[AusNOG] fortimail Re: MMF fiber OM3 cabling versus OM1 patch leads

[Christopher Mclean]

Mismatched leads will give you reflections and losses. OM1 to OM3 will work and generally do not cause too many problems. I would be looking to use all OM3 from this point (i'm sure that would have been your plan anyway) as you need to replace them but also look at those critical connections and maybe work through a plan to replace those first. The longer lengths will be the most effected by losses where a little dirt on the fibre will bring it down. Reflections if they are big enough can damage optics.

Best regards,
Chris McLean
Senior Sales Engineer
Ausoptic International
0431733557

________________________________
From: AusNOG [ausnog-bounces at lists.ausnog.net] on behalf of Mark Foster [blakjak at blakjak.net]
Sent: Friday, 28 March 2014 11:24 AM
To: Qui Le; ausnog at lists.ausnog.net >> "ausnog at lists.ausnog.net"
Subject: fortimail Re: [AusNOG] MMF fiber OM3 cabling versus OM1 patch leads


Your OM1 patch leads have a 62.5 micron core, connected to an OM3 50 micron core.  So you are probably seeing a small amount of loss - but perhaps it's so small it's negligable. In particular I suppose the transmit side being smaller than the receive side, is likely to be 'doable' with minimal losses.

I would certainly ensure you have the same type of fibre end-to-end to ensure reliable service; do it as part of a planned outage now, before it becomes an unplanned outage later when someone 'nudges' a cable and ruins things ... !

Mark.



On 27/03/2014 4:57 p.m., Qui Le wrote:
Hi

Our Data centre built several years ago using multimode to be compatibility with existing MMF infrastructure.

Recently we have an electrician audit report that our fibre cabling between our inter-racks are MMF OM3 but the patch leads we use are OM1.

We are not sure if this cause performance issues or data loss but we cannot see any errors in our fiber switches or in our Cores.

Is it worthwhile to replace these fiber Patch leads to OM3 ?

Any advice is much appreciated.

Qui Le


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