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deleted
(deleted) Fri 20-Jan-12 00:03:05

Re: Xilo and Be LLU

[re: adslmax] [link to this post]

In reply to a post by adslmax:
.... BT Engineerring told me!

That's called False Authority Syndrome

adslmax
(fountain of knowledge) Fri 20-Jan-12 00:04:51

Re: Xilo and Be LLU

[re: uno] [link to this post]

Ah ok Matt. I think my line is more errors but I just ingorne it. Cos I want the fastest highest speed of 15 Meg. Due to BT profile limit 15000K but why can't BT set 17000K profile to match sync rate ?

plusnetADSL2+15 Meg

Edited by adslmax (Fri 20-Jan-12 00:05:53)

XRaySpeX
(eat-sleep-adslguide) Fri 20-Jan-12 00:09:54

Re: Xilo and Be LLU -EDITED

[re: adslmax] [link to this post]

EDIT: Since deleted:

In reply to a post by adslmax:
System Up Time 01:09:31

You have extremely high ES, CRC and HEC for 1h 10m!

Has it re-synced w/out doing a reboot? Some routers reset the Uptime but do not zeroise the error counts at the same time making it difficult to analyse them.

1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC

Edited by XRaySpeX (Fri 20-Jan-12 00:14:36)

adslmax
(fountain of knowledge) Fri 20-Jan-12 00:18:33

Re: Xilo and Be LLU -EDITED

[re: XRaySpeX] [link to this post]

I just ingorne the errors ! It won't harm my broadband line! It use to be under 25 CRC in an hour before but I think my local exchange had a major uplift shift ! Use to be line attenuation of 34dB before but now reduce to 32.5dB.

plusnetADSL2+15 Meg

Edited by adslmax (Fri 20-Jan-12 00:21:03)

XRaySpeX
(eat-sleep-adslguide) Fri 20-Jan-12 00:35:32

Re: Xilo and Be LLU

[re: adslmax] [link to this post]

Then it is quite likely that your assertion is true: On a line highly susceptible to errors, like yours, you get more CRC errors at 3 dB NM than at higher NMs.

But that is not generalisable to more normal lines, like mine, as 3 of us have confirmed grin

1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC

RobertoS
(sensei) Fri 20-Jan-12 01:06:01

Re: Xilo and Be LLU

[re: adslmax] [link to this post]

In reply to a post by adslmax:
Ah ok Matt. I think my line is more errors but I just ingorne it. Cos I want the fastest highest speed of 15 Meg. Due to BT profile limit 15000K but why can't BT set 17000K profile to match sync rate ?

Your stats look as though nearly every SuperFrame (37401) has at least one uncorrected error. Given the Error Seconds and Severe Error Seconds you had a lot more than 37401 error packets within those SuperFrames.

Each errored packet has to be transmitted again. That means your real data speed goes down.

If you were using Interleaved instead of Fast Path, most of the errors would be corrected and not need retransmitting. Your real data speed would be higher.

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - IDNet Home Starter Fibre. Live BQM.

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.

adslmax
(fountain of knowledge) Fri 20-Jan-12 04:51:31

Re: Xilo and Be LLU

[re: RobertoS] [link to this post]

I don't like interleaved on because it getting high ping in gaming! Fast path reduced ping!

plusnetADSL2+15 Meg

RobertoS
(sensei) Fri 20-Jan-12 10:01:46

Re: Xilo and Be LLU

[re: adslmax] [link to this post]

In reply to a post by adslmax:
I don't like interleaved on because it getting high ping in gaming! Fast path reduced ping!

Logic fail by you!

If you are getting that rate of error packets then a fair number of them will be gaming-related. Each will require retransmission. That knackers your gaming. The actual gaming latency will be highly variable, rather than what a short ping test may show. Have you tried a 50-packet ping test?

All comments I have seen here from avid gamers has been that connection speed is far less important, once you get to these levels, than predictably steady latency. Your connection speed only exists only for a few kilometres to the exchange. Your underlying latency also depends on the hundreds or thousands of mile to the gaming server; the efficiency of every router it goes through; and the performance of the gaming server.

