Post your FTTC line stats & unlocking info

It's been about a month since the switch over to fttc, the line length is roughly 200m by road.

I've now changed the modem back to the supplied ECI modem, I'll keep the HG one just as a backup, I was just very curious as to the state of the line and if it would be worth the upgrade to the 80/20 pro.
 
Just received my HG612 to replace the ECI. Not sure what I should be looking for in my stats...

Reason i got the HG612 was to check the line stats and see why i started with 76mbps and now i have 56mbps with slower latency.

The mac telnet is different to the windows one in its format.

Code: 
# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:	0
Max:	Upstream rate = 19799 Kbps, Downstream rate = 71724 Kbps
Path:	0, Upstream rate = 19820 Kbps, Downstream rate = 61300 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (880,1195) (1984,2771) 
DS: (32,859) (1216,1959) (2792,4083) 
Medley Phase (Final) Band Plan
US: (0,95) (880,1195) (1984,2771) 
DS: (32,859) (1216,1959) (2792,4083) 
       VDSL Port Details       Upstream        Downstream
Attainable Net Data Rate:      19799 kbps         71724 kbps
Actual Aggregate Tx Power:        6.9 dBm          13.4 dBm
============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):	 0.7	 23.2	 35.7	  N/A	 12.4	 29.6	 46.7	
Signal Attenuation(dB):	 0.7	 23.0	 35.6	  N/A	 12.4	 29.6	 46.7	
        SNR Margin(dB):	 6.0	 6.0	 6.0	  N/A	 6.1	 6.1	 6.2	
         TX Power(dBm):	-3.6	-19.6	 6.4	  N/A	 10.8	 7.4	 6.2

Code: 
# xdslcmd info --show
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:	0
Max:	Upstream rate = 19833 Kbps, Downstream rate = 71724 Kbps
Path:	0, Upstream rate = 19820 Kbps, Downstream rate = 61300 Kbps

Link Power State:	L0
Mode:			VDSL2 Annex B
VDSL2 Profile:		Profile 17a
TPS-TC:			PTM Mode
Trellis:		U:ON /D:ON
Line Status:		No Defect
Training Status:	Showtime
		Down		Up
SNR (dB):	 6.1		 6.0
Attn(dB):	 0.0		 0.0
Pwr(dBm):	 13.3		 6.9
			VDSL2 framing
			Path 0
B:		63		238
M:		1		1
T:		64		64
R:		16		16
S:		0.0332		0.3839
L:		19264		5314
D:		971		1
I:		80		255
N:		80		255
			Counters
			Path 0
OHF:		615892		160757
OHFErr:		0		1
RS:		118251041		1695181
RSCorr:		5474		3
RSUnCorr:	0		0

			Path 0
HEC:		0		0
OCD:		0		0
LCD:		0		0
Total Cells:	116172734		0
Data Cells:	123610		0
Drop Cells:	0
Bit Errors:	0		0

ES:		0		1
SES:		0		0
UAS:		22		22
AS:		988

			Path 0
INP:		3.00		0.00
PER:		1.59		6.14
delay:		8.00		0.00
OR:		105.35		24.74

Bitswap:	292		4

I think the engineer was saying my cab is 400m away and the exchange another 600m from the cab.

What other tweaks are good besides QoS?
 
Last edited:
Your connection will have started off on a wide open profile on fastpath (Interleaving OFF).

DLM must have seen quite a few errors, so has now applied Interleavinbg at a depth of 971 downstream (which is fairly high) & is still OFF for upstream (depth of 1).
D: 971 1

This, combined with SNRM of around the target 6dB suggests that your connection is probably a bit noisy (possibly crosstalk from other connections), is affected by electrical interference or there is a fault somewhere in the cabling or joints.


Impulse Noise Protection is now ON at a value of 3.00 downstream & OFF for upstream:-
INP: 3.00 0.00

Delay is now at 8.00 downstram & OFF for upstream.
delay: 8.00 0.00

A sync speed of 61300 Kbps looks fairly typical for a 400m line.
Some users see sustained higher speeds, but some see lower speeds for similar line lengths.

