[AusNOG] Fiber connectivity

[Darren Ward (darrward)]

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
(darrward)
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
points?

 

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

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/product_bullet
in_c25-530836.html 

 

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?

 

Darren

 

 

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.

 

Thanks

 

Qui Le


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