Can anyone tell me how to determine if an ethernet cable is fiber optic? If one is fiber optic, is there no connection between the two ends besides the insulation and the fiber?
Look at the connections at the end, a fiber optic cable will have a single 'plug' per strand while a wire cable will have a single plug aka rj connection for all the wires.
Its possible to join two fiber optic cables, so there can be a connection between the two ends.
Regards, Xeclipse.
If it has a fibre inside then its a fibre optic cable. If it has copper inside then its a copper cable.
Copper ethernet cables will either have BNC (coaxial) or 'RJ45' (UTP) connectors. Older 'thick' ethernet will have N connectors.
Copper ethernet cables will either have BNC (coaxial) or 'RJ45' (UTP) connectors. Older 'thick' ethernet will have N connectors.
I'd like to isolate the ethernet connection between two computers. Should I use two of these with one in front of the ethernet port on either computer and a fiber optic ethernet cable in-between:
Amazon.com: TRENDnet 100/1000Base-T to SFP Media Converter (TFC-1000MGA): Computers & Accessories
With a 25-foot fiber optic cable, should this increase or decrease latency compared to running a crossover cable directly between the computers?
Amazon.com: TRENDnet 100/1000Base-T to SFP Media Converter (TFC-1000MGA): Computers & Accessories
With a 25-foot fiber optic cable, should this increase or decrease latency compared to running a crossover cable directly between the computers?
It looks like there may actually be a "metal armor" connection between each end?
The unit you show linked above will still require mini-GBIC modules for the fiber interface.
You will need a unit such as this: http://www.amazon.com/StarTech-com-...d=1346163695&sr=1-2&keywords=medias+converter
If you don't need 1000BASE-T there are less expensive 100BASE-T units. Look for multi-mode units with the type SC multi-mode fiber connector. You will not need single-mode fiber for short distances.
There will be no latency issues.
Scott
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All copper Ethernet is transformer isolated. You will not generate ground loops or any similar issue using an ethernet cable (although some CAT6 cables are shielded and might create a ground loop. Use an unshielded cable).
Did you realize that the media converters you pointed to do not include the laser module? You need to buy and install the laser module appropriate for the distance you want to cover and the type of fiber you will use.
Did you realize that the media converters you pointed to do not include the laser module? You need to buy and install the laser module appropriate for the distance you want to cover and the type of fiber you will use.
The CAt 6 shield is not used as a ground connection, the signals are LVDS and provided the ethernet layout is done correctly (which it should as it is one of the most documented interfaces forlayout, and has to be when you consider how you can plug any equipement into an thernet modular connector and it will work) you should not create a ground loop even with CAT 6 cable, but as there are not many full gigabit ethernet instalations as Macboy said use CAT 5 and there are no worries.
Fibre is a bit of overkill for homeuse, cable is good enough.
Fibre is a bit of overkill for homeuse, cable is good enough.
I'm trying to prevent the EMI generated by one computer from being conducted to a second computer connected via ethernet. Would any ethernet cable provide this sort of isolation? I would have thought a copper connection between the computers would provide a pathway for EMI.marce said:
Look up the ethernet interface, it is designed so that you can plug any ethernet device into it, so is designed to been designigned as an isolated interface. Curious as to what EMI you are refering to, as all electronic devices are tested to pass CE and FCC in regards to elecromagnetic compatability.
ggking7, are you actually HAVING problems with EMI, or are you just being too influenced by audiophile press which promotes it as something evil to be feared and eradicated at all costs (along with promoting various high dollar contraptions to reduce it)? i've just noticed its a theme in a number of your posts/queries lately
I've been having problems with EMI for years. It must be eradicated, yes, but I've come to that conclusion through personal experience. I hope that's OK. The latest example is that the Sony PCM-M10 I just got sounds worlds better than my computer and Wavelength Proton USB DAC when either are connected to the same amp and speakers. I think this is due to the EMI conducted from the computer to the DAC.qusp said:
Anyway, I hope I don't offend anyone by experimenting with this.
Does anyone know of a unit like this with 5VDC input so I can power it with a supply I have?scott17 said:
It may not be the computer,it may be the DAC. Have you isolated the EMI and measured it or is it based on perception?
no offense taken, i've just noticed that not just in your posts, that EMI is the latest buzzword, when it can be as simple as bad grounding practices
Playing about with grounding is usualy how problems are solved when you are testing kit in an EMC lab. All products sold should be EMC complient, and for commercial products in the EU it is quite a stringent requirement. One of the causes of EMC problems in diy products (Audio) is over exuberant star grounding. Here is someinteresting reading, the first two articles being the most relevant:
Tony Waldron's EMC ranting and ravings
Tony Waldron's EMC ranting and ravings
This is based on perception only. The USB-powered Wavelength Proton DAC is really well-regarded and it takes a big step up in sound quality whenever I find a way to reduce EMI from the computer.marce said:
Galvanic isolation strikes me as preferable to any other method which minimizes the effects of EMI. Please correct me if I'm wrong.marce said:
How does this look:
Ethernet To Fiber Optic Converter / Converters - MM
It's multi-mode, SC connector, 100BASE-T, and 5VDC.
Hi Marc,
Just had a (very quick) look at the first three articles your link indexes - I have to say they look excellent.
They'll be light relief for me in a day or two, once I've finished repairing an incinerated pcb from a mixing desk psu. The owner noticed that the cooling fan had packed in, but kept going regardless. It took a week to die, don't know how he could put up with the smell.....I wake up in a cold sweat with the odour of electrical fire in my nostrils....🙄
Hi Simon,
its an interesting article, as are most on EMC and EMC problems cos by its nature, when you get a problem its because your carefully thought out grounding scheme hasn't accounted for some stray path.
Hows life, I've been down Harrow for 9 weeks now at Esterlines Headset place, having fun.
its an interesting article, as are most on EMC and EMC problems cos by its nature, when you get a problem its because your carefully thought out grounding scheme hasn't accounted for some stray path.
Hows life, I've been down Harrow for 9 weeks now at Esterlines Headset place, having fun.
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