Broadband Related > FTTC and FTTP Issues
High CRC Errors on VDSL
mls2992a:
Had BT Infinity installed today and it came with HH6. Swapped it with a HG612 and started seeing packet loss.
Looking at DSL stats, seeing a lot of CRC errors and some ES errors.
--- Quote ---xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 32130 Kbps, Downstream rate = 80228 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 77727 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): 6.8 15.4
Attn(dB): 12.7 0.0
Pwr(dBm): 12.7 1.0
VDSL2 framing
Bearer 0
MSGc: 18 26
B: 239 237
M: 1 1
T: 23 42
R: 0 16
S: 0.0983 0.3781
L: 19536 5374
D: 1 1
I: 240 127
N: 240 254
Counters
Bearer 0
OHF: 2327912 997543
OHFErr: 201273 0
RS: 0 3223596
RSCorr: 0 3
RSUnCorr: 0 0
Bearer 0
HEC: 264209 0
OCD: 6413 0
LCD: 6413 0
Total Cells: 591644711 0
Data Cells: 4185205 0
Drop Cells: 0
Bit Errors: 0 0
ES: 3772 0
SES: 9 0
UAS: 27 27
AS: 3960
Bearer 0
INP: 0.00 0.00
INPRein: 0.00 0.00
delay: 0 0
PER: 1.70 3.98
OR: 112.81 64.22
AgR: 77839.93 20063.54
Bitswap: 1933/1934 0/0
Total time = 1 hours 6 min 27 sec
FEC: 0 3
CRC: 201273 0
ES: 3772 0
SES: 9 0
UAS: 27 27
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 15 minutes time = 6 min 27 sec
FEC: 0 0
CRC: 12238 0
ES: 385 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 2
CRC: 35396 0
ES: 845 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 1 hours 6 min 27 sec
FEC: 0 3
CRC: 201273 0
ES: 3772 0
SES: 9 0
UAS: 27 27
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
Since Link time = 1 hours 5 min 59 sec
FEC: 0 3
CRC: 201273 0
ES: 3772 0
SES: 9 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
--- End quote ---
Not sure if G.INP is enabled. Looking at others output, people had G.INP information which I can't find in the DSL stats output. Looking at xdslcmd vendor information, it is broadcom/Huawei backend.
I would appreciate any advise on how to proceed with this. Ideally I would like to use the HG612 with my own router rather than HH6.
burakkucat:
Welcome to the Kitz forum. :)
--- Quote from: mls2992a on June 16, 2017, 11:15:45 PM ---Had BT Infinity installed today and it came with HH6. Swapped it with a HG612 and started seeing packet loss.
Looking at DSL stats, seeing a lot of CRC errors and some ES errors.
--- End quote ---
A newly provisioned circuit will be operating with a "wide-open" profile, on fast-path. So CRCs and ES will be seen. After the first 24 hours have elapsed, the DLM process will then start gathering data as to the circuit's performance. If the DLM deems it necessary, it will then intervene to stabilise and to optimise the circuit's operation.
--- Quote ---Not sure if G.INP is enabled. Looking at others output, people had G.INP information which I can't find in the DSL stats output. Looking at xdslcmd vendor information, it is broadcom/Huawei backend.
I would appreciate any advise on how to proceed with this. Ideally I would like to use the HG612 with my own router rather than HH6.
--- End quote ---
I can confirm that G.998.4 (originally known as G.Inp) is currently not applied to your circuit. As your circuit terminates on a Huawei DSLAM, the DLM process could apply G.998.4 to your circuit if it would be beneficial.
Using a Huawei HG612 as a pure bridge modem, what do you have connected as the router device? Any device with an EWAN port could be used.
mls2992a:
Thanks :) Kitz has a lot of information regarding HG612 and is really helpful.
--- Quote from: burakkucat on June 17, 2017, 01:51:20 AM ---A newly provisioned circuit will be operating with a "wide-open" profile, on fast-path. So CRCs and ES will be seen. After the first 24 hours have elapsed, the DLM process will then start gathering data as to the circuit's performance. If the DLM deems it necessary, it will then intervene to stabilise and to optimise the circuit's operation.
--- End quote ---
Didn't know that. I was under the understanding that DLM kicks in straight away. Will have to wait and see. hopefully packet losses gets fixed once DLM kicks in.
Coming from Virgin media, latency is amazing, under 10ms to google when Virgin is double that.
--- Quote from: burakkucat on June 17, 2017, 01:51:20 AM ---I can confirm that G.998.4 (originally known as G.Inp) is currently not applied to your circuit. As your circuit terminates on a Huawei DSLAM, the DLM process could apply G.998.4 to your circuit if it would be beneficial.
--- End quote ---
What should I be looking for in stats to see if G.998.4/G.INP has kicked in or not?
--- Quote from: burakkucat on June 17, 2017, 01:51:20 AM ---Using a Huawei HG612 as a pure bridge modem, what do you have connected as the router device? Any device with an EWAN port could be used.
--- End quote ---
running pfsense as a VM on proxmox
Slightly offtopic, is HG612 still considered the best modem for VDSL? Considering the fact, the last DSL firmware update was in 2015 and I believe BT Openreach doesn't provide with new installs anymore.
Also the ports on HG612 are limited to 100Mbps. So I can't enable 1508 MTU for pppoe on pfsense as Intel recommends not to enable baby Jumbo frames (aka 1508 MTU) with the Intel NIC I have. Was able to get around it by running it through a gigabit switch as suggested in this article - https://blog.kingj.net/2017/02/12/how-to/baby-jumbo-frames-rfc-4638-with-igb-based-nics-on-pfsense/
roseway:
--- Quote ---What should I be looking for in stats to see if G.998.4/G.INP has kicked in or not?
--- End quote ---
The easy way is to look in the stats to see if there is a reference to Bearer 1. Looking at your stats in your opening message, only Bearer 0 is there, so you haven't got G.Inp enabled at present.
burakkucat:
--- Quote from: mls2992a on June 17, 2017, 04:04:30 PM ---. . . I was under the understanding that DLM kicks in straight away.
--- End quote ---
You will find a definitive statement in Section 2.2.1, headed "Dynamic Line Management", of BT SIN498 v7.3.
--- Quote ---running pfsense as a VM on proxmox
--- End quote ---
Ah, I see. Thank you.
--- Quote ---Slightly offtopic, is HG612 still considered the best modem for VDSL? Considering the fact, the last DSL firmware update was in 2015 and I believe BT Openreach doesn't provide with new installs anymore.
--- End quote ---
It is always useful to have a spare HG612 available, just in case of "one of those moments". ;)
Take a look at the very first post of this thread. I will suggest that you research the various ZyXEL devices, at the bottom of that list. A number of members use such devices; some configured just as a pure-bridge modem, others configured at a full all-in-one box.
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