You get reflections an APC as well. The main thing is the better mating so reduced optical loss. With PON the downstream signal is being split many ways (with Openreach I believe up to 32 ways) so reducing the optical loss is important. With more traditional networking where every connection gets its own fibre (or pair of fibres) then UPC is more than adequate.

Link worked for me.

W7 - Chrome

Note that everything from fs.com comes from Germany or from China via Germany. So you want to be over £79 but under the threshold (about £120 I think) otherwise it can get tied up in customs and the monkeys employed at UPS are not the brightest (your telephone number does not work doh it begins 44 you moron, my 76 year old mother knows what to do there) and it can get stuck for weeks. The problem is fs.com are not charging VAT as they exempt from duty anyway.

Took 46 days to get eight 40Gbps QSFP+'s and four MTP patch cables through customs. But hey the £30 from fs.com each and £250 for the switch vendor ones. Next order of some SFP+ cables over £79 but under £100 just sailed through.

The gift that is Brexit. Never any problems in the past.

In reply to a post by jabuzzard:

You get reflections an APC as well. The main thing is the better mating so reduced optical loss. With PON the downstream signal is being split many ways (with Openreach I believe up to 32 ways) so reducing the optical loss is important. With more traditional networking where every connection gets its own fibre (or pair of fibres) then UPC is more than adequate.

Absolute insertion loss (which is what I think you're referring too when you say 'optical loss', correct me if I'm wrong) is basically the same for both end face types. APC through has superior return loss often by 10 dB or more which can be a massive difference.

UPC was traditionally used in LAN applications, as prior to the advent of BiDi's, optical links required a duplex path for Tx and Rx separate fibres- so you basically don't really give a stuff about return loss or reflections.

On analog circuits, CATV etc and also digital circuits that have forward and return bidirectional light on the same fibre core (e.g leased line, WAN comms), you very much do care about return loss and reflections so its typical to see APC specified in these apps. This is exacerbated by the somewhat higher / longer wavelengths used in these applications 1490nm, 1550nm, 1625nm etc. which are more susceptible to reflection.

Edited by Pheasant (Thu 12-Aug-21 17:59:40)

In reply to a post by jabuzzard:

Note that everything from fs.com comes from Germany or from China via Germany. So you want to be over £79 but under the threshold (about £120 I think) otherwise it can get tied up in customs and the monkeys employed at UPS are not the brightest (your telephone number does not work doh it begins 44 you moron, my 76 year old mother knows what to do there) and it can get stuck for weeks. The problem is fs.com are not charging VAT as they exempt from duty anyway.

Took 46 days to get eight 40Gbps QSFP+'s and four MTP patch cables through customs. But hey the £30 from fs.com each and £250 for the switch vendor ones. Next order of some SFP+ cables over £79 but under £100 just sailed through.

The gift that is Brexit. Never any problems in the past.

Late December and January/February was a right nightmare to get anything through customs/delivery companies. It's a lot better since.

The worst I had was stuff back ordered in December (and earlier), that was delayed for other reasons, then which got caught in the new rules post January 1.

Edited by Pheasant (Thu 12-Aug-21 17:49:24)

This any help
https://www.premitel.uk/consultancy/expert-advice/ho...

In reply to a post by agkq62:

This any help
https://www.premitel.uk/consultancy/expert-advice/ho...

Same ones as on fleabay linked above no?

The issue with those is that they introduce multiple mated connections in that adapter box. It is not necessary at all as they claim. In fact it probably makes matters worse as you are introducing several potential places for contamination and also insertion loss of mated couplers is one of the worse things in a fibre link.

The best and easiest thing is to simply order a green SC/APC (simplex) single-mode coupler and an SC/APC simplex fibre patch lead (green connectors with yellow sheath) of the length required, no more and no less.

Carefully disconnect the fibre connector going into the ONT, connect it to one side of the new coupler. Take the patch lead from its bag, carefully remove the protective cap, connect it into the other side of the coupler. Take the other end, remove its protective cap and plug it into the ONT.

That is literally all there is to it. 20 seconds.

All yours for £12.79 delivered in 2 days from Comtec (one of the largest indy network and cabling wholesalers in the country).

Edited by Pheasant (Thu 12-Aug-21 19:41:28)

You're right... it didn't work...

No sooner had I unplugged the fibre from the ONT, there was a knock on the door... three OpenReach officers took me away. A ten hour interview under caution and I'm in the magistrates tomorrow morning. My solicitor says with an early guilty plea, some good mitigation and a lenient judge I may only get ten years inside. Because my wife ordered the cable on Amazon, it's a joint enterprise, so she's looking at a ten stretch too.

What's more, when we are finally released we're going to have to rebuild our house as the laser beam from the fibre has burnt the house down.

Don't try and move your ONT at home kids.

Dang. I'll bake you a cake. 😎😂

I thought the same looking at the premitel page too, not sure why there's all the faff with the extra joins and the box.

I should add the only reason I was looking at the premitel website was for research because someone I once knew who told me their distant relative's neighbour moved their ONT (not in the UK I should add).