[AusNOG] Fiber connectivity

Darren Ward (darrward) darrward at cisco.com
Fri Apr 20 11:12:15 EST 2012

That came out wrong...


I meant to say actual power available from a LH/LX SFP is definitely
good enough but have concerns over the possible lack of mode
conditioning plus potentially a lot of loss through patch panels and
badly looped fibre patch leads


From: ausnog-bounces at lists.ausnog.net
[mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Darren Ward
Sent: Friday, 20 April 2012 10:58 AM
To: Qui Le; ausnog at lists.ausnog.net
Subject: Re: [AusNOG] Fiber connectivity


Since you are running a single mode SFP on Multimode fibre a first
question is whether you are using mode conditioning cables at the end


I've included a vendor link here, please don't shoot me J but it
specifically discusses the issue



Since a LH/LX has a decent amount of dB power budget available before
errors creep in I'd assume this combined with a large number of
reflective surfaces (6 pairs of patch panels with patch leads is 20 - 40
reflective surfaces alone) and the vaguaries of badly looped fibre
patches could mean total end to end loss is huge


I don't suppose you have access to a basic optical power meter?





From: ausnog-bounces at lists.ausnog.net
[mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Qui Le
Sent: Friday, 20 April 2012 10:45 AM
To: ausnog at lists.ausnog.net
Subject: [AusNOG] Fiber connectivity


We run 550m of OM1 fibre from our Cisco core to a remote site over 6
hops included rack to rack and we can not

seem  to get any connectivity. Using both Cisco GLC-LH-SM transceivers
at both the Core & access Switch.


Does anyone know if there are hops limitations for long haul fibres.


Any advise is much appreciated.




Qui Le

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