[AusNOG] MMF fiber OM3 cabling versus OM1 patch leads

[Beeson, Ayden]

If your optic supports it, check the DOM information, I guarantee your loss margins are higher than they should be, though likely still well within tolerable margins given the distance you are running it.

Unless you are running higher distance lengths you would be surprised how tolerant they can be, though it's not necessarily good for the optics either...

Mark is definitely spot on, get it fixed when you are able to plan it before it becomes a problem!

Thanks,
Ayden Beeson

From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Mark Foster
Sent: Thursday, 27 March 2014 4:32 PM
To: Qui Le; ausnog at lists.ausnog.net >> "ausnog at lists.ausnog.net"
Subject: 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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