I am on an ECI cabinet but if pigs fly and we get G.INP does it help with reduced sync speeds due to crosstalk? I have been hit quite hard by crosstalk but my line has not gone to interleaved yet. Thanks
I'm around 1100m from the cabinet & my DS sync speed has reduced from around 30 Mbps to 22.4 Mbps due to increased crosstalk since FTTC was installed in 2011.
My connection's speeds have been capped/banded at 22.4 Mbps / 5 Mbps for many months, with the last few months being on fastpath (actually 22399 Kbps / 4999 Kbps).
Although on fastpath (Interleaving depth 1 for both DS & US), I did see lowish levels of DS & US FEC (RSCorr), with zero INP, INPRein & delay.
I believe that was due to Broadcom's own phyReXmt retransmission technology, not G.INP.
The sequence of events whenever another crosstalk disturber was added have ALWAYS been as follows:-
SRNM would show a sudden, but smallish (up to 2 dB) reduction.
Various error counts would increase (particularly ES & CRC).
This position would be sustained for a few days until the connection resynced at a lower speed, with SNRM being reinstated to the usual 6 dB.
We do experience occasional power cuts where I live (properties closer to the cabinet are not affected).
Before my connection speeds were banded, my connection would sync with SNRM still at 6 dB, but with sync speeds around 5 Mbps higher when power was restored.
After a few minutes or so, SNRM would reduce, often to below 1 dB, but the higher sync speed would be maintained.
This would last for a couple of days until the connection would resync at the usual lower speeds, with SNRM back to 6dB again.
My conclusion is that as my VDSL2 HG612 modem syncs up quicker than typical ADSL modem/routers, I would experience a few minutes of low crosstalk until the ADSL modems in my area had synced up again.
I presume that as other VDSL2 & ADSL modems closer to the cabinet had remained in sync throughout due to not experiencing the power cut, some crosstalk would be present when my connection synced & thus my speeds weren't temporarily restored to the 30 Mbps.
Now that my connection's sync speeds are banded, I do see temporarily increased attainable rates following a power cut, but no increased sync speeds.
I have been reliably informed that the FTTC cabinet is now full, so I am unlikely to see much in the way of further crosstalk increases from VDSL2 connections, but I could possibly see increases whenever more ADSL connections are installed.
See the attached montage for how my connection stats changed when G.INP was activated 23/03/15.
Important error counts such as ES, CRC, RSUnCorr & possibly HEC have all but disappeared since G.INP was activated, but as SNRM is still around 6 dB, there has been no increase in attainable rates or sync speeds.
e.g. DS ES was running at around 1000 per day pre-G.INP. It is now usually 1 or 2 per day.
So, in summary,
some users will see improved speeds when G.INP is activated (subject to having sufficient SNRM & probably previously interleaved) & others, such as myself will see vastly reduced error counts, but no improvement in SNRM & therefore no improvement in sync speeds.