Zarjaz or anyone look in

Why is my fibre label called Fibre count 36F when it only has from what I can see 3 strands of fibre.

Contractors here again today finishing our FTTP install and gave me a cut-off as I asked him for a piece.

Sorry I just like to learn.

Fibre 36F

Fibre I opened up just now.

There are three tubes, Blue, Orange, Green, each with 12 fibres in, I believe:

You get 12, 24, 36, 48, 72, 96, 144 variants

In reply to a post by MHC:

There are three tubes, Blue, Orange, Green, each with 12 fibres in, I believe:

You get 12, 24, 36, 48, 72, 96, 144 variants

WOW MHC you are correct, I've just peeled off the Blue Orange & Green sheath and lots of minuit fibre strands in each.

How the hell does that send ultra fast internet to our homes over a long distance when it looks only as thick as a sheet of paper.

Have a read of a catalogue https://www.emtelle.com/wp-content/uploads/2017/03/2... from a fibre manufacturer.

I've said it many times

You learn something everyday

Thank you.

Had looked at pic but not next post, but was about to say you need to strip off the coloured bit.

All down to the refractive index and how the fibre is created, i.e. glass at edge of each keeps light in, so clear transmission down the central part.

In reply to a post by MrSaffron:

Had looked at pic but not next post, but was about to say you need to strip off the coloured bit.

All down to the refractive index and how the fibre is created, i.e. glass at edge of each keeps light in, so clear transmission down the central part.

I'm amazed I must say.

Be careful with the glass - you don't want to get a broken off piece stuck in your skin

In reply to a post by busterboy:

I'm amazed I must say.

We learn together

In reply to a post by MHC:

Have a read of a catalogue https://www.emtelle.com/wp-content/uploads/2017/03/2... from a fibre manufacturer.

Very interesting especially the colour code sequences, loosely reminds me of copper (e.g. blue, orange, green, brown, slate paired with white, red, black, yellow. Appreciate no pairing with fibre.)

In reply to a post by dect:

In reply to a post by MHC:

Have a read of a catalogue https://www.emtelle.com/wp-content/uploads/2017/03/2... from a fibre manufacturer.

Very interesting especially the colour code sequences, loosely reminds me of copper (e.g. blue, orange, green, brown, slate paired with white, red, black, yellow. Appreciate no pairing with fibre.)

Sheath Thickness 1.6mm for Aerial (ADSS) Fibre Optic Cable


Thought it was thin..

Logical though ...

In reply to a post by busterboy:

In reply to a post by dect:

In reply to a post by MHC:

Have a read of a catalogue https://www.emtelle.com/wp-content/uploads/2017/03/2... from a fibre manufacturer.

Very interesting especially the colour code sequences, loosely reminds me of copper (e.g. blue, orange, green, brown, slate paired with white, red, black, yellow. Appreciate no pairing with fibre.)

Sheath Thickness 1.6mm for Aerial (ADSS) Fibre Optic Cable


Thought it was thin..

Wow

In reply to a post by MHC:

Logical though ...

Certainly is

In reply to a post by busterboy:

How the hell does that send ultra fast internet to our homes over a long distance when it looks only as thick as a sheet of paper.

In a data centre I've seen multi core fibre arrive in a rack and then into a splice tray, feeding 10 or more connector (SC) which we then connected to the storage HBA's in the servers.

Fibre is cool.

In reply to a post by jchamier:

Fibre is cool.

Can't tell you how much I want to dump my current copper Iv'e had for too many years.

In reply to a post by busterboy:

How the hell does that send ultra fast internet to our homes over a long distance when it looks only as thick as a sheet of paper.

Shine a torch down one end, look at the other end but keep the fibre away from you eyes !.

In reply to a post by busterboy:

Sheath Thickness 1.6mm for Aerial (ADSS) Fibre Optic Cable

Thought it was thin..

By the time you get down to the core that carries the light, that's 9 microns (0.009mm) in diameter - inside a 125 micron glass outer cladding.

https://en.wikipedia.org/wiki/Single-mode_optical_fiber

In reply to a post by candlerb:

In reply to a post by busterboy:

Sheath Thickness 1.6mm for Aerial (ADSS) Fibre Optic Cable

Thought it was thin..

By the time you get down to the core that carries the light, that's 9 microns (0.009mm) in diameter - inside a 125 micron glass outer cladding.

https://en.wikipedia.org/wiki/Single-mode_optical_fiber

Even more amazing. Contractors are at my gate as I type this right now. Time to make a cuppa for them.

