Massive jump in sync/obtainable

Wow, at 0345 this morning, my attainable speed jumped to 81804 and sync to 66999 (I am banded and don't know how to get rid of that) - I have never had an attainable speed anywhere near that high. Is this, at last, the much-anticipated vectoring? (I already have G.INP.)

Well I had a re-sync at about 3:30, and some stats have changed a bit since Tuesday evening. The (Bearer 0) interleaving has dropped and the I, N and Q parameters changed. Upstream sync has risen, downstream almost unchanged. Attainable both up a bit, which for a night-time sync is interesting.

Compare with now:-

# xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 15187 Kbps, Downstream rate = 58804 Kbps
Bearer: 0, Upstream rate = 15142 Kbps, Downstream rate = 59997 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Link Power State: L0
Mode: VDSL2 Annex B
VDSL2 Profile: Profile 17a
TPS-TC: PTM Mode(0x0)
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 5.6 5.9
Attn(dB): 19.7 0.0
Pwr(dBm): 13.6 7.4
VDSL2 framing
Bearer 0
MSGc: -6 25
B: 243 237
M: 1 1
T: 0 64
R: 10 16
S: 0.1295 0.5000
L: 15691 4064
D: 8 1
I: 254 127
N: 254 254
Q: 8 0
V: 0 0
RxQueue: 48 0
TxQueue: 16 0
G.INP Framing: 18 0
G.INP lookback: 16 0
RRC bits: 0 24
Bearer 1
MSGc: 122 -6
B: 0 0
M: 2 0
T: 2 0
R: 16 0
S: 8.0000 0.0000
L: 32 0
D: 1 0
I: 32 0
N: 32 0
Q: 0 0
V: 0 0
RxQueue: 0 0
TxQueue: 0 0
G.INP Framing: 0 0
G.INP lookback: 0 0
RRC bits: 0 0
Counters
Bearer 0
OHF: 0 1872018
OHFErr: 0 7
RS: 976963896 623809
RSCorr: 40605 61
RSUnCorr: 0 0
Bearer 1
OHF: 1976902 0
OHFErr: 0 0
RS: 15814723 0
RSCorr: 0 0
RSUnCorr: 0 0

Retransmit Counters
rtx_tx: 62579 0
rtx_c: 125448 0
rtx_uc: 98079 0

G.INP Counters
LEFTRS: 1905 0
minEFTR: 59993 0
errFreeBits: 655222959 0

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 3663670227 0
Data Cells: 2439675 0
Drop Cells: 0
Bit Errors: 0 0

Bearer 1
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 0 0
Data Cells: 0 0
Drop Cells: 0
Bit Errors: 0 0

ES: 108 555
SES: 38 1
UAS: 333 311
AS: 31755

Bearer 0
INP: 48.00 0.00
INPRein: 0.00 0.00
delay: 0 0
PER: 0.00 8.03
OR: 0.01 30.87
AgR: 60058.37 15172.73

Bearer 1
INP: 2.00 0.00
INPRein: 2.00 0.00
delay: 0 0
PER: 16.06 0.01
OR: 63.75 0.01
AgR: 63.75 0.01

Bitswap: 25034/25034 144/145

Total time = 1 days 21 hours 13 min 45 sec
FEC: 21057048 15720
CRC: 2031 1032
ES: 108 555
SES: 38 1
UAS: 333 311
LOS: 2 0
LOF: 17 0
LOM: 0 0
Latest 15 minutes time = 13 min 45 sec
FEC: 83 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 193 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 21 hours 13 min 45 sec
FEC: 373038 159
CRC: 572 17
ES: 11 10
SES: 11 0
UAS: 33 22
LOS: 1 0
LOF: 8 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 427047 777
CRC: 71 7
ES: 3 5
SES: 2 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 8 hours 49 min 13 sec
FEC: 40605 61
CRC: 0 7
ES: 0 4
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
#

Thanks, interesting that it happened at about the same time. I don't know whether these before and after stats give any clues (they are legible if you zoom in).

Some of your details have moved in the opposite direction to mine. I think it's probably just routine DLM adjustments.

Well if so it's very unusual as this is by far the highest I have ever had. I'm still not sure whether that banding will ever go away of its own accord

Been getting weird things happening here, re-sync at about 3:45am a few days ago,sync at 78Mb & attainable was around 110Mb.Usually for my distance it's around 69-70Mb.
Same old pc, same old HG612 & Asus router, nothing different.

