25
votes
Accepted
What is this device used by a networking technology company?
Connecting two fiber trunks is a tedious process. Those are splice cassettes for optical fiber - each single fiber is fusion spliced and looped into one of the cassettes for protection. Afterwards the ...
- 88.1k
17
votes
Accepted
What do the positive and negative (+/-) transmit and receive pins mean on Ethernet cables?
Twisted pair uses differential signaling - in a pair, one wire is always the negative/complimentary signal of the other. In the simplest example, Transmit+ > Transmit- (higher voltage level) means 1 ...
- 88.1k
17
votes
What is this device used by a networking technology company?
They're a fiber splicing crew. The white plastic trays are used to organize fiber connections.
A waterproof enclosure will protect the whole assembly from debris when their job is finished, and the ...
- 5,606
14
votes
Accepted
The maximum length of CAT6 for intranet network?
Per the ANSI/TIA/EIA 568, Commercial Building Telecommunication Standard, UTP cabling is limited to 100 meters. That length assumes up to 90 meters of solid-core (better performance, but fragile) ...
- 101k
12
votes
Accepted
Do I need to protect SFP ports and optics from dust/contaminants? If so, how?
Do I need to protect the physical empty SFP port? What's a good way to do so?
Empty SFP slots should be covered when not in use, so no dust is sucked up by the system fan - depending on how dusty the ...
- 88.1k
10
votes
Accepted
Appropriate certificate to ask for a fibre installation (ANSI/TIA-568.3-D?)
ANSI/TIA-568.3-D is the appropriate and up-to-date standard for fiber installations. You should ask your contractor to comply with these guidelines.
When we hire a subcontractor, we always ask for ...
- 1,742
10
votes
Fiber between two sites - no signal lights
OM1 or OM3 makes a lot of difference. Please check https://en.wikipedia.org/wiki/Multi-mode_optical_fiber . You will see that OM1 cable can carry 10G for 33 meters while OM3 can carry it for 300 ...
- 365
9
votes
Fiber between two sites - no signal lights
300m of OM1 will NOT work with 10GBASE-SR, as JFL and kaya atabey have already pointed out. From 2003, it's quite likely OM2 which won't work with 10G-SR either at that distance. Additionally, patch ...
- 88.1k
8
votes
Accepted
Cables on a closed rack
My question is: is it such a big deal to put cabling into a closed rack?
No. It can make working on the cabling more difficult and add time (i.e. labor costs) to the work, but I have seen this done ...
- 27.4k
8
votes
Speed benefits when switching LAN from 1Gb copper to Fiber Optic
You are conflating many things here, so let's try to detangle the issues in your question.
Data rate is data rate, regardless of the physical medium. A 1Gb
connection has the same data rate whether ...
- 68k
8
votes
Accepted
SC to LC converter - performance penalty?
The light levels will decrease (0.3 - 0.5)dBm in best case scenario. Why aren't you using direct SC to LC patch cord without the adapter?
- 110
8
votes
Accepted
Can Ethernet use fiber optic cables?
Ethernet uses a variety of cable types - an Ethernet cable can be pretty much anything. Ethernet has been using optical fiber for decades. The first standard was 10 Mbit/s FOIRL in 1987, the currently ...
- 88.1k
8
votes
Fiber between two sites - no signal lights
From the J9150D datasheet you linked, the max transmission distance over an OM1 fiber is 33m.
Thus you need other transceivers, or to change the fiber.
- 19.8k
7
votes
The maximum length of CAT6 for intranet network?
For twisted-pair Ethernet, maximum cable length is 100 m (Cat-6A for 10GBASE-T, Cat-5e for 1000BASE-T or 100BASE-TX, Cat-3 for 10BASE-T) - up to 90 m stiff, solid-core and up to 10 m stranded patch ...
- 88.1k
7
votes
Accepted
Why is there a separate set of 10 Gigabit fiber-optic transmission standards for WANs/SONET?