The guts of my fibre CSP shows really well how thin the fibre strands are....as well as being colourful

https://postimg.cc/n9QFKNVr

Edited by deleted (Wed 08-Jul-20 11:08:43)

In reply to a post by Highland76:

The guts of my fibre CSP shows really well how thin the fibre strands are....as well as being colourful

https://postimg.cc/n9QFKNVr

Blue, Orange and green I see.

Are all three strands of fibre used for your connection or just one (and which colour)

In reply to a post by busterboy:

In reply to a post by Highland76:

The guts of my fibre CSP shows really well how thin the fibre strands are....as well as being colourful

https://postimg.cc/n9QFKNVr

Blue, Orange and green I see.

Are all three strands of fibre used for your connection or just one (and which colour)

You forgot the red one Only the blue one is used for service, the other three are kept as spares. I had fibre blown to the CSP which they don't (or very rarely) do these days.

Edited by deleted (Wed 08-Jul-20 11:41:36)

In reply to a post by Highland76:

You forgot the red one Only the blue one is used for service, the other three are kept as spares.

Interesting that is, so in many ways having spare fibre is similar to the old copper lines (obviously copper is in pairs) which can be used for addressing problems or even broken lines.

Is fibre known to ever break or cause faults or is it quite sturdy, it either works 100% or not at all.

I see the wire strands in the piece I stripped down but did wonder about the strength of the actual fibre.

jchamier

Yu forgot to say each individual fibre could be carrying 1Gb 10Gb, 40Gb or 100Gb and could also be carrying more than one of these by using multiple wavelengths.

I remember planning the installation of systems carrying 16 WDM 'channels' over two fibres over 10 years ago. (With 32 WDM systems available carrying 40Gb in each, so 1280Gb in 2 fibres) We only needed one (resilient) 10Gb connection between core routers back then!

Fibre is reasonably strong if the force is applied laterally, but fragile to sharp bends.

Pull a piece between or fingers, and it is sound, make a loop and pull, it breaks very easily.

In reply to a post by kitcat:

Yu forgot to say each individual fibre could be carrying 1Gb 10Gb, 40Gb or 100Gb and could also be carrying more than one of these by using multiple wavelengths.

I remember planning the installation of systems carrying 16 WDM 'channels' over two fibres over 10 years ago. (With 32 WDM systems available carrying 40Gb in each, so 1280Gb in 2 fibres) We only needed one (resilient) 10Gb connection between core routers back then!

Its good stuff!

I too find this all very interesting,

Am I right in thinking that those individual fibres get joined together at the pole or in the manhole via a splitter?

If so is the feed from the splitter back to the next node a single fibre?

In reply to a post by StuB:

I too find this all very interesting,

Am I right in thinking that those individual fibres get joined together at the pole or in the manhole via a splitter?

If so is the feed from the splitter back to the next node a single fibre?

From the Openreach handover exchange to the splitter node (via an aggregation node) is a single fibre, the fibre is split up to 32 ways in the splitter and each of those fibres head off to the individual connectors on the connectorised block terminals which is where the cable from a property runs too.


I am sure others will explain it in more details if required.

Edit: Worth adding the fibre is joined/spliced many times from the exchange to the property as its not a single piece of fibre.

Edited by deleted (Sat 11-Jul-20 11:03:30)

Thanks for the reply and info. The geek in me always likes to know this sort of stuff.

So at the splitter node where 1 fibre becomes up to 32 how is the split achieved?

Do they use different wavelengths for each fibre so they can overlay the signals?

Is the single fibre (the actual glass part that carries the signal) from the splitter back to the exchange the same size as the ones to each home?

I also appreciate it's not a single strand from exchange to home and there are lots of joints.

Over the years I've seen the geek headlines about the amount of data that Universities and Tech companies have managed to stuff down a piece of fibre and the mind boggles as to how it can work in much the same way as when you look at the number of stars in the sky and realise how many billions of galaxies are out there.

The single fibre is split in to 32.
It's a passive splitter, no processing done what so ever.

Each of those 32 fibres all contain the exact same data as the single fibre.
You have your data on your 1 fibre but you also have the data of the other 31 people running on your fibre.

Your ONT receives the exact same as everyone else's ONT but it is all encrypted.
Your ONT only has the key to decrypt your data.

I hadn't thought of that but that makes complete sense as I know a single fibre is capable of far greater performance than on offer in the home.

I also find it remarkable they can make what I assume is a relatively cheap device like an ONT to decrypt and process information that quickly.