Edited by Nightglow (Fri 30-Oct-15 16:17:27)

The plot thickens. Attainable is now 82488. I want my banding removed!

Edited by kasg (Fri 30-Oct-15 17:15:24)

Banding is often due to too many disconnections.

Not in my case, my connection is normally solid for weeks on end.

Do you monitor it using MDWS?

No, I'm not familiar with that. I have HG612 stats logging running and the TBB BQM.

Ah, you mean this http://www.kitz.co.uk/routers/hg612stats.htm ?
MyDslWebStats (MDWS) is just an add on to record your stats from that on the web so everyone can see them.

To me, the only reason for banding is to raise your SNR margin from the default to cope with disconnections. As you have no disconnections, I expect the banding will be removed, but it can take ages. Mine just came off after about a month.

Yes, I mean that, and the GUI front end, I think developed by Ronski. I also use MyDSLWebStats, I didn't recognise the abbreviation MDWS. I am kasg on there.

I have seen mixed reports about whether and when banding is removed; if it goes after a month or so, that's fine by me, but as I said, I have never suffered from disconnects.

Sorry, I should have looked

Amazing sudden divergence on your SNRM

Oh yes, hadn't spotted that.

Looking at my DSLstats my download sync speed went up from about 81Mb to 86Mb early on the 28th. Upload went from about 26Mb to 28Mb at the same time.

I've not done anything and am not aware of any disconnect/reconnect.

My stats:

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 28088 Kbps, Downstream rate = 85440 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 79999 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Link Power State: L0
Mode: VDSL2 Annex B
VDSL2 Profile: Profile 17a
TPS-TC: PTM Mode(0x0)
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 6.1 14.2
Attn(dB): 12.5 0.0
Pwr(dBm): 13.5 1.1
VDSL2 framing
Bearer 0
MSGc: -6 26
B: 130 237
M: 1 1
T: 0 42
R: 8 16
S: 0.0518 0.3781
L: 21468 5374
D: 16 1
I: 139 127
N: 139 254
Q: 16 0
V: 14 0
RxQueue: 60 0
TxQueue: 20 0
G.INP Framing: 18 0
G.INP lookback: 20 0
RRC bits: 0 24
Bearer 1
MSGc: 186 -6
B: 0 0
M: 2 0
T: 2 0
R: 16 0
S: 5.3333 0.0000
L: 48 0
D: 3 0
I: 32 0
N: 32 0
Q: 0 0
V: 0 0
RxQueue: 0 0
TxQueue: 0 0
G.INP Framing: 0 0
G.INP lookback: 0 0
RRC bits: 0 0
Counters
Bearer 0
OHF: 0 1202897
OHFErr: 0 199
RS: 1254618208 1040149
RSCorr: 29089 4932
RSUnCorr: 0 0
Bearer 1
OHF: 14919906 0
OHFErr: 0 0
RS: 179038132 0
RSCorr: 2 0
RSUnCorr: 0 0

Retransmit Counters
rtx_tx: 137261 72248
rtx_c: 105881 4546
rtx_uc: 191017 1249

G.INP Counters
LEFTRS: 1540 37
minEFTR: 79982 19997
errFreeBits: 73130474 398013033

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 2509326781 0
Data Cells: 448110912 0
Drop Cells: 0
Bit Errors: 0 0

Bearer 1
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 0 0
Data Cells: 0 0
Drop Cells: 0
Bit Errors: 0 0

ES: 74175 40325
SES: 606 298
UAS: 11177 11032
AS: 239656

Bearer 0
INP: 48.00 0.00
INPRein: 0.00 0.00
delay: 0 0
PER: 0.00 3.98
OR: 0.01 64.22
AgR: 80614.82 20063.54

Bearer 1
INP: 4.00 0.00
INPRein: 4.00 0.00
delay: 3 0
PER: 16.06 0.01
OR: 95.62 0.01
AgR: 95.62 0.01

Bitswap: 177827/177827 1113/1114

Total time = 1 days 16 hours 49 min 26 sec
FEC: 22646855 1348608
CRC: 42575 15772
ES: 74175 40325
SES: 606 298
UAS: 11177 11032
LOS: 14 0
LOF: 114 0
LOM: 0 0
Latest 15 minutes time = 4 min 26 sec
FEC: 2 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 48 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 16 hours 49 min 26 sec
FEC: 14609 100
CRC: 0 34
ES: 0 33
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 9774 1110
CRC: 0 85
ES: 0 81
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 2 days 18 hours 34 min 15 sec
FEC: 29089 4932
CRC: 0 199
ES: 0 189
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
#

Edited by bsdnazz (Fri 30-Oct-15 21:16:05)

You mean max attainable?

