Kitz Forum
Chat => Tech Chat => Topic started by: burakkucat on September 23, 2020, 01:27:38 AM
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Subtitled: Or How a Service Providing Internet Access Used ADSL2, Optical Fibre and VDSL2 Links in Series.
As a diagram will definitely assist with the understanding, please equip yourself with an A4 sheet of paper and a pencil.
Orientate the paper in landscape mode and draw seven rectangles, equally spaced, in a line across the top of the paper. Within each individual rectangle insert one upper-case letter, from A to G, sequentially.
From the left-hand edge of the paper, draw a line to meet the mid-point of the left-hand side of rectangle A. Then draw lines linking the first six rectangles together. Do not draw a line linking rectangles F and G.
Now number the horizontal lines that are linking the rectangles. Between A & B, number it 1 . . . between E & F, number it 5. Finally, in the gap between F & G (there is no horizontal line), number it 6.
On the lower part of the A4 sheet of paper add the legend to the diagram:
(A) NTE5/A and SSFP
(B) Huawei SmartAX MT882
(C) Planet GT-802S
(D) Adva FSP150CC-GE112 (See the FSP 150-GE100 Series (https://www.adva.com/en/products/packet-edge-and-aggregation/carrier-ethernet-edge/fsp-150-ge-100-series) web-page and datasheet (https://www.adva.com/-/media/adva-main-site/resources/data-sheets/pdfs/fsp-150-ge-100-series.pdf). Also Adva's YouTube channel video, linked below.)
(E) Planet VC-231
(F) ZyXEL VMG1312-B10A
(G) Dell Latitude E5500 and kuro neko.
(https://forum.kitz.co.uk/index.php?action=dlattach;topic=13340.0;attach=11065)
(1) Twisted pair cable, 8P2C plug (pins 4 & 5) and 6P2C plug (pins 3 & 4). ADSL2 (ITU-T G.992.3). ATM cells. PPP session.
(2) Ethernet patch cable. PPP session.
(3) Pair of single mode optical fibre cables (as a duplex link). SC/UPC and LC/UPC connectors. PPP session.
(4) Ethernet patch cable. PPP session.
(5) Twisted pair cable, 6P2C plugs (pins 3 & 4) at each end. VDSL2 (ITU-T G.993.2), profile 17a, PTM. PPP session.
(6) IEEE 802.11n wireless link.
https://www.youtube.com/watch?v=WzkBOsU72UE
[Edited to fix the YouTube link.]
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I'm very confused.
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Interesting experiment
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I'm very confused.
And b*cat thought he had carefully detailed everything. :(
Let's try considering the major components of the infrastructure making up the circuit that carries your Zen provided service. Would you agree with the following list --
- Zen owned equipment in the head-end exchange.
- Cable link(s) between the Zen equipment and the BT equipment.
- An ECI OLT.
- Optical fibres(s) from the OLT exit the building, pass through track nodes, etc, then aggregation nodes, before reaching the various fibre cabinets.
- An ECI Hi-FOCuS Mini-Shelf M41 MSAN (used just as a DSLAM).
- Pairs from each line-card port of the M41 pass via wiring harnesses to the Krone strips, then tie-cables to the PCP, D-side cables to DPs, either an aerial drop or an underground feed, NTE5 plus SSFP and, finally, a patch cable to the CPE.
- Your HH5A, running OpenWRT, is the CPE
Now I shall construct another list, with seven bullet points, thus --
- The Huawei SmartAX MT882 [at (B)].
- The Ethernet patch cable [at (2)].
- The Planet GT-802S [at (C)].
- The pair of single mode optical fibre cables (as a duplex link) [at (3)].
- The Adva FSP150CC-GE112 [at (D)], the Ethernet patch cable [at (4)] and the Planet VC-231 [at (E)] all considered as one entity.
- The twisted pair cable [at (5)].
- The ZyXEL VMG1312-B10A [at (F)].
If you consider the first ... seventh bullet point, of the first list, with first ... seventh bullet point, of the second list, can you now see the experimental simulation that I built in The Cattery and described in the opening post of this topic? :)
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Ah, so you are replicating the entire VDSL circuit as close as possible to how its really structured?
I think what threw me was the idea someone is crazy enough to do this and why they would. ;)
Although I have to admit I have considered getting an ethernet to VDSL adapter, just to see how different modems perform when syncing under ideal conditions.
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Ah, so you are replicating the entire VDSL circuit as close as possible to how its really structured?
Yes, that is the case. But it wasn't my original intention.
I had initially planned taking the PPP session, originating in TalkTalk-land (carried to me on an ATM based, ADSL2 circuit), and repackaging it to be carried on a PTM based, VDSL2 circuit as a "fun project" for our friend Weaver to remotely consider and analyse. Whilst laying out all the hardware (before connecting it together), I had the sudden thought: "Can I also include an optical fibre link somewhere in the setup?" The answer was, obviously, a "Yes" and then it occurred to me that I could simulate an entire VDSL2/FTTC circuit from ISP/CP hardware, located in a BT Group building, to the CPE in the end-user's premises.
There were three people who had an inkling that I was "up to something" . . . The indicative paw points towards Weaver, licquorice and CarlT.
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I am ashamed to say that I am too befuddled to look up all the functions of the different models, so a recap / summary would be helpful (am not well at the moment), and this despite the fact that Burakkucat kindly sent me lots of reading material+manuals.