[AusNOG] Basic question about fibre visual fault locators

[Mark Foster]

Single Mode has a very, very narrow light-path (6u) as opposed to Multi-Mode
(50u).

They’re not compatible with eachother – I’ve never used a VFL but I used to
work on campus fibre (MMF OM1, OM2, and OM3, and SMF SM1) routinely.

When I didn’t have the connectors I needed, a short patch lead usually did
the trick.

Can you use a short patch lead that’ll get you over to your required
interface?

MMF Patchleads are usually fairly readily available in various endpoint
combinations, as are SC-SC female-to-female (line joiners) and usually,
LC-LC versions of the same (which are just for plug alignment, and aren’t
type-specific.)

(Colours are specified by the standards but that’s all).

 

Mark.

 

 

 

From: AusNOG <ausnog-bounces at lists.ausnog.net> On Behalf Of Rhys Hanrahan
Sent: Friday, 25 September 2020 8:26 pm
To: ausnog at lists.ausnog.net
Subject: [AusNOG] Basic question about fibre visual fault locators

 

Hi Everyone!

 

I have a pretty basic question about VFLs. I haven’t used one before but we
need to trace some existing old MMF at a site and am about to buy a cheap
VFL that has a universal connector for SC, ST, FC. We need LC as all the
patch leads convert to this.  But all the LC female to SC male connectors I
can see around are either SMF, significantly more expensive or
internationally shipped. Need to get my hands on this for next week. 

 

I understand that in normal circumstances that mixing MMF and SMF spec
equipment would be a no go, but would it be sufficient to use a SMF adaptor
just for the purposes of fault-finding/tracing in this case?

 

I was looking at an adaptor like this one, coupled with a separate cheap
VFL:
https://www.ebay.com.au/itm/SC-Male-to-LC-Female-Single-Mode-Fiber-Optic-Hyb
rid-Optical-Adaptor-Converter/353200623750

 

This “looks” like it is the same adaptor all the VFLs are bundling in with
the tool anyway (but they are all being shipped internationally). Is there
any reason not to settle for this? Thanks!


Rhys Hanrahan
Chief Information Officer
Nexus One Pty Ltd


E: support at nexusone.com.au <mailto:support at nexusone.com.au> 
P: +61 2 9191 0606
W: http://www.nexusone.com.au/
M: PO Box A356 Sydney South, NSW 1235
A: Level 12 227 Elizabeth St, Sydney NSW 2000



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