Reducing CRC errors

tang0 · 19 Dec 2006 at 17:21

52000 errors in 1 day uptime ? :O

How do i reduce the errors?

# adslctl info --stats
adslctl: ADSL driver and PHY status
Status: Showtime Channel: INTR, Upstream rate = 832 Kbps, Downstream rate = 7616 Kbps
Link Power State: L0
Mode: G.DMT
Channel: Interleave
Trellis: OFF
Line Status: No Defect
Training Status: Showtime

Down Up
SNR (dB): 5.9 11.0
Attn(dB): 36.0 22.0
Pwr(dBm): 19.8 11.9
Max(Kbps): 8256 1120
Rate (Kbps): 7616 832

G.dmt framing
K: 239(0) 27
R: 16 16
S: 1 8
D: 16 2

ADSL2 framing
MSGc: 1 1
B: 239 27
M: 1 8
T: 1 1
R: 16 16
S: 1.0666 8.5714
L: 1920 224
D: 16 2

Counters
SF: 29258414 29258412
SFErr: 3134 58
RS: 1989572220 248696502
RSCorr: 1912610815 282
RSUnCorr: 11599 0

HEC: 2767 44
OCD: 9 0
LCD: 0 0
Total Cells: 344362844 0
Data Cells: 129136854 0
Drop Cells: 0
Bit Errors: 0 0

ES: 7135 0
SES: 864 0
UAS: 25 0
Total time = 1 days 30 min 50 sec
SF = 40765196
CRC = 52136
LOS = 94
LOF = 0
ES = 7135
Latest 1 day time = 30 min 50 sec
SF = 108860
CRC = 0
LOS = 0
LOF = 0
ES = 0
Latest 15 minutes time = 50 sec
SF = 2999
CRC = 0
LOS = 0
LOF = 0
ES = 0
Previous 15 minutes time = 15 min 0 sec
SF = 52930
CRC = 0
LOS = 0
LOF = 0
ES = 0
Previous 1 day time = 24 hours 0 sec
SF = 5082321
CRC = 1388
LOS = 17
LOF = 0
ES = 421
15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
SF = 52931
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
SF = 52930
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
SF = 52931
CRC = 1
LOS = 0
LOF = 0
ES = 1
#
#

Curiosityx · 19 Dec 2006 at 17:25

CRC errros indicate a fault on your line, get in touch with BT and report the findings, theres nothing you can do at your end.

tang0 · 19 Dec 2006 at 17:38

Just some pics i took of my house wiring

Where line comes in downstairs (black box), then into the white box

Inside gubbins

Inside black box

tang0 · 19 Dec 2006 at 17:39

Upstairs adsl from downstairs

Inside ADSL faceplate

Diagram

WOMBATWILSON · 19 Dec 2006 at 17:40

think i been here before looking at those photos

tang0 · 19 Dec 2006 at 17:42

Yep, but i didn't get a lot of help really, i emailed isp they didn't say a lot

Curiosityx · 19 Dec 2006 at 17:43

Umm wow, well im no BT engineer but the wiring looks somewhat untidy, try a line test first and go from there, if needs be youll need an engineer.

WOMBATWILSON · 19 Dec 2006 at 17:46

tang0 said:
Yep, but i didn't get a lot of help really, i emailed isp they didn't say a lot

thought id already had told you that looking at the those photos the line comes in upstairs at the main socket with the nte 2000 and goes downstairs to the other sockets

tang0 · 19 Dec 2006 at 17:52

WOMBATWILSON said:
thought id already had told you that looking at the those photos the line comes in upstairs at the main socket with the nte 2000 and goes downstairs to the other sockets

Yeh whats the best way to bypass all other wires so i can just plug in adsl straight to the incoming line?

WOMBATWILSON · 19 Dec 2006 at 17:55

tang0 said:
Yeh whats the best way to bypass all other wires so i can just plug in adsl straight to the incoming line?

you need to take some photos from outside so i can say where the line definatly comes in. but im almost sure it comes in upstairs and then goes down so the adsl filter should be doing its job and nothing needs disconnecting

tang0 · 19 Dec 2006 at 18:00

WOMBATWILSON said:
you need to take some photos from outside so i can say where the line definatly comes in. but im almost sure it comes in upstairs and then goes down so the adsl filter should be doing its job and nothing needs disconnecting

Right this is what i think, the line comes in, goes to the black box, then goes to the bt box, then routes upstairs next to faceplate pc i think this is the master socket, and all other lines in the house are filtered off this.

WOMBATWILSON · 19 Dec 2006 at 18:04

so when you disconnect the faceplate upstairs do all of the extns go off?

tang0 · 19 Dec 2006 at 18:04

WOMBATWILSON said:
so when you disconnect the faceplate upstairs do all of the extns go off?

hmm not sure i'll have to try

tang0 · 19 Dec 2006 at 18:16

WOMBATWILSON · 19 Dec 2006 at 18:19

so it looks like it does come in downstairs and then goes up but then comes back down again on the green/black wires. has the line been noisy at all?

tolien · 19 Dec 2006 at 18:21

Curiosityx said:
CRC errros indicate a fault on your line

Only if they're service effecting (ie low throughput and/or packet loss). 9 times out of ten they're completely irrelevant.

7135 errored seconds in just over a day is roughly 8% of the time, and 52000 CRC errors in 344362844 cells is less than 0.02%. Unless you're seeing any kind of problem (and it's more likely that the cause of any problem isn't going to be the errors), ignore them.

Locky · 19 Dec 2006 at 22:49

Find the pair that comes into your house.

Most likely a white/orange or black/green

Get your NTE5 socket

Connect this pair directly to your NTE5, use the A & B connecters

Now plug your router directly into the master socket and test

Then start adding extensions and test as you go along

tolien · 19 Dec 2006 at 23:28

TiZoR said:
I don’t think this is competitor

It is.

Locky · 20 Dec 2006 at 11:56

just wanted to know the nature of it being a *competitor*

all i can see if the doctor who leather jacket

ADSL installion kits like nte5 etc

Edit, it says it sells routers/modems

but infact when u click it, it doesnt :confused:

never less if you deem it a competitor so be it