Kitz Forum
Broadband Related => Broadband Hardware => Topic started by: sof006 on May 14, 2020, 02:09:20 PM
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====================================================================================
VDSL Training Status: Showtime
Mode: VDSL2 Annex B
VDSL Profile: Profile 17a
G.Vector: Disable
Traffic Type: PTM Mode
Link Uptime: 0 day: 0 hour: 34 minutes
====================================================================================
VDSL Port Details Upstream Downstream
Line Rate: 20.202 Mbps 67.767 Mbps
Actual Net Data Rate: 20.000 Mbps 67.660 Mbps
Trellis Coding: ON ON
SNR Margin: 6.7 dB 6.2 dB
Actual Delay: 0 ms 0 ms
Transmit Power: 1.1 dBm 1.1 dBm
Receive Power: -6.6 dBm 0.3 dBm
Actual INP: 0.0 symbols 0.0 symbols
Total Attenuation: 0.0 dB 13.5 dB
Attainable Net Data Rate: 23.223 Mbps 67.688 Mbps
====================================================================================
VDSL Band Status U0 U1 U2 U3 U4 D1 D2 D3
Line Attenuation(dB): 0.1 14.8 23.1 N/A N/A 8.5 19.4 31.2
Signal Attenuation(dB): 0.1 14.6 23.1 N/A N/A 10.8 19.2 31.2
SNR Margin(dB): 8.8 7.0 6.5 N/A N/A 6.2 6.2 6.2
TX Power(dBm): -6.7 -128.0 0.3 N/A N/A 10.1 7.6 7.3
====================================================================================
VDSL Counters
Downstream Upstream
Since Link time = 34 min 15 sec
FEC: 0 0
CRC: 6 0
ES: 4 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 15 minutes time = 4 min 44 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
Previous 15 minutes time = 15 min 0 sec
FEC: 0 0
CRC: 1 0
ES: 1 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 34 min 44 sec
FEC: 0 0
CRC: 6 0
ES: 4 0
SES: 0 0
UAS: 28 28
LOS: 0 0
LOF: 0 0
LOM: 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
LOM: 0 0
Total time = 34 min 44 sec
FEC: 0 0
CRC: 6 0
ES: 4 0
SES: 0 0
UAS: 28 28
LOS: 0 0
LOF: 0 0
LOM: 0 0
====================================================================================
Likely to see any resync on the DS? Its sat at 6.2dB on SNR for DS (If I am reading correctly). I know 6.2 is very close to 6 so unlikely to see improvement but... thoughts?
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From my experience of a Zyxel VMG8924-B10A (essentially an 8324 with 5Ghz WiFi added) it usually syncs at 6.2 or 6.3dB, so what you are seeing is normal behaviour.
:)
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From my experience of a Zyxel VMG8924-B10A (essentially an 8324 with 5Ghz WiFi added) it usually syncs at 6.2 or 6.3dB, so what you are seeing is normal behaviour.
:)
Really? Thats strange, I mean I guess its not that big of a deal. Also compared to my Vigor 130 the sync is actually slightly lower, about 3Mb which again I find odd because its the exact opposite to what some other people on here are suggesting. Lol oh well, i'll keep it as I like seeing the line stats. I can't do that with the Vigor 130, even after configuring bridge mode on the thing... Its probably something i'm doing wrong.
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Every line is different.
Some see higher syncs with Lantiq chipsets (found in your Draytek) and other lines seem to prefer Broadcom chipsets.
As crosstalk/background noise changes over time which modem gives a higher sync can actually change.
As pointed out above although the target SNRM is meant to be 6dB most modems (certainly every Broadcom chipset) sync at 6.3dB.
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I dunno whether its helpful but I have two of these in service and here are the corresponding numbers :
Heres my Zen one, limited to 40 Mbps
============================================================================
VDSL Band Status U0 U1 U2 U3 D1 D2 D3
Line Attenuation(dB): 5.8 27.8 41.5 N/A 14.2 34.5 53.6
Signal Attenuation(dB): 5.8 27.3 41.1 N/A 19.9 34.2 53.6
SNR Margin(dB): 5.5 5.7 5.6 N/A 12.8 12.8 12.8
Transmit Power(dBm): 0.2 -15.1 6.5 N/A 9.7 7.8 6.4
============================================================================
Heres my Plusnet one limited to 60 Mb
============================================================================
VDSL Band Status U0 U1 U2 U3 D1 D2 D3
Line Attenuation(dB): 5.4 26.7 40.4 N/A 13.8 33.9 51.7
Signal Attenuation(dB): 5.4 26.3 39.7 N/A 19.4 33.6 51.7
SNR Margin(dB): 6.4 6.2 6.1 N/A 9.2 9.2 9.2
Transmit Power(dBm): 0.2 -16.3 6.5 N/A 9.7 7.8 6.9
============================================================================
I guess because both my connections are way below their maximum potential maybe it throws things off (note to self - need to talk to my ISP's)
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Every line is different.
Some see higher syncs with Lantiq chipsets (found in your Draytek) and other lines seem to prefer Broadcom chipsets.