For VDSL2/FTTC connections, the distance from cabinet to the exchange is no longer relevant.


There really aren't any other tweaks available to users and ISPs as everything is basically controlled by DLM.

It is thought that ECI modems perform somewhat 'better' than HG612 modems when connected to an ECI DSLAM as you are:-
Discovery Phase (Initial) Band Plan
US: (0,95) (880,1195) (1984,2771)
DS: (32,859) (1216,1959) (2792,4083)

We won't know for sure until detailed stats can be reliably obtained from ECI modems & compared like for like against the stats available from a HG612 modem.

I don't suppose you have any stats from when your connection speed was higher, do you?
 
Thanks for the info! Annoying that the DLM has seen quite a few errors. I've always had a really rock solid connection prior to having fibre and my latency has doubled since also.

Is there nothing i can do to stop interleaving?

The connection next door has faster latency and speeds than me which i find a bit annoying. Might go next door and get some stats there tomorrow.

I shall see what the connection is like for the next few weeks and then maybe go back to the ECI. I have no stats from when my connection was higher as I wasn't sure it was possible on the ECI modem.
 
Logsi said:
Thanks for the info! Annoying that the DLM has seen quite a few errors. I've always had a really rock solid connection prior to having fibre and my latency has doubled since also.

Is there nothing i can do to stop interleaving?
Click to expand...

Not really as it's totally controlled by what DLM thinks of your connection's quality.

Supposedly, 3 profile types are available; stable, normal & fast.
I'm not aware that any ISPs have actually implemented those options via BT at this stage though.

The connection next door has faster latency and speeds than me which i find a bit annoying. Might go next door and get some stats there tomorrow.

I shall see what the connection is like for the next few weeks and then maybe go back to the ECI. I have no stats from when my connection was higher as I wasn't sure it was possible on the ECI modem.
Click to expand...

I suppose you could try connecting by removing the filtered faceplate & connecting a dangly ADSL filter directly to the test socket for a few days, just to temporarily rule out any other potential internal telephone wiring or defective faceplate filter issues.
 
Some great info here. Infinity was installed yesterday, as soon as the engineer left I swapped the BT Hub for an Asus RTN66U (tomato of course), and now want to load the unlocked HG612 firmware onto the modem. Everything is ready, firmware downloaded, but one a quick question.

What's the right way to turn the locked 612 off without it triggering a disconnection error? Our line is 850m from the CAB, (though all underground on good quality copper), and I don't want DLM to be given any excuses to think its been disconnected because of an error and needs 'stabilizing'.

Once the modem is unlocked I'll contribute the stats.
 
Logsi - My stats are very similar to yours except I'm still on Fastpath. I too did have the full 77mbit for a few days, then DLM kicked in and set me down to 60mbit.
You could look at the option to do a soft reboot of the modem when you notice the SNR a bit higher/Sat or Sunday is usually the best day. I did it and so far i'm at 67mbit sync but only 64mbit attainable (current SNR 5.4)
 
Da[]San;23941263 said:
Once you have uploaded the unlocked firmware you go to maintenance/device/reboot
Click to expand...
How to do it before flashing the unlocked software? Rather than just turn off any other way to do it?
 
Da[]San;23941768 said:
If you are not using the unlocked software you can reboot it using the Homehub.
Click to expand...

I'm not using the Homehub, I want to take the modem offline so I can flash it, and I was hoping I could take it offline without it looking like a disconnection error. Looks like it might not be possible.
 
ezhik said:
I want to take the modem offline so I can flash it, and I was hoping I could take it offline without it looking like a disconnection error. Looks like it might not be possible.
Click to expand...

Just unplug the cable from the master socket & then unplug the power supply.

As long as it's off for a few minutes with no attempt to reconnect, DLM should see it as an intentional disconnection rather than a faulty line connection.

