antivirus6613
@comcast.net
|  Fiber Types
I live in Plymouth township in MI. Most ISP's offer cable broadband internet. I was wondering if fiber is run to the main hub of the subdivision in most cases or if it is some type of RG coaxial cable ex. RG218.
And if fiber is run what is the best type of fiber to run and what is the type of fiber the ISP's run? |
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tschmidt
Premium,MVM
join:2000-11-12
Milford, NH
 ·Verizon Online DSL
| Impossible to tell. Who owns the fiber: Telco, Cable, third party? What service is being delivered over the fiber?
Sounds like you are describing Hybrid Fiber Coax (HFC) outside plant used by Cable operators. Typically fiber is run from head end to local node. The node converts optical signals to electrical. Combination of hard line and RG 6 coax connect individual customers to node. A Typical node supports several hundred customers.
/tom |
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antivirus6613
@comcast.net
| reply to antivirus6613
There is no fiber services in the area. Just broadband. What is the fastest type of fiber?
If you are wondering why I am asking here is my reasons. Project for school which requires writing to someone from township or city on an issue. I picked running fiber to every home. It looks like fiber is already ran however to the subdivision. I was going to write that they should upgrade their fiber with something else ( better type?) or something to make my reasoning correct. |
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LazMan
join:2003-03-26
Angus, ON
·Bell Sympatico
 ·Rogers Hi-Speed
| Fastest type of fibre? Dunno - they all pretty much sit still.
Sorry - probably not that funny... 
Anyways - 40 Gbps (OC-768) is the fastest system in place right now, and multiple OC-768 wavelengths can be combined on a single fibre (upto about 16, currently, I believe)
That's backbone/long-haul equipment. For FTTH deployments, google GPON. That's the most common technology for FIOS-type deployments...
Laz |
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jchambers28
join:2007-05-12
Alma, AR
·Cox HSI
 ·magicjack.com
·Vonage
·Cox VOIP
 ·Sprint Mobile Broa..
edit:
May 2nd, @09:52PM
| reply to antivirus6613
there are 2 fiber types there is single mode and multi mode
Single Mode cable is a single strand (most applications use 2 fibers) of glass fiber with a diameter of 8.3 to 10 microns that has one mode of transmission. Single Mode Fiber with a relatively narrow diameter, through which only one mode will propagate typically 1310 or 1550nm. Carries higher bandwidth than multimode fiber, but requires a light source with a narrow spectral width. Synonyms mono-mode optical fiber, single-mode fiber, single-mode optical waveguide, uni-mode fiber.
Single Modem fiber is used in many applications where data is sent at multi-frequency (WDM Wave-Division-Multiplexing) so only one cable is needed - (single-mode on one single fiber)
Single-mode fiber gives you a higher transmission rate and up to 50 times more distance than multimode, but it also costs more. Single-mode fiber has a much smaller core than multimode. The small core and single light-wave virtually eliminate any distortion that could result from overlapping light pulses, providing the least signal attenuation and the highest transmission speeds of any fiber cable type.
Single-mode optical fiber is an optical fiber in which only the lowest order bound mode can propagate at the wavelength of interest typically 1300 to 1320nm.
Multi-Mode cable is what cable companies use and has a little bit bigger diameter, with a common diameters in the 50-to-100 micron range for the light carry component (in the US the most common size is 62.5um). Most applications in which Multi-mode fiber is used, 2 fibers are used (WDM is not normally used on multi-mode fiber). POF is a newer plastic-based cable which promises performance similar to glass cable on very short runs, but at a lower cost.
Multimode fiber gives you high bandwidth at high speeds (10 to 100MBS - Gigabit to 275m to 2km) over medium distances. Light waves are dispersed into numerous paths, or modes, as they travel through the cable's core typically 850 or 1300nm. Typical multimode fiber core diameters are 50, 62.5, and 100 micrometers. However, in long cable runs (greater than 3000 feet [914.4 meters), multiple paths of light can cause signal distortion at the receiving end, resulting in an unclear and incomplete data transmission so designers now call for single mode fiber in new applications using Gigabit and beyond.
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cob_
1310nm Of Goodness
Premium
join:2003-07-08
Tulsa, OK | reply to antivirus6613
Just for the sake of (sorely lacking on this forum) discussion, I'm thinking OC-768 won't be as prevalent as G.709 OTU3 over R/OADMs in the future. |
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antivirus6613
@comcast.net | reply to antivirus6613
Ok thank you very much. |
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Darth Fiber
Premium
join:2005-12-16
Pompton Lakes, NJ
| Jchambers was wrong about one major thing. Most cable companies use single mode fiber, not multimode fiber.
Multimode fiber is mainly used for intrafacility wiring, such as data storage centers and server rooms. Single mode fiber is used outside for it's long transmission distances. |
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BLUNTED 1
join:2003-11-13
Floral Park, NY | »en.wikipedia.org/wiki/OC-3#OC-3072 |
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tenpin784
I Went To The Dark Side?
join:2001-03-30
New Durham, NH
·Metrocast Communic..
edit:
June 19th, @01:36PM
| reply to Darth Fiber
said by Darth Fiber  :Jchambers was wrong about one major thing. Most cable companies use single mode fiber, not multimode fiber. Multimode fiber is mainly used for intrafacility wiring, such as data storage centers and server rooms. Single mode fiber is used outside for it's long transmission distances. I was going to say the same thing.
Multimode can only go so far, *maybe* a couple miles.
Single mode can go MUCH farther. At my work, we have single mode fiber spanning over 50 miles.
edit: one site says, for 100mbit link, distance is 2km, 1000mbit (1gig) is 500-600 meters. |
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