Re: [AFMUG] dumb OTDR question

[dmmoffett]

It’s a 1x2 PLC, and I wondered if it could have been an unterminated leg, but 
usually you get noise after a dead end whereas this trace continued on for a 
bit before hitting a definite dead end.

 

From: AF  On Behalf Of Trey Scarborough
Sent: Friday, September 29, 2023 3:20 PM
To: af@af.afmug.com
Subject: Re: [AFMUG] dumb OTDR question

 

Could be a bad splice, but if it is a splitter it could just be an artifact of 
that. It all depends on the type of splitter you are using and what wavelength 
the OTDR is. It also depends what is on the other ends of the splitter. If that 
is a splitter with nothing spliced to one of the ends you  can get a reflection 
off of a dead end.

On 9/28/23 8:32 AM, Adam Moffett wrote:

Can you have return loss (i.e. reflections) on bad fusion splices?

Attached trace is a splitter showing return loss.  It's supposed to be fusion 
spliced, not connectorized.  There are several of these on this project.  
Trying to figure out if contractor snuck in some incorrect parts or if he's got 
issues with his fusion splicer.  I'd assume it's bad splices, but maybe 
coincidentally the reflectance just happens to be about right for UPC 
connectors.





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Re: [AFMUG] dumb OTDR question

[Josh Luthman]

Oh whoops!

On Fri, Sep 29, 2023 at 3:46 PM Adam Moffett  wrote:

> It’s definitely a splitter
>
> Get Outlook for iOS 
> --
> *From:* AF  on behalf of Josh Luthman <
> j...@imaginenetworksllc.com>
> *Sent:* Friday, September 29, 2023 3:25:32 PM
> *To:* AnimalFarm Microwave Users Group 
> *Subject:* Re: [AFMUG] dumb OTDR question
>
> Probably not a splitter.  It gets very confused shooting past it (both our
> cheap China & the demo Veex).
>
> On Fri, Sep 29, 2023 at 3:24 PM Trey Scarborough  wrote:
>
> Could be a bad splice, but if it is a splitter it could just be an
> artifact of that. It all depends on the type of splitter you are using and
> what wavelength the OTDR is. It also depends what is on the other ends of
> the splitter. If that is a splitter with nothing spliced to one of the ends
> you  can get a reflection off of a dead end.
> On 9/28/23 8:32 AM, Adam Moffett wrote:
>
> Can you have return loss (i.e. reflections) on bad fusion splices?
>
> Attached trace is a splitter showing return loss.  It's supposed to be
> fusion spliced, not connectorized.  There are several of these on this
> project.  Trying to figure out if contractor snuck in some incorrect parts
> or if he's got issues with his fusion splicer.  I'd assume it's bad
> splices, but maybe coincidentally the reflectance just happens to be about
> right for UPC connectors.
>
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Re: [AFMUG] dumb OTDR question

[Adam Moffett]

It’s definitely a splitter

Get Outlook for iOS

From: AF  on behalf of Josh Luthman 

Sent: Friday, September 29, 2023 3:25:32 PM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] dumb OTDR question

Probably not a splitter.  It gets very confused shooting past it (both our 
cheap China & the demo Veex).

On Fri, Sep 29, 2023 at 3:24 PM Trey Scarborough 
mailto:t...@3dsc.co>> wrote:

Could be a bad splice, but if it is a splitter it could just be an artifact of 
that. It all depends on the type of splitter you are using and what wavelength 
the OTDR is. It also depends what is on the other ends of the splitter. If that 
is a splitter with nothing spliced to one of the ends you  can get a reflection 
off of a dead end.

On 9/28/23 8:32 AM, Adam Moffett wrote:
Can you have return loss (i.e. reflections) on bad fusion splices?

Attached trace is a splitter showing return loss.  It's supposed to be fusion 
spliced, not connectorized.  There are several of these on this project.  
Trying to figure out if contractor snuck in some incorrect parts or if he's got 
issues with his fusion splicer.  I'd assume it's bad splices, but maybe 
coincidentally the reflectance just happens to be about right for UPC 
connectors.


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Re: [AFMUG] dumb OTDR question

[Trey Scarborough]

As Adam originally wrote "Attached trace is a splitter"

On 9/29/23 2:25 PM, Josh Luthman wrote:
Probably not a splitter.  It gets very confused shooting past it (both 
our cheap China & the demo Veex).


On Fri, Sep 29, 2023 at 3:24 PM Trey Scarborough > wrote:


Could be a bad splice, but if it is a splitter it could just be an
artifact of that. It all depends on the type of splitter you are
using and what wavelength the OTDR is. It also depends what is on
the other ends of the splitter. If that is a splitter with nothing
spliced to one of the ends you  can get a reflection off of a dead
end.

On 9/28/23 8:32 AM, Adam Moffett wrote:

Can you have return loss (i.e. reflections) on bad fusion splices?

Attached trace is a splitter showing return loss.  It's supposed
to be fusion spliced, not connectorized.  There are several of
these on this project.  Trying to figure out if contractor snuck
in some incorrect parts or if he's got issues with his fusion
splicer.  I'd assume it's bad splices, but maybe coincidentally
the reflectance just happens to be about right for UPC connectors.

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Re: [AFMUG] dumb OTDR question

[Josh Luthman]

Probably not a splitter.  It gets very confused shooting past it (both our
cheap China & the demo Veex).

On Fri, Sep 29, 2023 at 3:24 PM Trey Scarborough  wrote:

> Could be a bad splice, but if it is a splitter it could just be an
> artifact of that. It all depends on the type of splitter you are using and
> what wavelength the OTDR is. It also depends what is on the other ends of
> the splitter. If that is a splitter with nothing spliced to one of the ends
> you  can get a reflection off of a dead end.
> On 9/28/23 8:32 AM, Adam Moffett wrote:
>
> Can you have return loss (i.e. reflections) on bad fusion splices?
>
> Attached trace is a splitter showing return loss.  It's supposed to be
> fusion spliced, not connectorized.  There are several of these on this
> project.  Trying to figure out if contractor snuck in some incorrect parts
> or if he's got issues with his fusion splicer.  I'd assume it's bad
> splices, but maybe coincidentally the reflectance just happens to be about
> right for UPC connectors.
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
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Re: [AFMUG] dumb OTDR question

[Trey Scarborough]

Could be a bad splice, but if it is a splitter it could just be an 
artifact of that. It all depends on the type of splitter you are using 
and what wavelength the OTDR is. It also depends what is on the other 
ends of the splitter. If that is a splitter with nothing spliced to one 
of the ends you  can get a reflection off of a dead end.


On 9/28/23 8:32 AM, Adam Moffett wrote:

Can you have return loss (i.e. reflections) on bad fusion splices?

Attached trace is a splitter showing return loss.  It's supposed to be 
fusion spliced, not connectorized.  There are several of these on this 
project.  Trying to figure out if contractor snuck in some incorrect 
parts or if he's got issues with his fusion splicer.  I'd assume it's 
bad splices, but maybe coincidentally the reflectance just happens to 
be about right for UPC connectors.


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