Yes. <fx>hangs head in shame</fx>

DSL stats says the link has been up for 2 days, 18 hours and 44 mins so clearly there's been a drop and reconnect.

Bearer 0 is your sync line. The Max line, (or Attainable in some other presentations) is what the line could achieve if Openreach weren't capping it at 80/20Mbps.

In reply to a post by bsdnazz:

DSL stats says the link has been up for 2 days, 18 hours and 44 mins so clearly there's been a drop and reconnect.

I was just going to point that out to you. It's the last section in the stats you posted .

Well that didn't last. After just under a week I had a resync at 13:31 today at 64536 (Reason: 1 Remote Defect Indicator/DLM) and my attainable is down to 63932 from 82488. I wonder what caused the jump and why has it reverted to where it was?

If anyone is capable of interpreting the great long string from modem_stats.log:

Before:
05/11/2015 13:31 66999 19999 5.3 9.2 14.0 6.9 82488 16368 PTM 1070 4430 1683170 65154 0 0 553562 0 485 7168 0 153.767 290947 27058 7168 0 4205415 0 485 750 485 3490668080 1529473 3171552 0 0 0 16 1 22 2341 20 31 10 10 20245 633305 15085 0 4.3 21.1 32.2 0.0 11.2 26.6 41.3 4.3 21.2 32.1 0.0 13.3 26.2 41.2 10.6 8.0 9.7 0.0 5.6 5.3 5.0 -3.4 -22.4 6.6 0.0 11.5 7.9 7.0 Showtime 1 1 L0 17a ON ON No Showtime 16.4 0.0 158 237 1 1 0 42 8 16 0.0754 0.3781 17724 5374 0 0 0 0 2601818657 0 1414376953 0 0 0 0 63 52 49.00 0.00 0.00 3.98 0.00 0.00 0.01 64.22 418392 964 VDSL2 46 4 49 0 0.00 0.00 0.00 0.00 0 0 1 0 0 0 10 0 0 0 1 0 1 0 G.INP 0 0 16 0 7 0 42 0 14 0 18 0 14 0 0 24 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 34462505 0 3735 0 0 0 0 0 344624436 0 2596 0 2593 0 0 0 0 0 70090 0 46 0 28512 0 26 0 69244 0 27836 0 338 0 66979 0 1132727547 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.00 0.00 4.50 0.00 4.50 0.00 3 0 16.06 0.01 79.68 0.01 79.68 0.01

After:
05/11/2015 13:33 64536 19999 6.3 7.1 13.9 6.9 63932 21718 PTM 1723 4465 1687466 65713 0 0 80 0 653 4296 0 0.022 20 0 0 0 19915 0 0 0 0 2581416 836085 0 0 0 0 8 1 34 2342 32 31 12 1 0 0 0 0 4.3 21.1 32.2 0.0 11.3 26.6 41.3 4.3 20.2 31.3 0.0 13.3 26.4 41.3 7.2 7.0 7.1 0.0 6.3 6.3 6.3 -3.7 -22.3 6.5 0.0 11.3 7.8 7.1 Showtime 1 1 L0 17a ON ON No Showtime 16.4 0.0 243 237 1 1 0 42 10 16 0.1204 0.3781 16878 5374 0 0 0 0 9772737 0 354 0 0 0 0 104 81 48.00 0.00 0.00 3.98 0.00 0.00 0.01 64.22 45 1 VDSL2 0 0 0 0 0.00 0.00 0.00 0.00 0 0 2 0 1 0 18 0 8 0 1 0 0 0 G.INP 0 0 8 0 0 0 51 0 17 0 18 0 17 0 0 24 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4918 0 0 0 0 0 0 0 48560 0 0 0 0 0 0 0 0 0 70090 0 0 0 28541 0 29 0 106327 0 37083 0 350 0 64532 0 1982031579 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.00 0.00 4.50 0.00 4.50 0.00 3 0 16.06 0.01 79.68 0.01 79.68 0.01

Edit: here is the minute before. I just noticed that upstream attainable took a dive from 23409 to 16368 just before the resync.

