G.INP or Interleaving?

My latency went up on the 16th of this month. Is this likely to be due to G.INP or Interleaving?

Modem is ECI. Cab is Huawei.

Graphs:

http://i.imgur.com/JlgjSAD.png
http://i.imgur.com/ZjLYE4A.png


Thanks.

Interleaving. G.inp doesn't increase latency.

If you have an unlocked modem make sure to upgrade it to latest firmware.

If you're connected to a Huawei DSLAM you should get G.inp in the next few days.

If you're on an ECI DSLAM you will get it some time between now and the next 3 months.

Really?

http://www.ispreview.co.uk/index.php/2015/03/latency...

I'll rephrase.

G.inp isn't supposed to add latency. I have seen a couple of cases where latency has gone up, modems that don't support G.inp seem to end up interleaved and the Openreach system denies that they are.

A firmware update should sort it.

Makes sense. Thanks.

Are you sure G.inp is being rolled out nation wide? My fibre was connected yesterday and the Engineer was under the impression that only selected areas were trialing it still.

When a line is configured for G.INP, some issues are still best dealt with by the FEC+interleaving process, so this can still be configured. I've certainly seen a lot of cases where FEC+interleaving is part of the G.INP configuration.

However, I've found that the FEC overhead is much reduced (around 5% instead of 20%+), and the latency is much reduced (around 0.2ms instead of 8ms).

Why? G.INP is well suited to handling SHINE, but would be overloaded by REIN. The new set of settings for G.INP allow the two to be handled separately.

I've seen it said elsewhere that it would be complete on the Huawei boxes by the end of Q4 (BT's financial dates, so end March). Changeover for ECI DSLAMs would then start, going on into Q1 (April on)

OK cool sounds good. Mine's a Huawei cab so fingers crossed it's turned on in the next few days then.

The Engineer was relatively young and inexperienced so perhaps that explains his lack of knowledge about G.inp.

yeah I just posted this on the plusnet forum, as aaisp have made a complaint to BTw about latency increases which in my view is down to incompatible devices. As you said g.inp at least on some devices when it wont work falls back to interleaving.