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 ...
Zac67's user avatar
  • 84.4k
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 ...
Zac67's user avatar
  • 84.4k
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 ...
Jeff Wheeler's user avatar
  • 5,469
14 votes
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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) ...
Ron Maupin's user avatar
  • 99.6k
12 votes
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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 ...
Zac67's user avatar
  • 84.4k
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 ...
Ron Maupin's user avatar
  • 99.6k
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 ...
Ron Maupin's user avatar
  • 99.6k
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 ...
Teun Vink's user avatar
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10 votes
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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 ...
Cow's user avatar
  • 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 ...
kaya atabey's user avatar
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 ...
Zac67's user avatar
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8 votes
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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 ...
YLearn's user avatar
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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 ...
Ron Trunk's user avatar
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8 votes
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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?
Gospot Bog's user avatar
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.
JFL's user avatar
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7 votes
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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 ...
Zac67's user avatar
  • 84.4k
7 votes
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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 ...
Zac67's user avatar
  • 84.4k
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: ...
Cow's user avatar
  • 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 ...
Zac67's user avatar
  • 84.4k
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 (...
Zac67's user avatar
  • 84.4k
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.
Ron Maupin's user avatar
  • 99.6k
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 ...
Zac67's user avatar
  • 84.4k
6 votes
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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 ...
Teun Vink's user avatar
  • 17.3k
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 ...
Mark Twain's user avatar
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 ...
Ecnerwal's user avatar
  • 2,746
6 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). The only exceptions are 2.5G and 5GBASE-T where the maximum ...
Zac67's user avatar
  • 84.4k
6 votes
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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 ...
Ron Maupin's user avatar
  • 99.6k
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 ...
JFL's user avatar
  • 19.6k
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 ...
Ricky's user avatar
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