Do the unlocking & check that you can access the modem's GUI etc. before plugging it back into the master socket.

You will then have had just the one disconnection, interpreted as intentional.
 
Unplug the modem and flash it just before you are going to be doing something for a couple of hours. DLM only interprets rapid disconnect/reconnects as instability, so I've been told anyway.

I did mine just before going to the pub one evening. When I came back about 3 hours later, I fired it up and re-synced without degrading the profile :cool:

Edit: Too slow ^^
 
Thank you both for the answer.

DLM crippled ADSL until I went to Be LLU and had it disabled, makes me nervous being back on a BT controlled line again and with DLM and still have a lengthy line to the CAB. I can see what speed there is disappearing if careless.
 
Here are the stats just after the line came back up after unlocking.

Code: 
Welcome Visiting Huawei  Home Gateway
Copyright by Huawei Technologies Co., Ltd.
Login:admin
Password:
ATP>sh


BusyBox v1.9.1 (2010-10-15 17:59:06 CST) built-in shell (ash)
Enter 'help' for a list of built-in commands.

# ls
var      tmp      proc     linuxrc  etc      bin
usr      sbin     mnt      lib      dev      BTAgent
# cat /proc/version
Linux version 2.6.21.5 ([email protected]) (gcc version 4.2.3) #3
Fri Oct 15 17:57:45 CST 2010
# cat /proc/cpuinfo
system type             : CHIP96368
processor               : 0
cpu model               : BCM6368 V3.1
BogoMIPS                : 398.95
wait instruction        : no
microsecond timers      : yes
tlb_entries             : 32
extra interrupt vector  : no
hardware watchpoint     : no
ASEs implemented        :
VCED exceptions         : not available
VCEI exceptions         : not available

unaligned exceptions            : 305645
# xdslcmd --show
xdslcmd: invalid command
# xdslcmd info --show
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max:    Upstream rate = 6651 Kbps, Downstream rate = 32120 Kbps
Path:   0, Upstream rate = 6678 Kbps, Downstream rate = 31768 Kbps

Link Power State:       L0
Mode:                   VDSL2 Annex B
VDSL2 Profile:          Profile 17a
TPS-TC:                 PTM Mode
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        6.2             6.1
Attn(dB):        0.0             0.0
Pwr(dBm):        11.4            2.6
                        VDSL2 framing
                        Path 0
B:              239             207
M:              1               1
T:              64              39
R:              0               4
S:              0.2404          0.9889
L:              7986            1715
D:              1               1
I:              240             106
N:              240             212
                        Counters
                        Path 0
OHF:            109794          43885
OHFErr:         13              0
RS:             0               1710955
RSCorr:         0               0
RSUnCorr:       0               0

                        Path 0
HEC:            62              0
OCD:            0               0
LCD:            0               0
Total Cells:    25813586                0
Data Cells:     789616          0
Drop Cells:     0
Bit Errors:     0               0

ES:             8               0
SES:            0               0
UAS:            485             485
AS:             425

                        Path 0
INP:            0.00            0.00
PER:            3.84            9.64
delay:          0.00            0.00
OR:             51.99           26.55

Bitswap:        78              25

#

Am I right in thinking so far still on fast path. Its quite a long line at 850m (according to the OR installation engineer), so fingers crossed DLM (or FLM as I like to call it), doesn't cripple it too much as time goes on.

Thanks for all the info in this thread to get this unlocked.
 
Thanks for that. It was installed yesterday, just 24 hours ago.

