More Than One Fiber Optic 100 Megabit Ethernet Standard?
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Posted by Will on June 30, 2007, 12:28 am
Please log in for more 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 | ||||||||||||||||||||||||||||
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Posted by Walter Roberson on June 30, 2007, 1:12 am
Please log in for more thread options 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. | ||||||||||||||||||||||||||||
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Posted by Daniel J McDonald on June 30, 2007, 7:13 pm
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>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 | ||||||||||||||||||||||||||||
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Posted by Walter Roberson on June 30, 2007, 9:31 pm
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>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 | ||||||||||||||||||||||||||||
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Posted by Daniel J McDonald on June 30, 2007, 9:55 pm
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>>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 | ||||||||||||||||||||||||||||
>I have a media converter that says it will convert from 100Base-T to
>100Base-FX at 850nm.