PEAK TIME SYNC ISSUE

[bobthebuilder]

DOES ANY 1 ELSE NOTICE THERE SYNC GO DOWN DURING PEAK TIME

MINES DSL Up  8000 kbps / 448 kbps  AT MOMENT BET IT GOES DOWN WITHIN THE FIRST HOUR OF PEAK TIME

wat did i say my sync is now DSL Up  7040 kbps / 448 kbps

[Robo]

 Mine is this 24/7 m8   448/8128kbps

[Fastethernet]

Hi Bob,

I wouldn't jump too any conclusions yet, although I am usually the first to start Krapoo bashing 

It could be there is a lose connection on your line. During the evening the copper cools down and contracts which pulls on the lose connection and increases your line attenuation which in turn forces your line profile down.

Do you have any more details about your line statistics? Maybe your line attenuation, signal to noise ratio/margin? What are the types of speed you normally attain, can you max out your line?

[bobthebuilder]

max i can speed is 850k asec round 1meg during peaktime
i am using  zyxel P-660R-D1 

noise margin upstream: 27 db
output power downstream: 19 db
attenuation upstream: 28 db

noise margin downstream: 2 db
output power upstream: 11 db
attenuation downstream: 44 db

[mrX]

max i can speed is 850k asec round 1meg during peaktime
i am using  zyxel P-660R-D1 

noise margin upstream: 27 db
output power downstream: 19 db
attenuation upstream: 28 db

noise margin downstream: 2 db
output power upstream: 11 db
attenuation downstream: 44 db

I think that might be a problem there, might be worth asking karoo to drop the synch rate a bit, I did as my snr was dropping below six and they knocked it down a meg, seemed to be much better after that.

[Fastethernet]

Your noise margin is low, although on these type of ADSL MAX accounts they can run with a low signal to noise margin. Are you losing sync on your line? Have you noticed any corrupted files that you downloaded?

There are a number of factors that cause more noise on lines later in the day so as long as you are getting no errors on the line I wouldn't worry too much.

[bobthebuilder]

was downloading at 850k a sec not notice any corrupt files

DSL Up  7872 kbps / 448 kbps

noise margin upstream: 26 db
output power downstream: 19 db
attenuation upstream: 28 db

noise margin downstream: 6 db
output power upstream: 11 db
attenuation downstream: 44 db

[Ben Atkinson]

Your Downstream is VERY  LOW , You will have disconnections during the evening.

Ask karoo to cap your SNR to 12db and your line will sync at a stable speed all day

[The Dominator]

Would asking KC to replace the physical wires to the house (from the poles) help?  Seeing as you pay for a connection and the main reason the connection is poor could be the poor quality of the wires?

[miken]

Would asking KC to replace the physical wires to the house (from the poles) help?  Seeing as you pay for a connection and the main reason the connection is poor could be the poor quality of the wires?

I want to know that answer awell! our cabling is all 11 years old and im sure its quality is deteriorating, I should be able to get the full sync. Gonan be more apparent when they eventually get the adsl2 service half finished. But I dotn want to be charged £100 for them to replace a few wires.

[Fastethernet]

There is no real issue here, if Bob isn't losing sync and there are no errors a change in the line profile on an evening is no problem. His downloads speeds are high, bully for bob 

To answer the question from the start, Krapoo are not dropping your line speed at peak times to slow you down, their bandwidth throttling machine is quite capable of turning a very quick link into total rubbish without the need to tinker with line speeds.

The vast majority of ADSL lines will have a higher SNR in the morning than in the evening. The hardware used to deliver broadband MAX can handle very low SNR, I mean extremely low, think more like 6 SNR as the default and lines running well with an SNR of 3. Its one of the great features of this type of connection and if the line isn't generating errors or dropping the link then a low SNR is no problem at all.

I would have though Krapoo would run you another line from the pole/street if you wanted to pay the installation fees, i think it's £50. However if you are too far from the exchange a new line won't change that. Krapoo do offer a 'low loss line' which they guarantee the db loss on, maybe that might be an way of improving on a poor line.

[miken]

Well we do periodically lose sync.

Heres the line stats.

adsl: ADSL driver and PHY status
Status: Showtime  Channel: INTR, Upstream rate = 448 Kbps, Downstream rate = 6688 Kbps
Link Power State: L0
Mode:                   G.DMT
Channel:                Interleave
Trellis:                OFF
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):       12.6            14.0
Attn(dB):       24.0            18.5
Pwr(dBm):       19.8            6.8
Max(Kbps):      7872            668
Rate (Kbps):    6688            448
                        G.dmt framing
K:              210(0)          15
R:              16              16
S:              1               8
D:              1               1
                        ADSL2 framing
MSGc:           1               1
B:              210             15
M:              1               8
T:              1               1
R:              16              16
S:              1.0758          9.0000
L:              1688            128
D:              1               1
                        Counters
SF:             4107933         4107931
SFErr:          228             0
RS:             279339506               34917413
RSCorr:         526             10
RSUnCorr:       367             0

HEC:            189             0
OCD:            0               0
LCD:            0               0
Total Cells:    1101546236              0
Data Cells:     102271375               0
Drop Cells:     0
Bit Errors:     0               0

ES:             164             0
SES:            0               0
UAS:            24              0
Total time = 19 hours 24 min 42 sec
SF  = 4107933
CRC = 228
LOS = 0
LOF = 0
ES  = 164
Latest 1 day time = 19 hours 24 min 42 sec
SF  = 4107933
CRC = 228
LOS = 0
LOF = 0
ES  = 164
Latest 15 minutes time = 9 min 42 sec
SF  = 34220
CRC = 2
LOS = 0
LOF = 0
ES  = 2
Previous 15 minutes time = 15 min 0 sec
SF  = 52923
CRC = 3
LOS = 0
LOF = 0
ES  = 3
Previous 1 day time = 0 sec
SF  = 0
CRC = 0
LOS = 0
LOF = 0
ES  = 0
15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
SF  = 52923
CRC = 4
LOS = 0
LOF = 0
ES  = 4
15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
SF  = 52982
CRC = 1
LOS = 0
LOF = 0
ES  = 1
15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
SF  = 52923
CRC = 7                                                                         

Are those last 20 hours crc errors high? I can't seem to work out if anything on our end causes the loss of sync. It sometimes just hanges and I have to go manually tell it to resync via ssh.

Thanks

Mike

[Fastethernet]

Hi Mike,

Most of your stats look good, low attenuation and high SNR, although you do have CRC errors they are not a massive amount. The loss of sync does seem odd given your stats, do you use microfilters? Do you have a low noise filter build into your phone socket? What type of router do you have?

[miken]

2x Microfilters,

We dont use the master but it has 2 extensions off it one goes upstairs and one next to pc.

Upstairs only has Microfilters + Sky
Downstairs has Microfilters + fax + Sky + Cordless Phone

I don't know what a low noise filter is.

We are 1km (straight line) away from the exchange.

Using a Belkin F5D9630

[Fastethernet]

Hi Mike,

A low noise filter is just a micro filter built into the phone socket. Looks like you have quite a large amount of kit using your phone line; I suspect something within your home might be causing your disconnections as your line stats are very good. Sky boxes have been blamed many a time, I'm not suggesting that’s the case here but it’s worth bearing in mind.

Can you use one micro filter at the master socket instead of two elsewhere in the house? Ideally you want to strip out the high frequency part of your line early to avoid introducing interference along cable runs within your property. If possible run a high quality cable from your router to the master socket.