05/11/2015 13:30 66999 19999 5.2 13.9 14.0 6.9 82260 23409 PTM 585 4381 1676002 44909 0 0 553502 0 0 61 0 153.751 283779 6813 61 0 4190330 0 0 701 0 3487496528 896168 3171568 0 0 0 16 1 12 2331 11 28 0 0 0 636796 15169 0 4.3 21.1 32.2 0.0 11.2 26.6 41.3 4.3 20.4 31.2 0.0 13.3 26.2 41.2 15.2 13.9 13.9 0.0 5.2 5.2 5.2 -3.4 -22.4 6.6 0.0 11.5 7.9 7.0 Showtime 1 1 L0 17a ON ON No Showtime 16.4 0.0 158 237 1 1 0 42 8 16 0.0754 0.3781 17724 5374 0 0 0 0 2595150125 0 1414375534 0 0 0 0 63 52 49.00 0.00 0.00 3.98 0.00 0.00 0.01 64.22 418346 960 VDSL2 52 0 0 0 0.00 0.00 0.00 0.00 0 0 1 0 0 0 10 0 0 0 0 0 0 0 G.INP 0 0 16 0 7 0 42 0 14 0 18 0 14 0 0 24 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 34458770 0 3736 0 0 0 0 0 344587081 0 3 0 0 0 0 0 0 0 70044 0 4 0 28486 0 4 0 41408 0 0 0 328 0 67020 0 1132674654 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.00 0.00 4.50 0.00 4.50 0.00 3 0 16.06 0.01 79.68 0.01 79.68 0.01

Edited by kasg (Thu 05-Nov-15 20:09:11)

I've been getting weird things happening with my line where the downstream SNRM randomly jumps from 6dB to around 14dB for a couple of hours and returns to 6dB.

I resynced my router during one of these jumps and the downstream sync went up to just under 60 Mbps with a 10.5dB SNRM and a 74 Mbps max attainable. I also notice the QLN graph had dropped by around 10dBm/Hz across the board. Interestingly the max attainable is around what it used to be before I had a sudden 20 Mbps drop in sync 2 years ago which Openreach put down to deteriorating Cu/Al joints in the cable between the PCP and the DP I'm connected to.

In reply to a post by kasg:

Well that didn't last. After just under a week I had a resync at 13:31 today at 64536 (Reason: 1 Remote Defect Indicator/DLM) and my attainable is down to 63932 from 82488. I wonder what caused the jump and why has it reverted to where it was?

I'm not 100% convinced that you ever had a real attainable value that high. Generally, a high attainable value (compared to actual) only comes about because the actual SNRM is well above 6dB. My line has about 26Mbps "unused", which goes alongside an SNRM value of 12.5dB

It looks, to me, that the modem is mis-calculating the attainable, or mis-reporting the SNRM value.

In reply to a post by kasg:

If anyone is capable of interpreting the great long string from modem_stats.log:

Before:
05/11/2015 13:31 66999 19999 5.3 9.2 14.0 6.9 82488 16368 PTM 1070 4430 1683170 65154 0 0 553562 0 485 7168 0 153.767 290947 27058 7168 0 4205415 0 485 750 485 3490668080 1529473 3171552 0 0 0 16 1 22 2341 20 31 10 10 20245 633305 15085 0 4.3 21.1 32.2 0.0 11.2 26.6 41.3 4.3 21.2 32.1 0.0 13.3 26.2 41.2 10.6 8.0 9.7 0.0 5.6 5.3 5.0 -3.4 -22.4 6.6 0.0 11.5 7.9 7.0 Showtime 1 1 L0 17a ON ON No Showtime 16.4 0.0 158 237 1 1 0 42 8 16 0.0754 0.3781 17724 5374 0 0 0 0 2601818657 0 1414376953 0 0 0 0 63 52 49.00 0.00 0.00 3.98 0.00 0.00 0.01 64.22 418392 964 VDSL2 46 4 49 0 0.00 0.00 0.00 0.00 0 0 1 0 0 0 10 0 0 0 1 0 1 0 G.INP 0 0 16 0 7 0 42 0 14 0 18 0 14 0 0 24 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 34462505 0 3735 0 0 0 0 0 344624436 0 2596 0 2593 0 0 0 0 0 70090 0 46 0 28512 0 26 0 69244 0 27836 0 338 0 66979 0 1132727547 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.00 0.00 4.50 0.00 4.50 0.00 3 0 16.06 0.01 79.68 0.01 79.68 0.01

