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FTTC stability issues (Cisco C897VA-K9)

aix

Member
I've been having issues with my FTTC line. For about two years it was syncing at 20 Mbps down and was stable. Recently it went to DLM-imposed 10 Mbps. I spoke to the ISP (Zen) who reset the DLM.

The line is now syncing at around 20Mbps but is not very stable.

You lot are very knowledgeable, so I thought I'd ask here in case anyone is able spot any issues with the below or suggest troubleshooting strategies. Thanks!!!

P.S. I am about a kilometre away from the cabinet (wire length).

Code:
cisco-c897va-k9# show controllers vdsl 0
Controller VDSL 0 is UP

Daemon Status:           Up

                        XTU-R (DS)              XTU-C (US)
Chip Vendor ID:         'BDCM'                   'BDCM'
Chip Vendor Specific:   0x0000                   0xC190
Chip Vendor Country:    0xB500                   0xB500
Modem Vendor ID:        'CSCO'                   '    '
Modem Vendor Specific:  0x4602                   0x0000
Modem Vendor Country:   0xB500                   0x0000
Serial Number Near:    (redacted) C897VA-K 15.4(3)M4
Serial Number Far:     Q10K1002039_22
Modem Version Near:    15.4(3)M4
Modem Version Far:     0xc190

Modem Status:            TC Sync (Showtime!)

DSL Config Mode:         AUTO
Trained Mode:   G.993.2 (VDSL2) Profile 17a
TC Mode:                 PTM
Selftest Result:         0x00
DELT configuration:      disabled
DELT state:              not running

Full inits:             15
Failed full inits:      0
Short inits:            0
Failed short inits:     7

Firmware        Source          File Name
--------        ------          ----------
VDSL            default         flash:vdsl.bin

Modem FW  Version:      140729_1209-4.02L.03.A2pv6C039m.d24h
Modem PHY Version:      A2pv6C039m.d24h
Trellis:                 ON                       ON
SRA:                     enabled                 enabled
 SRA count:              14                      13
Bit swap:                enabled                 enabled
 Bit swap count:         70                      673
Line Attenuation:         0.0 dB                  0.0 dB
Signal Attenuation(dB): 23.6    59.8    N/A     9.2     47.1    0.0     N/A
Noise Margin(dB):       5.8     6.7     N/A     6.0     5.9     N/A     N/A
Total FECC:             821296050                        2839
Total ES:               8577                     208
Total SES:              3220                     0
Total LOSS:             14                       0
Total UAS:              485                      485
Total LPRS:             0                        0
Total LOFS:             20                       0
Total LOLS:             0                        0


                  DS Channel1     DS Channel0   US Channel1       US Channel0
Speed (kbps):             0            23163             0              6959
SRA Previous Speed:       0            24045             0              7000
Previous Speed:           0            24045             0              7000
Reed-Solomon EC:       1501        371595499             0                76
CRC Errors:          211745           211745           223               223
Header Errors:            0                0             0                 0
Interleave (ms):       0.00             0.00          0.00              0.00
Actual INP:            2.01            44.00          0.00              0.00

Training Log :  Stopped
Training Log Filename : flash:vdsllog.bin

Code:
cisco-c897va-k9#sh run | sec controller
controller VDSL 0
 operating mode vdsl2
 modem ukfeature
 modem customUKAnnexM
 modem customUKAnnexA
 sra
 

Mark.J

Administrator
Staff member
ISPreview Team
On the SNR and Attenuation, which are the upstream and which are the downstream figures? Some routers swap them around, so labelling is important. But from the sheer volume of FECC errors, I'm not surprised you're having problems if those are recent figures.
 

kommando828

ULTIMATE Member
Is the line noisy, I got better response from OR engineers if there was noise on the line and it was reported as a noisy line rather than a sync/download issue. But that was with ISP's too afraid to get OR out for broadband faults which Zen do not seem to be.
 
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