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[jeffers]

Hello all!

FTTC has been enabled about a month ago for my cab (i was the first on it), and theres about 250m of cable between my house and the cab (~130m as the crow flies) so I think I should be getting pretty close to the full 80Mbit. On the initial install date the BTO engineer also said I should get the full 80. Anyway, due to some issues with PlusNet I ended up rebooting my plusnet router a load of times (but not the original ECI Openreach modem) for the first day or so of being live. I hope this wouldnt have caused DLM or anything to kick in. When PlusNet fixed my account my first speedtests looked fine - 72Mbit pretty consistently. Shortly afterwards my speeds dropped and have settled around the 65Mbit mark...

http://www.speedtest.net/results.php?sh=351f211f4b6ab6803c5bead4746a12ac&ria=0

I've finally replaced the original ECI modem and hooked up an unlocked HG612. Without knowing much about FTTC yet, I can see that my max attainable speed is pretty much my current sync speed...

Code: [Select]

# xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 23897 Kbps, Downstream rate = 64616 Kbps
Bearer: 0, Upstream rate = 18999 Kbps, Downstream rate = 66237 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): 5.8 9.0
Attn(dB): 18.3 0.0
Pwr(dBm): 13.4 6.7
VDSL2 framing
Bearer 0
MSGc: 18 137
B: 239 236
M: 1 1
T: 23 6
R: 0 16
S: 0.1153 0.3974
L: 16648 5134
D: 1 1
I: 240 255
N: 240 255
Counters
Bearer 0
OHF: 3068797 935059
OHFErr: 90 0
RS: 0 1565223
RSCorr: 0 1
RSUnCorr: 0 0

Bearer 0
HEC: 100 0
OCD: 5 0
LCD: 5 0
Total Cells: 780245879 0
Data Cells: 7686592 0
Drop Cells: 0
Bit Errors: 0 0

ES: 43 133
SES: 0 3
UAS: 27 240522
AS: 6130

Bearer 0
INP: 0.00 0.00
INPRein: 0.00 0.00
delay: 0 0
PER: 1.99 6.58
OR: 96.13 173.80
AgR: 66332.88 19172.57

Bitswap: 4860/4861 6/7

Total time = 1 hours 42 min 37 sec
FEC: 0 1
CRC: 90 0
ES: 43 133
SES: 0 3
UAS: 27 240522
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 15 minutes time = 12 min 37 sec
FEC: 0 0
CRC: 5 0
ES: 4 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: 24 0
ES: 9 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 1 hours 42 min 37 sec
FEC: 0 1
CRC: 90 0
ES: 43 133
SES: 0 3
UAS: 27 240522
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 42 min 9 sec
FEC: 0 1
CRC: 90 0
ES: 43 133
SES: 0 3
UAS: 0 240495
LOS: 0 0
LOF: 0 0
LOM: 0 0

My internal wiring is fairly minimal and I dont hear any noise on my line.

Have I just got unrealistic expectations or is there likely a problem somewhere?

Thanks
Jeffers

[Dray]

Which firmware is on that HG612 ?

[jeffers]

Which firmware is on that HG612 ?

Oops, forgot about that..

Code: [Select]

# equipcmd swversion display
software version: V100R001C01B030SP08
xdsl firmware version: A2pv6C038m.d24j
cpu version: BCM6368
cfe version: 1.0.37-102.6

[ip75]

The attenuation looks a bit high for a 250m line. My line is about that length and I have attenuation of around 11db. The stats seem consistent with a longer line - do you think that's possible?

[Dray]

I'd say one issue is the lack of G.INP. Are you connected to a Huawei cab?

[jeffers]

I'd say one issue is the lack of G.INP. Are you connected to a Huawei cab?

No idea. I'll have to take a walk down and snap a picture of it. Unless I can get it out of the modem stats?

[Bald_Eagle1]

Telnet command xdslcmd info --vendor will confirm one way or the other.

The very soon to be released update to HG612 Modem Stats will also display that detail as per the attachment.

[jeffers]

Telnet command xdslcmd info --vendor will confirm one way or the other.

The very soon to be released update to HG612 Modem Stats will also display that detail as per the attachment.

Code: [Select]

# xdslcmd info --vendor
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 23811 Kbps, Downstream rate = 63000 Kbps
Bearer: 0, Upstream rate = 18999 Kbps, Downstream rate = 66237 Kbps

ChipSet Vendor Id: IFTN:0xd086
ChipSet VersionNumber: 0xd086
ChipSet SerialNumber:

I've also just started sending data to mdslstats (same username)

[Dray]

So that's an ECI cab

[jeffers]

So that's an ECI cab

And would explain the ECI modem the BTO guy gave me. There doesnt seem to be any noticeable speed differences between the ECI and the HG612

[burakkucat]

Telnet command xdslcmd info --vendor will confirm one way or the other.

More correctly, that command will disclose the line-card's chipset and that, in turn, allows one to establish the type of DSLAM. 

[WWWombat]

The attenuation looks a bit high for a 250m line. My line is about that length and I have attenuation of around 11db. The stats seem consistent with a longer line - do you think that's possible?

I agree with this.

My last line was about 350-400m, and the HG612 reported attenuation of 16.9dB; your attenuation is slightly higher - so you either have a longer line, or a thinner one, or both.

I've attached the stats from last year, when the cab had been standing for over 3 years. Attainable speeds had dropped around 12Mbps over the 2 years we had that service.

[jeffers]

Thanks for the info. I have followed the poles and measured on google maps - its actually less than 250m, something around 215m. Obviously this doesn't include the additional wiring inside the cabs but it should be fairly accurate, and nowhere near the 400m+ mark expected for this level of attenuation.

Prior to FTTC, I was on ADSL2+ and and did all I could to improve the line performance, including replacing all internal wiring which may or may not have included a new NTE5  . The speeds I was getting were pretty good considering my distance from the exchange. Does anything else affect the attenuation? Dodgy filter from the BTO engineer maybe? Whilst 65Mbit is a huge improvement over my old connection I want to make sure I'm getting the most out of it.

My stats have been uploading to mydslwebstats since last night (user jeffers) if anyone is willing to take a look. I did notice a resync this morning to a slightly higher speed but nothing significant.

All help appreciated!
Jeffers

[ip75]

From looking at your stats, I would guess there is a fault somewhere. You had a large burst of CRC errors at 9:21am which led to a resync, and generally speaking your SNRM is moving around a lot. It is possible, I believe, for an HR type fault to cause an increase in apparent attenuation.

Did anything happen at 9:21 this morning that could have caused the errors? Maybe a phone call?

Could you let us know how your internal wiring is arranged? I don't want to come over all call centre, but does plugging the modem into the test socket on the master help at all?

[jeffers]

From looking at your stats, I would guess there is a fault somewhere. You had a large burst of CRC errors at 9:21am which led to a resync, and generally speaking your SNRM is moving around a lot. It is possible, I believe, for an HR type fault to cause an increase in apparent attenuation.

Did anything happen at 9:21 this morning that could have caused the errors? Maybe a phone call?

Could you let us know how your internal wiring is arranged? I don't want to come over all call centre, but does plugging the modem into the test socket on the master help at all?

I was at work, I just text my wife to see if she used the phone or anything... BUT, I just rang 1471 to see if I had any missed calls. And my connection dropped (about19:05)! The BTO guy fitted a new face thing to my NTE5, I'm guessing thats a glorified filter? Can I just pull it off to get to the master socket?