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Author Topic: ECI Cabs not all bad news.  (Read 1170 times)

Jon21

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Re: ECI Cabs not all bad news.
« Reply #15 on: July 11, 2018, 02:01:33 PM »

I've applied a -30 offset which has given a 3db margin. Gone from 62.7 to 71.6Mb sync. Will have to keep an eye on the ES but they seem similar to a 6db margin at the moment.
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Ixel

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Re: ECI Cabs not all bad news.
« Reply #16 on: July 11, 2018, 02:32:46 PM »

Just to note, be careful of adjusting the SNRM offset by too much in one go. I believe it can encourage DLM to apply banding if it detects a significant change in SNRM in a certain timeframe. One of the patents mentioned an SNRM variation of 4 dB, which I think is a good guide to go with I believe. My advice is to avoid adjusting it by more than +/- 3 dB in 24 hours, unless you have a somewhat varying SNRM in which case be more cautious.
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j0hn

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Re: ECI Cabs not all bad news.
« Reply #17 on: July 11, 2018, 10:34:21 PM »

I wouldn't worry about that in the slightest.
I've seen dozens of lines on mdws that varied by 10dB+ all day long and never seen DLM act on this.

I've applied caps on my line making the SNRM jump from 3dB to 20dB and back again many times without problem. As long as MTBR isn't breached.

I've seen many screenshots of DLM caution counters, never seen anything SNRM related.

I'd be surprised if DLM even recorded the current SNRM.
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BT FTTC 55/10 ECI now Huawei cab
Zyxel VMG1312-B10A bridge mode with 1508 MTU + Asus RT-AC68U running Asuswrt-Merlin

Ixel

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Re: ECI Cabs not all bad news.
« Reply #18 on: July 11, 2018, 10:46:02 PM »

There's a lot we don't know about DLM to be fair. For example, my connection was recently banded after experiencing a few re-syncs in a short timeframe and what must've been a fairly significant SNR variation during those re-syncs. ES/SES were well under the threshold. The number of retrains should've also been under the threshold but I guess there was something DLM didn't like. It's possible that DLM ignores SNR variation while the connection is 'SHOWTIME' but if it changes between re-syncs then it might factor that in.
« Last Edit: July 11, 2018, 10:48:13 PM by Ixel »
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Bowdon

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Re: ECI Cabs not all bad news.
« Reply #19 on: July 16, 2018, 04:06:22 PM »

I was just looking on an FTTP thread in another place and noticed we ECI people might be still at a disadvantage when we finally get FTTP deployed.

They were commenting about the higher FTTP speeds on the dsl checker showing up, and Paul said that his checker was still only showing 300 down 50 up. Then someone else responded that might be because he's on an ECI FTTP deployment "That's all it will ever go to for the foreseeable!".

Later in the thread, j0hn83 said;
Quote
OpenReach used both the same vendors for the FTTP kit, both OLT's at the exchange and ONT's in customer premises.

They also have ECI/Huawei L2S's
ECI L2S can only do 1Gb GEA Cablelinks but the Huawei L2S can have 10Gb GEA cablelinks.

This is why some only see 330/50.

Almost every piece of ECI kit is inferior to the Huawei kit or it has an issue being upgraded on some way. It's not just the FTTC DSLAMs that are useless.

edit: to add, I'm sure there's also an issue where ECI OLT/ONT's can't do fva

I guess the question is, how big of a job would OR have to do to allow ECI FTTP people to be able to get above 330/50 ?

I wonder what the actual contract OR have with ECI states. Because nearly every upgrade that OR as attempted with ECI as failed, or OR aren't confident of rolling it out across the network. I would have thought OR would have had printed about future proof upgrades.
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BT Infinity 2 - Smart Hub 6 - ECI Cab
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