141–150 of 250 posts
Earlier quoted context omitted.
_minimum_ bend?
Fibers can be bent to a radius of an inch or so, that's the tolerated minimum bend radius. I guess you could call it "the maximum sharpness tangency" or something like that, but that's not the standard verbiage.
Earlier quoted context omitted.
_minimum_ bend?
It’s usually 20x the outer diameter of the cable for fiber, a cable with a .3 inch OD has a 6 inch minimum bend radius.
This is 100% wrong.
This is well standardized. As I posted elsewhere:
G.657A1/B1 = 10mm (half an inch)
G.657A2/B2 = 7.5mm (a little over a quarter inch)
G.657A3/B3 = 2.5mm (less than 1/8th of an inch)
The only cable you will find with a 6 inch bend radius is going to be armored interlocking fiber cable or something.
You can take 2mm G657.A3 fiber cable, wrap it around a pencil, and it will work 100% fine.
Even old G652 cable only had a 1 inch bend radius.
Earlier quoted context omitted.
If you go that route MOCA over your cable tv coax works very well too!
I recently bought my first house, and there was only one coax outlet in the entire place, and zero ethernet. I wanted to move where the coax terminated, and after some searching around, found MOCA. Had never heard of it before, but a hundred bucks or so later, and it's a fantastic solution.
I ask, as my brother-in-law just finished a house where he had asked the contractor to put in internet cabling everywhere, and... drum roll... yes the contractor put in coax everywhere. I tried powerline adapters, but could only get ~30-40mbps (he has a 1gbps fiber connection from the ISP) over them.
Yup, always run extra everything. At least you can splice fiber now. And be careful of the minimum bend radius. Once, in the 90s, we were having intermittent network failures in our data center. I kept trying to troubleshoot it with the fluke, but the problem kept moving. When I pulled up the raised floor, I discovered that rats were eating the exterior sheath of the network cables. That was some fun troubleshooting!
Fun fact 1: When you don't have a proper OTDR fiber tester to check for breaks, you can shine a laser pointer down the fiber and see it projected out on a sheet of paper on the other end (you might have to call the person on the other end).
Fun fact 2: If the other end is plugged into a transceiver, don't look at the fiber end directly; instead, look at it through your phone camera. If all is working correctly, you should be able to see a faint purple light out of one of the strands.
P.S. always remember to roll it if no link initially :)
Earlier quoted context omitted.
Not quite tiny - a basic armored (rats !) 12 strands cable may be around 10-15 millimeters, whereas similarly specced cables in the 500 strands range might reach 20-30 mm. In crowded Paris downtown, it adds up fast. On the countryside, that is a lot more weight to hang on poles.
> Paris downtown Where is downtown Paris? 1/2/3 arrondissement? I never heard the term used for Paris. Mostly, it is used to describe the Wall Street area of Manhattan (NYC) as the island is relatively north-south and Wall Street is on the southern end.
Earlier quoted context omitted.
> Yup, always run extra everything Cables ain't free, duct capacity is finite and duct rental from the local incumbent is costly too... Please calculate the financial optimum of pay now vs. pay later - taking into account growth, various forms of attrition, cost of capital, opportunity costs and appetite for risk. Or everyone would be running 1152 strands cables everywhere. But then I see that from a telco perspectiv…
And while some people preach hard-wired everything I’d probably increasingly not bother at home. . I’ll have to see how much networking and audio stuff I even do given a kitchen fire with s
I just had this experience. I had a 200ft run between my house and barn. The original builder put a direct bury ethernet between the two and it failed. I dug a trench, put in a conduit, pulled 2 fibre lines and left a pull string in. I recently had the primary fibre fail and am now on the backup. If I need to pull new ones in the future I can do that pretty easily through the conduit.
> I recently had the primary fibre fail
Regarding single mode vs multi-mode ... other than cost, is there any reason at all to run multi-mode fiber in 2025? I was under the impression that single mode was better in basically every way.
Cost, and marginally, heat of the transceivers.
> heat of the transceivers
Yup, always run extra everything. At least you can splice fiber now. And be careful of the minimum bend radius. Once, in the 90s, we were having intermittent network failures in our data center. I kept trying to troubleshoot it with the fluke, but the problem kept moving. When I pulled up the raised floor, I discovered that rats were eating the exterior sheath of the network cables. That was some fun troubleshooting!
"And be careful of the minimum bend radius." The minimum bend radius of any good fiber is way less than cat6 at this point. G.657A1/B1 = 10mm G.657A2/B2 = 7.5mm G.657A3/B3= 2.5mm CAT6 = 25mm Flexible cat6 = 15mm. Fiber surpassed copper for flexibility almost 2 decades ago (G.657 was introduced in 2006, but let's call it 5 years before all forms became common). Even G.652 was only 25mm and standardized in 1984.