, 11:27:16 PM »

Overall disappointed with FTTC got worse errored second on downstream clocking up 283 today since the new line card installed for other customer

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 = 27304 Kbps, Downstream rate = 83273 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 79999 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):        5.9             9.7
Attn(dB):        11.5            0.0
Pwr(dBm):        12.4           -0.3

                        VDSL2 framing
                        Bearer 0
MSGc:           -6              26
B:              130             237
M:              1               1
T:              0               42
R:              8               16
S:              0.0518          0.3781
L:              21468           5374
D:              16              1
I:              139             127
N:              139             254
Q:              16              0
V:              14              0
RxQueue:                60              0
TxQueue:                20              0
G.INP Framing:          18              0
G.INP lookback:         20              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               1693887
OHFErr:         4015            1727
RS:             4094112000              3868739
RSCorr:         44729076                438175
RSUnCorr:       0               0
                        Bearer 1
OHF:            79787891                0
OHFErr:         0               0
RS:             957454693               0
RSCorr:         76              0
RSUnCorr:       0               0

                        Retransmit Counters
rtx_tx:         2495484         0
rtx_c:          227402          0
rtx_uc:         21275           0

                        G.INP Counters
LEFTRS:         853             0
minEFTR:        79982           0
errFreeBits:    1563622929              0

                        Bearer 0
HEC:            0               0
OCD:            0               0
LCD:            0               0
Total Cells:    3879476186              0
Data Cells:     3425797207              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:             283             552
SES:            86              5
UAS:            0               0
AS:             1281791

                        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:            80614.82        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:        60221/60221             31589/31604

Total time = 14 days 20 hours 3 min 11 sec
FEC:            44729076                438175
CRC:            4015            1727
ES:             283             552
SES:            86              5
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 15 minutes time = 3 min 11 sec
FEC:            11334           326
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:            45419           2716
CRC:            0               1
ES:             0               1
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 1 day time = 20 hours 3 min 11 sec
FEC:            41846954                258179
CRC:            3806            769
ES:             271             111
SES:            81              5
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 1 day time = 24 hours 0 sec
FEC:            887279          13113
CRC:            209             317
ES:             12              56
SES:            5               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Since Link time = 14 days 20 hours 3 min 11 sec
FEC:            44729076                438175
CRC:            4015            1727
ES:             283             552
SES:            86              5
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
 >

Look like DLM might act tonight?



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burakkucat

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Re: FTTC DSLAM
« Reply #3 on: March 21, 2019, 04:58:54 PM »

I feel I should correct a few facts.
  • An Openreach technician (or engineer, it you wish) does not have access to the cabinet equipped with the electronics (i.e. the DSLAM). It would have been a member of the BT Operate division or a contractor working on BT Operate's behalf.
  • A new line card is not installed for an end-user (i.e. you or me). A line-card has either been swapped out (perhaps due to defective ports) or a new line card has been added to the system, to provide further ports (i.e. a system upgrade). However the statement "he just connected new line card for the customer" could well be correct as the "customer" would be Openreach (i.e. Openreach is the "customer" of BT Operate).
What we see in the above image is a Huawei SmartAX MA5603T MSAN, with all six line card slots fully occupied.
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michty_me

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Re: FTTC DSLAM
« Reply #4 on: March 21, 2019, 08:08:36 PM »

Pretty sure it's well over 1000 ES a day before DLM will make any action.
I would leave it alone. Probably nothing you can do about it either if it's from another customer being added.
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adslmax

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Re: FTTC DSLAM
« Reply #5 on: March 21, 2019, 11:56:49 PM »

What we see in the above image is a Huawei SmartAX MA5603T MSAN, with all six line card slots fully occupied.

How many line card slots are there in the cabinet? there are 24 x 10 = 240 connected mean 48 more connected left before it all full up?
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CarlT

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Re: FTTC DSLAM
« Reply #6 on: March 22, 2019, 02:19:53 AM »

As the post you quoted says there are six line card slots, each with 48 ports on a cabinet that hasn't had the HD extension.

The other 5 cards are probably not full. Openreach try and add capacity before cards are full. If they were full the availability checker would have reflected this and rejected orders until that sixth card was commissioned.

If the sixth card gets close to being full that'll trigger an HD upgrade on the cabinet taking it to a capacity of at least 384 lines via 6 64 port cards.
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CarlT

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Re: FTTC DSLAM
« Reply #7 on: March 23, 2019, 10:12:43 AM »

Incidentally this has minimal, if any, impact on your service. By the time you're getting to 240 connections on the cabinet cross-talk is about as high as it's going to get.

Didn't see much, if any, change began 192 connections here and 600.
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hagrid

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Re: FTTC DSLAM
« Reply #8 on: March 24, 2019, 09:29:09 PM »

Note cabling exists on dummy plates for line cards 4-6 and only half of the ports shown on the right of the picture have filters.
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CarlT

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Re: FTTC DSLAM
« Reply #9 on: March 27, 2019, 12:17:58 PM »

Yep, didn't look very closely. 4-6 are indeed blank.

That third card was for connections 97-144.

Not that surprising. It's a pretty nondescript cabinet in terms of premises passed, less than 350, and has VM coverage.

Pretty slow take up actually. Either VM have the area very much wrapped up or people are content with ADSL. G.fast definitely the right choice, little indication that FTTP would be viable.
« Last Edit: March 27, 2019, 12:21:03 PM by CarlT »
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kitz

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Re: FTTC DSLAM
« Reply #10 on: March 28, 2019, 10:20:08 PM »

First thing I would have done after seeing the SNR & FEC spiking like that is power down the modem and let the port 'rest' for a while.

It's quite well documented on here that it is not unusual for the line to start spiking after it comes back up again after either a remote power down or power outage or power spike.   It's not just limited to FTTC - happens on adsl MSANs too. 
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adslmax

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Re: FTTC DSLAM
« Reply #11 on: March 28, 2019, 10:53:11 PM »

 ;D been told by openreach via this chat https://www.homeandbusiness.openreach.co.uk/chat-with-us that g.fast will go live in July 2019 but they say my property address will not be getting any g.fast because of over 300m away from the cabinet as g.fast are not available to my address. I ask them what next if there is no g.fast for my property? and they say it will rolling out full fibre FTTP by 2033. Meaning I have to wait for next 14 years for that to happen. Remain on FTTC.
« Last Edit: March 28, 2019, 10:55:18 PM by adslmax »
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michty_me

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Re: FTTC DSLAM
« Reply #12 on: March 29, 2019, 10:27:45 AM »

  rolling out full fibre FTTP by 2033. Meaning I have to wait for next 14 years for that to happen. Remain on FTTC.

I think what they meant was everyone to be on full fibre by 2033. You may get it sooner.
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adslmax

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Re: FTTC DSLAM
« Reply #13 on: March 30, 2019, 08:22:52 PM »

I can now see cabinet 8 and 18 are fitted with G.fast pod and cabinet 6 & 9 are the next one to be added on soon.
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adslmax

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Re: FTTC DSLAM
« Reply #14 on: April 04, 2019, 11:19:52 AM »

It's appear Openreach are popping up everywhere in my area for cabinet 6, 7, 8, 9 and 18.

Engineer are working at the g.fast cabinet yesterday for almost 3 hours back and forward.

Today a new cabinet 9 for g.fast is installed.

« Last Edit: April 04, 2019, 03:56:41 PM by adslmax »
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