What's happened to my connection?

I have been on 55/10 FTTC for the past 18 months due to me being unsure what the line was capable of when I moved in. I'm around 350m from my Huawei cab.

To my surprise the attainable rate has always been 68/20, even with a BT Smart Hub that rebooted every few days. The data rate was always 55/10 and it was always in Fastpath - so a nice low ping.

I decided to go ahead and order 76/20 with EE and ordered a TP-Link Archer VR400 due to some wireless issues I have been having. The VR400 synced at 54997kbps which I thought was weird. I have always synced at 55000kbps downstream. The attainable rate was 65/13 which I thought was strange as my Smart Hub always said 20mbps for the upload.

Wireless on the VR400 was woeful so I bought a separate router and plugged in my HG612. This synced at 54997kbps with an interleaved depth of 1340 on the downstream and 1 on the upstream.

Today I migrated over to EE and the connection is now synced at 56/20. No G.INP, 6db SNR and interleaving is ON.

Any idea what is going on? Is it simply cross talk from a new connection?

I did have a line issue last year with water ingress and the connection gradually ground to a halt after a storm and BT 'repaired' it. They also put me on an NTE 5C master socket which my HG612 is mounted above.

I have DSL Stats so can provide tone graphs etc if needed.

Edited by wolvesmad (Fri 24-Jan-20 15:12:17)

Different modems perform different.
1 modem gives my brother 1.5Mb upload while my Zyxel gives him 6.2Mb upload.
Ignore the differences between modems.

When migrating the DLM is reset. This can do a number of things to change sync rate and attainable.

Interleaving comes with a new connection or migration, lowering sync and exaggerating the max attainable.

With a settled connection performing well G.INP can increase sync and DLM can also lower the target SNRM which increases sync and attainable.

The difference between 55,000 and 54,997 is diddly squat.
Simply the difference between how modems report or round off numbers.

Edited by j0hn83 (Fri 24-Jan-20 15:12:38)

I forgot to add the Smart Hub synced at 54997 too when I plugged it back in. After 18 months at 55000 and still displaying a higher attainable.

There is a serious dip in the HG612's tone graph around tone 300 but apart from that it looks decent from what I can tell.

I'm no REIN specialist though.

That dip in tones is DPBO and everyone has it.

The 55,000 to 54,997 may simply be the Interleaving.

Wait for G.INP to return. This happens with migrations.

Could it be G.INP was running all along and me switching modems has disturbed this?

No.
Migrating to another ISP had triggered a DLM reset.

All new connections, migrations and DLM resets should default to Interleaving with no G.INP (both ECI and Huawei cabinets).

For those on Huawei cabinets G.INP will return within a few days (occasionally weeks).

For ECI cabinets the line can then go to fastpath.

Give it some time for the line to settle after the move of ISP and the DLM reset then worry about this.

Just curious as to why the attainable rate of the connection before the DLM reset had dropped by 10mbps.

It's gone from 66-68mbps to 56mbps and interleaving has been turned on.

Attainable rates are a bit random with G.INP in the mix it seems (from other posters)

So if G.INP is off now, and was on before looks like wait for everything to settle in and G.INP to switch back on.

On the VR400 G.INP was disabled (when it was showing the attainable at 68/13)