Re: [foxboro] 1000Base-LX/LH; 2 km (6,560 ft) maximum (MMF)
- From: "tjvandew@xxxxxxxxx" <tjvandew@xxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Wed, 28 Jan 2009 18:08:56 -1000
We are also using MMF for this at Tesoro in Hawaii. Our longest run is
0.855km but we have not had problems.
Tom VandeWater
Control Conversions, Inc.
Kapolei, HI
Fitzgerrell, Kevin wrote:
> Andreas,
>
> Yes, I'm using these without problems. My longest runs are less than 2km,
> but I do have one about 1.2km.
>
> The Enterasys part number is MGBIC-LC03, Foxboro part P0972YQ. In their spec
> sheet they support on multimode fiber cable segments up to 2km, but they note
> the following:
>
> The maximum drive distance (up to 2 km) depends on the quality of the
> installed multimode fiber-optic cable segment. Use the Link Power Budget to
> calculate the maximum cable length of the attached segment. The Link Power
> Budget must not exceed those specified in this table. The MGBIC-LC03 input
> power must not exceed -3 dBm. Otherwise, saturation could occur.
>
> Their spec sheet says:
> Features Optical Specifications
> -------------------------------------------------------------------------
> Supports multimode fiber-optic Cable Type 50/125 or 62.5/125 μm MMF
> cable segments up to 2 km Maximum Input Power -3 dBm
> 1310 nm wavelength Transmit Power
> -9.5 dBm, minimum
> -3 dBm, maximum
> LC duplex style FO connector Receive Sensitivity
> -20 dBm, minimum
> -3 dBm, maximum
> Multimode only Link Power Budget
> 10.5 dB, minimum
> These specifications meet or exceed IEEE 802.3z 1000BASE-SX requirements.
>
> Regards,
>
> Kevin FitzGerrell
>
> -----Original Message-----
> From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
> Behalf Of Toecker, Michael
> Sent: Thursday, January 29, 2009 2:14 AM
> To: foxboro@xxxxxxxxxxxxx
> Subject: Re: [foxboro] 1000Base-LX/LH; 2 km (6,560 ft) maximum (MMF)
>
> Andreas,
>
> I noticed nobody has replied. I haven't used the GBIC in the situation
> you referenced, but I am familiar with fiber optic cabling and its
> limitations.
>
> Multi mode fiber is limited by spec to 550-600 meters for Gigabit
> speeds. If it works at all, you'll likely only get 100 MBit/s out of it
> (which might work for your needs). Of course, you might have a set of
> transceivers and fiber that exceeds spec, but likely not out to 2 km.
>
> I haven't found any documentation that suggests Enterasys (I'm assuming
> you are using these GBICs) guarantees Gigabit speeds for anything over
> 550 m for MMF.
>
> You'll likely need a mode conditioning cable as well, which will help
> with increasing the distance. Anything over 275-300 meters normally
> needs one. You may also need some special equipment to troubleshoot,
> you can't see the light from a single mode transmitter without a scope.
>
> Good luck,
>
> Michael Toecker
>
> -----Original Message-----
> From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
> On Behalf Of Weiss, Andreas
> Sent: Wednesday, January 28, 2009 9:27 AM
> To: foxboro@xxxxxxxxxxxxx
> Subject: [foxboro] 1000Base-LX/LH; 2 km (6,560 ft) maximum (MMF)
>
> Hi,
>
> has anyone used GBIC 1000Base-LX/LH; 2 km (6,560 ft) maximum (MMF) with
> multimode cable?
>
> Were there any problems?
>
> Regards,
> Andreas
>
>
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> Systems (formerly The Foxboro Company). Use the info you obtain here at
> your own risks. Read http://www.thecassandraproject.org/disclaimer.html
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> _______________________________________________________________________
> This mailing list is neither sponsored nor endorsed by Invensys Process
> Systems (formerly The Foxboro Company). Use the info you obtain here at
> your own risks. Read http://www.thecassandraproject.org/disclaimer.html
>
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>
_______________________________________________________________________
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Systems (formerly The Foxboro Company). Use the info you obtain here at
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