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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