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 ...
- 82.6k
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 ...
- 82.6k
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 ...
- 5,449
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) ...
- 98.7k
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 ...
- 82.6k
11
votes
Can a single optical fiber support full-duplex communication?
Can a single optical fiber support full-duplex communication?
Yes. There are "BX" standards, e.g. 100BASE-BX, which use different wavelengths for send and receive. The transmit wavelength on one end ...
- 98.7k
10
votes
Where to cross RX/TX line in fibre optical cabling
This is directly addressed by the ANSI/TIA/EIA 568-B Commercial Building Telecommunications Cabling Standard:
Connecting Hardware and Polarity
Optical fiber shall be installed with odd ...
- 98.7k
10
votes
What does "10Gbps wave connection" mean?
Most likely they mean a wavelength on a DWDM path. With DWDM, a fiber operator can use one single pair of fibers to carry a number of different colors (wavelengths) of light using multiplexing. Each ...
- 17.1k
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 ...
- 1,732
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 ...
- 335
9
votes
Is fiber optic Digital or analog? optical signal is digital or analog?
Due to the way that fiber lasers work, common digital encoding on fiber is <20% is a 0 and >80% is a 1 so the beam is never "off" it just varies between low and high power. Turning the laser OFF is ...
- 2,746
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 ...
- 82.6k
8
votes
using fiberoptic for long-distance ethernet connection
Part 1: Using fiber to run a 1000 foot ethernet link
Using fiber to run a long ethernet link is not quite as simple as you make out but it's certainly not unreasonable to DIY.
A few things you have ...
- 13.2k
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 ...
- 27.2k
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 ...
- 67.1k
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
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.
- 19.5k
7
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 ...
- 82.6k
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 ...
- 82.6k
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:
...
- 1,732
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 ...
- 82.6k
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 (...
- 82.6k
6
votes
Is fiber optic Digital or analog? optical signal is digital or analog?
All signals are analog, wether if it's electricity (copper), light (fiber) or radio (wifi), signals/waves can have any arbitrary value. However, in the computer world they carry digital information (...
- 154
6
votes
Optics for long haul fiber
Single fiber and single wavelength are fundamentally incompatible. You either need two fibers (send at each end connected to receive at the other end) and one wavelength is fine, or you need two ...
- 2,746
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 ...
- 82.6k
6
votes
Are all same type fiber optic transceiver compatible?
1000BASE-LX is a standard the same way 1000BASE-T is. You expect any copper interfaces with 1000BASE-T to interoperate, and you should expect the same thing with fiber 1000BASE-LX interfaces.
- 98.7k
6
votes
Accepted
Fiber cable mixing single mode with multi mode
Yes, this absolutely is a problem. Don't ever mix different types of cabling. Multimode has a 50 or 62.5 micron core diameter, while single mode fiber typically has a 9 micron core. If you connect two ...
- 17.1k
6
votes
Can a single optical fiber support full-duplex communication?
A full duplex or Bidirection communication meaning that it can support both stations transmitting and receiving simultaneously.
To accomplish this, a single optical fiber with WDM technology is ...
- 334
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
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