Some more stats

Code: 
# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max:    Upstream rate = 6627 Kbps, Downstream rate = 31440 Kbps
Path:   0, Upstream rate = 6678 Kbps, Downstream rate = 31768 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3959)
Medley Phase (Final) Band Plan
US: (0,95) (868,1207)
DS: (32,859) (1216,1963)
       VDSL Port Details       Upstream        Downstream
Attainable Net Data Rate:       6627 kbps         31440 kbps
Actual Aggregate Tx Power:        2.6 dBm          11.4 dBm
============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):  8.7     45.2     N/A     N/A    20.3    55.4    0.1

Signal Attenuation(dB):  8.7     44.8     N/A     N/A    20.3    55.4     N/A

        SNR Margin(dB):  5.9     6.1      N/A     N/A    5.8     5.8      N/A

         TX Power(dBm): -8.7     2.3      N/A     N/A    9.3     7.2      N/A

Its early days, so all that can be done is....well not much is there, apart from keep the modem powered on.
 
ezhik said:
Here are the stats just after the line came back up
Am I right in thinking so far still on fast path. Its quite a long line at 850m (according to the OR installation engineer), so fingers crossed DLM (or FLM as I like to call it), doesn't cripple it too much as time goes on.

Thanks for all the info in this thread to get this unlocked.
Click to expand...

Yes, it's on fastpath (at the moment).

On an 850m line length (possibly longer when considering how it may be routed), there's every likelyhood that interleaving, Impulse Noise Protection & delay will be switched on over the next few days.

I have a similar length line & when DLM has been reset (following physical line repairs) the connection has initially synced at around 35Mb until Interleaving etc. has been applied via DLM.
Currently, my sync speed is around 26Mb.

Useful detail can be obtained via xdslcmd info pbParams (note the upper case 'P').

That will show the band plans that your connection is able to use, attenuation per band, SNRM per band etc.

It will also show which type of DSLAM you are connected to - Huawei or ECI.

If you are a Windows user, you could try out the connection logging/graphing programs, downloadable from here just to keep a record of how the connection stats change over time.

These programs use xdslcmd info --stats & xdslcmd info -pbParams data (plus bitloading data etc.) to generate graphs to 'see' what the connection looks like.

If not now, crosstalk will more than likely lower your connection speeds over time as more users are connected (hence my current 26Mb from an original 35Mb sync speed).

If serious errors are not seen, DLM will probably make its adjustments to provide a stable connection around 2 days or so after installation, otherwise it will kick in straight away.

Hopefully, you have a good quality all copper connection & DLM adjustments won't be too severe for you.
 
Last edited:
ezhik said:
Thanks for that. It was installed yesterday, just 24 hours ago.

Some more stats

Its early days, so all that can be done is....well not much is there, apart from keep the modem powered on.
Click to expand...

Ah, you posted whilst I was still typing.

These are my pbParams stats for comparison:-

Code: 
xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:	2
Max:	Upstream rate = 5804 Kbps, Downstream rate = 30968 Kbps
Path:	0, Upstream rate = 5682 Kbps, Downstream rate = 25721 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783) 
DS: (32,859) (1216,1963) (2792,3959) 
Medley Phase (Final) Band Plan
US: (0,95) (868,1207) 
DS: (32,859) (1216,1963) 
       VDSL Port Details       Upstream        Downstream
Attainable Net Data Rate:       5804 kbps         30968 kbps
Actual Aggregate Tx Power:        6.3 dBm          12.5 dBm
============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):	 8.2	 52.6	  N/A	  N/A	 21.5	 62.9	 0.1	
Signal Attenuation(dB):	 8.2	 51.6	  N/A	  N/A	 21.5	 62.9	  N/A	
        SNR Margin(dB):	 6.3	 6.3	  N/A	  N/A	 6.6	 6.9	  N/A	
         TX Power(dBm):	-3.8	 5.8	  N/A	  N/A	 11.3	 6.2	  N/A

I see that you are connected to a Huawei DSLM & only able to use US bands U0 & U1, along with D1 & D2, due to attenuation over your line length.
 
Yes, a bit weird, thought I saw your post, then not, ah well.

Thanks for all that info, and the link to the scripts and graphs, its really useful just now to have an understanding of what, why and a little of what to expect in the nest few days.

Is there an ISP who offers fibre and who can opt you out of DLM, or do all ISPs offering BT based fibre have to accept the DLM? (I say BT based because Sky, TalkTalk don't even merit talking about).
 
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