|
Posted by Will on June 30, 2007, 12:28 am
If you were Registered and logged in, you could reply and use other advanced thread options
Is there more than one standard for passing 100 Base ethernet over fiber?
I have a media converter that says it will convert from 100Base-T to
100Base-FX at 850nm. The device I need to plug this to (a DWDM system)
has a tributary that supports FX-100. It's not clear to me if these are
identical, or if there might be more than one standard for support of fiber
optic 100 Megabit ethernet.
--
Will
|
 
| |
Posted by Walter Roberson on June 30, 2007, 1:12 am
If you were Registered and logged in, you could reply and use other advanced thread options
>Is there more than one standard for passing 100 Base ethernet over fiber?
>I have a media converter that says it will convert from 100Base-T to
>100Base-FX at 850nm.
Yes, there is -SX, -LX, -SZ; some add -LH as distinct from -LX
(but they are often implemented together.) Then there are the wave
division varieties.
SX is usually multimode only.
LX ... I haven't looked it up for awhile, but I seem to recall LX can
be over multimode or single mode.
SZ is single mode.
There are different fibre sizes permitted, and different fibre
qualities involved, and the frequencies can differ, and the
combination of frequency, quality, and fibre size determines the
maximum distance.
|
|
Posted by Daniel J McDonald on June 30, 2007, 7:13 pm
If you were Registered and logged in, you could reply and use other advanced thread options
>Is there more than one standard for passing 100 Base ethernet over fiber?
>I have a media converter that says it will convert from 100Base-T to
>100Base-FX at 850nm. The device I need to plug this to (a DWDM system)
>has a tributary that supports FX-100.
100BaseFX is 1310nm.
> It's not clear to me if these are
>identical, or if there might be more than one standard for support of fiber
>optic 100 Megabit ethernet.
There is only one "standard", but lots of non-interoperable 1.2 Mbaud
transceivers out there.
For Gigabit, there are a plethora of standards (SX, LX, LH, ZX) and plenty
of custom implementations (e.g Cisco's CWDM GBICs, or Champion's
extra-long reach GBICs). But, as far as I know, the only official
standard for 100mb is 1310nm coded as 4B/5B on a 1.2MBAUD carrier.
Back in 10BaseF days, there were three standards plus one pre-standard:
FOIRL was pre-standard (championed by Digital), 10BaseFL was the
mainstream varient (850nm, Manchester encoded), 10BaseFB was widely
available (both Synoptics and ... Sorry, can't think of the big 10BaseFB
pusher). I think it was also 850nm, but it had some sort of syncronous
clock instead of Manchester. Then there was Codenal with their truly
bizarre 10BaseFP variant. It used much "hotter" LED's and passive hubs
which were made of fiber with the insulation stripped off and wound
tightly together. The idea was a half-duplex passive star where all of
the stations would see the signal bleeding across pairs.
--
Daniel J McDonald CCIE # 2495, CNX
Visit my website: http://www.austinnetworkdesign.com
|
|
Posted by Walter Roberson on June 30, 2007, 9:31 pm
If you were Registered and logged in, you could reply and use other advanced thread options
>But, as far as I know, the only official
>standard for 100mb is 1310nm coded as 4B/5B on a 1.2MBAUD carrier.
How about
ITU-T G.651 MMF 50 micron, optimized for 1300-nm band, optional
use at 850-nm
http://www.itu.int/rec/T-REC-G.651-199802-I/en
|
|
Posted by Daniel J McDonald on June 30, 2007, 9:55 pm
If you were Registered and logged in, you could reply and use other advanced thread options
>>But, as far as I know, the only official
>>standard for 100mb is 1310nm coded as 4B/5B on a 1.2MBAUD carrier.
>
>How about
>
>ITU-T G.651 MMF 50 micron, optimized for 1300-nm band, optional
>use at 850-nm
That merely describes the fiber, and says that it is ideal for 1310nm
communications (like FDDI, 100BaseFX, and 1000BaseLX) but also works fine
for 850nm applications (such as FOIRL, 10BaseFL, 10BaseFB, and 1000BaseSX)
It does not describe a PHY that can be used to transmit 120MBAUD at 850nm.
> >http://www.itu.int/rec/T-REC-G.651-199802-I/en
>
>
--
Daniel J McDonald CCIE # 2495, CNX
Visit my website: http://www.austinnetworkdesign.com
|
| Similar Threads | Posted | | Supply Mini-Com Coupler Modules ,Mini-com Coupler Modules,Panduit Mini-com Coupler Module,Panduit Minicom Modules,Panduit Mini-Com Module,Panduit Mini-com Fiber Optic Adapter Modules | April 23, 2006, 9:49 am |
| Maximum maximum packets per second on 10 megabit ethernet ? 1.250.000 / 1538 = 812,743823 ??? | February 19, 2005, 8:31 am |
| ADC FL1000 Wall-Mount Boxes,ADC Wall-Mounted Fiber Distribution Boxes,Wall-Mounted Fiber Distribution Panels,ADC Wall Mounted Fiber Termination Panels | March 7, 2006, 9:06 pm |
| standard for auto-negotiation | May 24, 2007, 12:57 pm |
| Crossover function in the standard. | June 23, 2008, 4:34 pm |
| Can a standard NIC be triggered to send an electrical signal? | August 30, 2005, 8:28 am |
| 10 megabit half duplex causes lots of collisions? | February 21, 2006, 2:02 pm |
| Is there anybody here having IEEE's DSRC/WAVE 1609 standard documents? | February 20, 2008, 8:55 am |
| Fiber vs cat6 | December 23, 2007, 5:12 pm |
| LAN extenders as alternative to Fiber | February 1, 2006, 5:17 am |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML site map