From IEEE 802.3 Clause 50.1: (emphasis mine)
The WAN Interface Sublayer (WIS) is an optional PHY sublayer that may
be used to create a 10GBASE-W PHY that is data-rate and format
compatible with the ...
- 88.1k
7
votes
Do I need to protect SFP ports and optics from dust/contaminants? If so, how?
Cisco writes the following about the dust caps:
For optical SFP transceiver modules, before removing the dust plugs
and making any optical connections, observe the following guidelines:
...
- 1,742
7
votes
Accepted
Will OM4 Fiber Work with my 1GbE Fiber Transceiver?
As per IEEE 802.3 Clause 38, 1000BASE-SX requires OM2 (500 MHz·km for 850 nm) for max. 550 m reach. As a superset, OM4 is fine as well (there's little point buying OM2). With 10GBASE-SR the reach over ...
- 88.1k
7
votes
Accepted
Are LC-UPC connectors compatible with LC-PC?
Yes.
PC, SPC and UPC are just different polish grades of perpendicular, physical contact connectors. Their end-faces match, so they work nicely together.
In contrast, APC uses an angled surface (...
- 88.1k
7
votes
Accepted
What type of fiber optic cable and termination should be used for temporary outdoor connectivity at an event (UPC vs APC)?
If you have a way to keep the fiber protected/safe from feet and other dangers, it should be fine to use a simple pre-made patch cable. Personally, I would order 2 just in case of an issue with the ...
- 2,594
6
votes
Speed of Light in Copper VS Fiber - Why is Fiber Better?
The propagation speed is often expressed as the velocity factor of a medium - the fraction of the speed of light in vacuum that you get.
On the physical side, light going through a medium is slowed by ...
- 88.1k
6
votes
Accepted
Building too large for ethernet runs
Fiber is not so expensive unless you are getting fleeced. Indeed, it can be cheaper than copper cabling. It's also the right solution to long runs.
Given the installation costs, it's likewise foolish ...
- 2,746
6
votes
Accepted
Reasons not to combine daisy chaining with path redundancy
I'm not sure I completely understand your question (the document does have a combination of path redundancy and daisy-chain), but I can explain the problem with daisy-chains.
Normally, you want path ...
- 101k
6
votes
Are there any advantages in using optic fiber to connect a host computer to an Ethernet LAN?
There's several advantages to Fiber-to-the-desk
length: copper cabling is limited to 90 meters of horizontal cabling (leaving 10 meters for patching). Fiber doesn't have this limitation. In some ...
- 19.8k
6
votes
Accepted
Better throughput with 100 Mb NIC setting
This is a buffering issue. I had the same problem with a new Level 3 circuit. Their NID apparently has no measurable buffers, so feeding it at a rate 10x the circuit rate (1000 vs. 100) leads to all ...
- 32.6k
6
votes
Accepted
LACP and how to configure switches correctly
Your ethernet SFP/SFP+ for fiber are going to be 1 or 10 Gbps. There isn't a 2 Gbps ethernet fiber SFP (some vendors used to count this way because of full duplex, but it is still 1 Gbps in each ...
- 101k
6
votes
Accepted
Fiber to copper conversion, what are the odds?
Fiber media converter is a small device with two media-dependent interfaces and a power supply, simply receive data signals from one media, convert and transmit them to another media. It can be ...
- 1,742
6
votes
Accepted
new SFP network for newbies
SFP is a standard for modular network ports. Essentially, the empty SFP slot is "PHY-less" until you plug in a module - with an Ethernet SFP port, you can plug in a 1000BASE-T module for twisted pair, ...
- 88.1k
6
votes
Accepted
How can a server from US connect to a tier 1 ISP?
Is there fibers over the ocean ?
They're more under the Ocean but absolutely, you can see a somewhat accurate map of them here. These undersea cables are how continents are interconnected and will ...
- 1,317
Only top scored, non community-wiki answers of a minimum length are eligible