Yup, my Zen line prefers Lantiq (ECI cab) and I can even bring down the SNRm to 3dB perfectly stable.
Chipset: Lantiq™ XWAY™ VRX268
Firmware Version: 5.8.1.8.1.6
API Version: 4.17.18.6
MEI Version: 1.5.17.6
Power Management Mode: L0 - Synchronized
Line State: UP [0x801: showtime_tc_sync]
Line Uptime: 32d 17h 20m 55s
Resyncs: 2
DSLAM/MSAN VID:
XTSE Capabilities: 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2
Annex: B
Line Mode: G.993.2 (VDSL2)
Profile: 17a
Trellis: D: ON / U: ON
Bitswap: D: ON / U: ON
G.INP: D: Not Enabled / U: Not Enabled
Virtual Noise Support: D: Not Supported / U: Not Supported
Attain Data Rate: 76.662 Mb/s / 24.122 Mb/s
Actual Data Rate: 73.993 Mb/s / 20.000 Mb/s
Impulse Noise Prot: 0.0 sym / 0.0 sym
Interleave Delay: 0.0 ms / 0.0 ms
NFEC: 255 / 255
RFEC: 16 / 16
LSYMB: 19851 / 5410
Interleave Depth: 1 / 1
Interleave Block: 255 / 255
LPATH: 0 / 0
Line Attenuation: 12.9dB / 15.5dB
Signal Attenuation: 12.9dB / 15.4dB
Noise Margin: 3.1dB / 8.6dB
Transmit power: 14.7dBm / 6.5dBm
FECS: 6391731 / 240705
ES: 2121 / 37549
SES: 0 / 10
LOSS: 0 / 0
UAS: 73 / 73
HEC: 0 / 0
CRC_P: 0 / 0
CRCP_P: 0 / 0
15m Code Violations: 0 / 0
15m FEC Errors: 366 / 4
1d Code Violations: 26 / 50
1d FEC Errors: 89927 / 210
My Plusnet line also preferred Lantiq sync wise (same cab so no surprise there) but fell foul of DLM and got interleaved when I tried to push 3dB SNRm, even though it appeared to be stable at the time. So I opted it into the G.INP trial and had to switch to Broadcom as Lantiq kept losing sync.
Bearer: 0, Upstream rate = 19555 Kbps, Downstream rate = 58120 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): 6.3 6.0
Attn(dB): 13.7 0.0
Pwr(dBm): 13.7 6.8
VDSL2 framing
Bearer 0
MSGc: -6 13
B: 244 238
M: 1 1
T: 0 64
R: 10 16
S: 0.1337 0.3891
L: 15260 5243
D: 1 1
I: 255 255
N: 255 255
Q: 4 0
V: 3 0
RxQueue: 93 0
TxQueue: 31 0
G.INP Framing: 18 0
G.INP lookback: 31 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 701473277
OHFErr: 0 7837
RS: 1229533812 1922805350
RSCorr: 61229 82880
RSUnCorr: 0 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 2463167434 0
Data Cells: 1709047443 0
Drop Cells: 0
Bit Errors: 0 0
ES: 10 81362
SES: 10 266
UAS: 71 482058
AS: 4365029
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What modem are you using that has the Lantiq VRX268 chipset?
Is that the Home Hub 5A with OpenWRT?
Also when I was with BT, when I was using the Hub 6 at the time I would always sync at 74Mb no matter if I rebooted or replugged. If I attempted to swap it out for anything else I would almost immediately drop to 70Mb, is this because of the chipset used in the hub or would it be because BT can "boost" the speed when using their equipment?
Reason I ask is i'm wondering if I can recreate that again and hit 74Mb again. Baring in mind that Hub 6 (smart hub) used a broadcom chipset I believe.
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What modem are you using that has the Lantiq VRX268 chipset?
Is that the Home Hub 5A with OpenWRT?
Also when I was with BT, when I was using the Hub 6 at the time I would always sync at 74Mb no matter if I rebooted or replugged. If I attempted to swap it out for anything else I would almost immediately drop to 70Mb, is this because of the chipset used in the hub or would it be because BT can "boost" the speed when using their equipment?
Reason I ask is i'm wondering if I can recreate that again and hit 74Mb again. Baring in mind that Hub 6 (smart hub) used a broadcom chipset I believe.
Yes its the HH5a with OpenWRT (see my forum signature) and my line is banded at 73.9Mbit for some reason, although probably wouldn't be stable with less than 3dB SNRm anyway which I'd need to go any faster, but you never know. When I was on ADSL2+ my line would hang on down to 1dB, although there was far less crosstalk back then to cause the SNRm to fluctuate once syned.
I don't think anyone really knows for sure why some chipsets sync quicker than others, maybe better compatibility with the DSLAM at the other end and/or specific line conditions that different modems react in different ways to. It could even be that they report the speed differently and actual throughput would be identical.
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Likely to see any resync on the DS? Its sat at 6.2dB on SNR for DS (If I am reading correctly). I know 6.2 is very close to 6 so unlikely to see improvement but... thoughts?
If you're not on a Huawei cabinet, then its working as normal.
If you are on a Huawei cabinet, you can expect DLM to lower the SNR