What does 'Loss of signal' mean?

Hope this is the right place.

Perhaps I am being thick, but what does 'Loss of signal' mean? Over my years on BB I have always thought it meant the no. of resyncs, as 'uptime' on some routers stats often means time router powered on. When I have a resync at the time i am actually on the PC, the 'uptime' resets but errors etc never reset, so always took LOS to be 'resync'.

However last week and last two days I have had 'Loss of signal' (local). Had 20 LOS in last 24hrs (mon-tues eve) and 8 Friday -28 total -. Son was at home Monday streaming films and iplayer and never had any buffering (unless when he went to loo, LOL). Spoke to O2 tech who said it could mean loss of 'internet' not DSL, and they said no loss of sync in last 24 hrs (mon-tues eve), confirming sync time at 6 days +. Or could it be a router glitch. Been keeping an eye on things before I may jump ship to PlusNet. Stats as of 18.55 last night.: Just rang son no LOS today so far.

Uptime: 6 days, 2:30:35
DSL Type: G.992.1 annex A
Channel mode: Interleave
Maximum Bandwidth (Up/Down) [kbps/kbps]: 1,150 / 6,126
Bandwidth (Up/Down) [kbps/kbps]: 969 / 5,607
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.0 / 19.0
Line Attenuation (Up/Down) [dB]: 31.5 / 55.0
SN Margin (Up/Down) [dB]: 6.0 / 5.0
Vendor ID (Local/Remote): TMMB / BDCM
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 28 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 118 / 0
FEC Errors (Up/Down): 2,365 / 1,664,721,575
CRC Errors (Up/Down): 2,365 / 11,226
HEC Errors (Up/Down): 844 / 9,609

You may find this http://www.kitz.co.uk/adsl/linestats_errors.htm interesting - scroll down to LOS.

Brill, thanks, nowt to be concerned about, learnt something new, got my other son worried as he's had 320,000+ in 6mths, he's on PN with no 'profile' issues.

Plusnet may connect to G.992.5 annex A, if your exchange is enabled, and you should get a slightly faster downstream sync. However your line looks OK on G.992.1 annex A given an attenuation of 55dB

In reply to a post by 4M2:

Plusnet may connect to G.992.5 annex A, if your exchange is enabled, and you should get a slightly faster downstream sync. However your line looks OK on G.992.1 annex A given an attenuation of 55dB

Yes 21CN, was 992.5 on O2 used to get 6100ish atten 58, but O2 changed it 2yrs ago after a fault. Not worried if PN put me 992.1.

Does seem that your line is probably more stable on G.992.1 annex A...guess you will just have to wait a see what happens if you switch to Plusnet and perhaps ADSL2+ initially. However your downstream sync speeds are very good on those 55dB and 58dB attenuations

In reply to a post by 4M2:

.....see what happens if you switch to Plusnet and perhaps ADSL2+ initially. However your downstream sync speeds are very good on those 55dB and 58dB attenuations

One of the PN DCT on here said they could provision on ADSL1.

Its all underground, the penalty is if you get a fault with estimate of 2meg. Had a fault with the actual test socket box 2 yrs ago that caused 100+ resyncs per day, 2wks after BTOR replaced it and went back to normal, O2 put me on ADSL1 to stabilise!!!!!. Longest sync was 63 days on ADSL2+. but heh ho i'm happy with what I get. FWIW 2wks ago it did sync at 6022 for two days on ADSL1 !!!! When I noticed SNM was at 8 thought I'd reboot.

I wouldn't do that - get the full service and select the modulation type on your router - then you have control and can see which is best.

In reply to a post by yarwell:

I wouldn't do that - get the full service and select the modulation type on your router - then you have control and can see which is best.

I have the o2 boxII, 585v7, which seems much locked down, my own 585v6 used to work but O2 made changes to network in Feb and since then it won't connect to 'Internet', only DSL, despite following Oliver341's O2 help site for flashing the firmaware, which he's now closed from today. Never mind my 585 will do as a backup as and when I move.

With the 585 v6 it should be fairly straight forward to telnet a change to the modulation type using Windows Command Prompt if the firmware is V6.2.G or later.

In reply to a post by 4M2:

With the 585 v6 it should be fairly straight forward to telnet a change to the modulation type using Windows Command Prompt if the firmware is V6.2.G or later.

Yes can do, also with DMT tool as well, put SNR down to 3 and synced at 6203! Didn't last but still could not get 'Internet' though.. I am not worried will wait till I switch ISP before messing around anymore.

Think I found out what happened, on Mon 22 BT put a new pole up right next to cab, been told that cab was open most of day with two guys doing cabling, that probably caused the noise. Been OK last 6 days. Why a new pole I don't know, cab has only has few lines used out of the 100 in there, and everyone is UG.

Probably connecting somebody who didn't have a UG line & this was the easiest way?
Or somebody required extra lines. Say if they needed 4 lines, the one existing underground cable wouldn't be enough so BT would install another line or two. It's less costly to do it overhead than to dig up the roads. Could also be that the underground line needed replacing and again this seemed the most sensible route.

You only want to be concerned with connection uptime really. If that drops to 00:00:00 then the routers either been rebooted or the sync lost.

On a true resync all my stats reset to zero but I only see fec crc and hec errors.

Edited by ukhardy07 (Tue 06-Aug-13 15:35:15)

In reply to a post by ukhardy07:

It's less costly to do it overhead than to dig up the roads. Could also be that the underground line needed replacing and again this seemed the most sensible route.

On a true resync all my stats reset to zero but I only see fec crc and hec errors.

Spot on saw BTOR BB neighbour, two more poles gone up 5 houses lost phone and or BB coiple of weeks, fault from cab, megabucks to dig up road. Heh ho they've all got new copper after 42yrs, albeit above ground, bet they getter better sync, heehee. Thought it strange as theres actually only 45 lines used out of the 100 in cab.

Router resets all as well, just never seen LOS before, makes a mockery of O2 techs in my post in 'O2' section, re O2 techs saying LOS will go if I change to Sky.

Yeah changing to sky would make no difference whatsoever. If you don't want their line rental you can wait it out and eventually you should migrate to sky line rental free or move on.
Sadly sky support seen to have been given orders to get absolutely everyone from O2 onto a sky package. I feel like there's possibly an incentive for the staff if they transfer you over. If that's the case it explains why sky are often lying to get customers over.

I think it's largely as they want everyone on the new llu equipment. Frustrating though!!

Edited by ukhardy07 (Tue 06-Aug-13 23:08:45)