After:
05/11/2015 13:33 64536 19999 6.3 7.1 13.9 6.9 63932 21718 PTM 1723 4465 1687466 65713 0 0 80 0 653 4296 0 0.022 20 0 0 0 19915 0 0 0 0 2581416 836085 0 0 0 0 8 1 34 2342 32 31 12 1 0 0 0 0 4.3 21.1 32.2 0.0 11.3 26.6 41.3 4.3 20.2 31.3 0.0 13.3 26.4 41.3 7.2 7.0 7.1 0.0 6.3 6.3 6.3 -3.7 -22.3 6.5 0.0 11.3 7.8 7.1 Showtime 1 1 L0 17a ON ON No Showtime 16.4 0.0 243 237 1 1 0 42 10 16 0.1204 0.3781 16878 5374 0 0 0 0 9772737 0 354 0 0 0 0 104 81 48.00 0.00 0.00 3.98 0.00 0.00 0.01 64.22 45 1 VDSL2 0 0 0 0 0.00 0.00 0.00 0.00 0 0 2 0 1 0 18 0 8 0 1 0 0 0 G.INP 0 0 8 0 0 0 51 0 17 0 18 0 17 0 0 24 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4918 0 0 0 0 0 0 0 48560 0 0 0 0 0 0 0 0 0 70090 0 0 0 28541 0 29 0 106327 0 37083 0 350 0 64532 0 1982031579 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.00 0.00 4.50 0.00 4.50 0.00 3 0 16.06 0.01 79.68 0.01 79.68 0.01

Edit: here is the minute before. I just noticed that upstream attainable took a dive from 23409 to 16368 just before the resync.

05/11/2015 13:30 66999 19999 5.2 13.9 14.0 6.9 82260 23409 PTM 585 4381 1676002 44909 0 0 553502 0 0 61 0 153.751 283779 6813 61 0 4190330 0 0 701 0 3487496528 896168 3171568 0 0 0 16 1 12 2331 11 28 0 0 0 636796 15169 0 4.3 21.1 32.2 0.0 11.2 26.6 41.3 4.3 20.4 31.2 0.0 13.3 26.2 41.2 15.2 13.9 13.9 0.0 5.2 5.2 5.2 -3.4 -22.4 6.6 0.0 11.5 7.9 7.0 Showtime 1 1 L0 17a ON ON No Showtime 16.4 0.0 158 237 1 1 0 42 8 16 0.0754 0.3781 17724 5374 0 0 0 0 2595150125 0 1414375534 0 0 0 0 63 52 49.00 0.00 0.00 3.98 0.00 0.00 0.01 64.22 418346 960 VDSL2 52 0 0 0 0.00 0.00 0.00 0.00 0 0 1 0 0 0 10 0 0 0 0 0 0 0 G.INP 0 0 16 0 7 0 42 0 14 0 18 0 14 0 0 24 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 34458770 0 3736 0 0 0 0 0 344587081 0 3 0 0 0 0 0 0 0 70044 0 4 0 28486 0 4 0 41408 0 0 0 328 0 67020 0 1132674654 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.00 0.00 4.50 0.00 4.50 0.00 3 0 16.06 0.01 79.68 0.01 79.68 0.01

In time order, your downstream attainable speed goes
82260 -> 82488 -> 63932

meanwhile, downstream SNRM goes
5.2 -> 5.3 -> 6.3

Upstream, the same things are:
23409 -> 16368 -> 21718
13.9 -> 9.2 -> 7.1

On downstream, the attainable values just don't make sense with the comparable SNRM values. To really have an unused 15Mbps, you ought to have around 3-4dB spare SNRM, or a *lot* of bandwidth allocated to old-style FEC+interleaving.

On upstream, things seem even messier. There, it suggests funny things are happening on the line - perhaps noise.

On that front, I looked at the two graphs you posted originally. The most noticeable difference, to me, is the QLN graph. NB: This graph only shows what the noise environment looked like at the most recent re-sync, so doesn't change often.

The two QLN graphs show more than a 10dB difference in the noise environment (at the time of the syncs). The two SNRM graphs (with live values) show barely any difference, which suggests that the *live* noise environment is pretty similar.

Taken together, the difference in QLN but similarity in SNRM, suggests that the noise on your line can change significantly. The data isn't enough to say why this happens, or how often/regularly. That it does happen is something to consider.

Thanks very much for your analysis, but it did look to me that if I hadn't been banded at 66999 I would have synced at the maximum speed for those six days. Although the upstream SNRM diverged hugely for that period, the downstream SNRM seemed pretty stable and that was the one of most interest as I've always had maximum upstream sync anyway. It's not a problem, I'm perfectly happy with what I've got, but there did seem to be a few others that had reported strange things happening at about when I did.