Interleaving at your end would almost certainly be better for your gaming. Possibly even better would be a noise margin of 6dB or 9dB to eliminate the vast majority of errors in the first place, as that way Fast Path may actually be of benefit to you rather than mess you up.

aquilla
(knowledge is power) Mon 23-Jan-12 17:35:24

Re: Xilo and Be LLU

[re: adslmax] [link to this post]

Since my last post, I appear to have found a suitable combination of IOS & Firmware patch for the Cisco 877W that will allow it to operate at ADSL2+ without issues on Xilo's Be 16 package.

The connection has been running fine for about 6 days now. The logs show the connection has dropped 5 times in that period (although 2 of those were me when I moving some stuff around).

Using an IOS command I've tweaked the SNR down to around 3.0dB and it appears to be happily sitting at about 10.5Mbps / 1.1Mbps sync. Speedtests are showing about 9Mbps throughput downstream and 1Mbps upstream.

As for errors, the Cisco is recording errors but I think there might be a bug sorry feature which causes the error count to read incorrectly (e.g. the FEC ES Errors on the Upstream which is an enormous figure the moment I connect, and the Reed-Solomon EC on the upstream).

Q: Can anyone offer any insight into why I am only getting 10Mbps on a line with 34.0dB attenuation? At the moment I'm connected to the upstairs extension but I get the same reading (and same sync speed) in the test socket. Tried different filters and routers but get the same. If that's the way it is then fine.

Text

rtr-01>show ver | i uptime
rtr-01 uptime is 5 days, 20 hours, 58 minutes 
rtr-01>show dsl int atm 0ATM0
Alcatel 20190 chipset information                ATU-R (DS)                      ATU-C (US)
Modem Status:    Showtime (DMTDSL_SHOWTIME)DSL Mode:        ITU G.992.5 (ADSL2+) Annex A
ITU STD NUM:     0x03                            0x2Chip Vendor ID:  'STMI'                          'BDCM'
Chip Vendor Specific:  0x0000                    0xA1E9Chip Vendor Country:   0x0F                      0xB5
Modem Vendor ID: 'CSCO'                          'BDCM'Modem Vendor Specific: 0x0000                    0x0000
Modem Vendor Country:  0xB5                      0xB5Serial Number Near:    FCZxxxxxxZ 877W-G-E 15.0
Serial Number Far:  Chip ID:     C196 (0)DFE BOM:         DFE3.0 Annex A (1)
Capacity Used:   96%                             99%Noise Margin:     2.0 dB                          5.5 dB
Output Power:    19.0 dBm                        12.5 dBmAttenuation:     34.0 dB                         16.0 dB
FEC ES Errors:    0                              85287ES Errors:       891                             301
SES Errors:      192                             10LOSES Errors:     0                               1
UES Errors:      13822                            0Defect Status:                       LOM     None
Last Fail Code:  NoneWatchdog Counter: 0x05
Watchdog Resets: 0Selftest Result: 0x00
Subfunction:     0x00Interrupts:      226914 (0 spurious)
PHY Access Err:  0Activations:     5
LED Status:      ONLED On Time:     100
LED Off Time:    100Init FW:         init_AMR_4.0.223.bin
Operation FW:    AMR-E-4.0.223.binFW Source:       external
FW Version:      4.0.223 
                 DS Channel1      DS Channel0   US Channel1       US Channel0Speed (kbps):             0            10615             0              1188
Cells:                    0        674143975             0         239263002Reed-Solomon EC:          0                0             0         595655620
CRC Errors:               0              925             0               678Header Errors:            0              912             0             29293

Regards,

Stuart

Current ISP: Xilo LLU (via Cable & Wireless)
Previous ISP: Zen (for 9 years).

RobertoS
(sensei) Mon 23-Jan-12 17:44:21

Re: Xilo and Be LLU

[re: aquilla] [link to this post]

Can anyone offer any insight into why I am only getting 10Mbps on a line with 34.0dB attenuation?

Similar with the Netgear it seems, so not the router. I'd expect 13Mbps+ on a 6dB margin.

You do mean the test socket inside the master? Not the normal external socket.

Are you using any phone extension cables to reach the sockets, and have you tried different filters?

If you remove the master faceplate, do all extensions stop working?

Have you got a phone-connected burglar alarm?

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