Re: [foxboro] 1000Base-LX/LH; 2 km (6,560 ft) maximum (MMF)

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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_______________________________________________________________________
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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_______________________________________________________________________
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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