OptiFiber Pro custom test limit: Difference between revisions

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== Introduction ==
== Introduction ==


Limits specified by ISO/IEC11801:2017 and ISO/IEC14763-3:2014 (Information technology -- Implementation and operation of customer premises cabling -- Part 3: Testing of optical fibre cabling) are no longer adequate to evaluate the quality of recently installed fiber optic infrastructure.
As application limits continue to become more stringent, limits proposed by ISO and ANSI are no longer acceptable to evaluate the quality of a fiber optic infrastructure. Using recent ISO and ANSI test limits is especially problematic when testing multi-mode fiber optic links with more than two connections, which is often the case in datacenters.
 
This article was recently updated for firmware version 6.0 (January 2019).


 
 
Line 10: Line 8:
== Solution ==
== Solution ==


Create the following custom limit for OTDR testing. More information is available during the Certified Cabling Test Training module VERSIVOTDR.
We stronly recommend upgrading to Versiv firmware version 6.8 before continuing.  Unless specified otherwise, use these values to create one custom limit for testing PC/UPC terminated links and a second custom limit for testing APC terminated links.  Please remember that in case of OTDR, "Connector Loss" should be interpreted as "Reflective Event Loss" and "Splice Loss" as "Non reflective Event Loss".


 
 


=== Maximum length for PC, UPC and APC terminated links ===
=== Maximum length for <span style="background-color:#00FFFF">PC</span>, <span style="background-color:#00FFFF">UPC</span> and <span style="background-color:#FFFF00">APC</span> terminated links ===


{| style="width: 800px" cellspacing="1" cellpadding="1" border="1"
{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
|-
|-
! scope="col" | Parameter
! scope="col" style="width: 332px" | Parameter (m)
! scope="col" | Recommended value
! scope="col" style="width: 455px" | Recommended value
|-
|-
| Length (m)
| style="width: 332px" | Length
| N/A
| style="width: 455px; text-align: right" | N/A
|}
|}


&nbsp;
&nbsp;


=== General Settings for PC, UPC and APC terminated links ===
=== General Settings for <span style="background-color:#00FFFF">PC</span>, <span style="background-color:#00FFFF">UPC</span> and <span style="background-color:#FFFF00">APC</span> terminated links ===


{| style="width: 800px" cellspacing="1" cellpadding="1" border="1"
{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
|-
|-
! scope="col" | Parameter
! scope="col" | Parameter
Line 39: Line 37:
! scope="col" | 1625nm
! scope="col" | 1625nm
|-
|-
| Overall Loss (Max)
| Overall Loss (Max) (dB)
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
|-
|-
| Overall Loss (Min)
| Overall Loss (Min) (dB)
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
|-
|-
| Optical Return Loss
| Optical Return Loss (dB)
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
|-
|-
| Segment Attenuation Coefficient (Max)
| Segment Attenuation Coefficient* (Max) (dB/km)
| 3.0
| style="text-align: right" | N/A (3.0)
| 1.5
| style="text-align: right" | N/A (1.5)
| 1.0
| style="text-align: right" | N/A (0.4)
| 1.0
| style="text-align: right" | N/A (0.4)
| 1.0
| style="text-align: right" | N/A (0.4)
| 1.0
| style="text-align: right" | N/A (0.4)
|-
|-
| Segment Attenuation Coefficient (Min)
| Segment Attenuation Coefficient (Min) (dB/km)
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
|}
|}
(*) Accurate measurements of Segment Attenuation Coefficient requires a long fiber. Therefore, it is recommended to set this limit to N/A (not applicable) for multi-mode and short singlemode segments. If you have to enforce a&nbsp;limit, use the recommended values between brackets, but first try to explain to your customer/supplier why this is not a good idea.


&nbsp;
&nbsp;


=== General Settings (PC and UPC terminated links) ===
=== Event Settings for <span style="background-color:#00FFFF">PC</span><span style="background-color:#00FFFF">/UPC</span> terminated links ===


{| style="width: 500px" cellspacing="1" cellpadding="1" border="1"
{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
|-
|-
! scope="col" | Parameter
! scope="col" | Parameter (dB)
! scope="col" | 850nm
! scope="col" | 850nm
! scope="col" | &nbsp;
! scope="col" | 1300nm
! scope="col" | &nbsp;
! scope="col" | 1310nm
! scope="col" | &nbsp;
! scope="col" | 1490nm
! scope="col" | &nbsp;
! scope="col" | 1550nm
! scope="col" | &nbsp;
! scope="col" | 1625nm
! scope="col" | &nbsp;
|-
|-
| &nbsp;
| Connector Loss (Max)
| &nbsp;
| style="text-align: right" | 0.30-0.50
| &nbsp;
| style="text-align: right" | 0.30-0.50
| &nbsp;
| style="text-align: right" | 0.30-0.50
| &nbsp;
| style="text-align: right" | 0.30-0.50
| &nbsp;
| style="text-align: right" | 0.30-0.50
| &nbsp;
| style="text-align: right" | 0.30-0.50
| &nbsp;
|-
|-
| &nbsp;
| Connector Loss (Min)
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
|-
|-
| &nbsp;
| Splice Loss (Max)
| &nbsp;
| style="text-align: right" | 0.15
| &nbsp;
| style="text-align: right" | 0.15
| &nbsp;
| style="text-align: right" | 0.15
| &nbsp;
| style="text-align: right" | 0.15
| &nbsp;
| style="text-align: right" | 0.15
| &nbsp;
| style="text-align: right" | 0.15
| &nbsp;
|-
|-
| &nbsp;
| Splice Loss (Min)
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
|-
|-
| &nbsp;
| Reflectance (Max)
| &nbsp;
| style="text-align: right" | -35.00
| &nbsp;
| style="text-align: right" | -35.00
| &nbsp;
| style="text-align: right" | -45.00
| &nbsp;
| style="text-align: right" | -45.00
| &nbsp;
| style="text-align: right" | -45.00
| &nbsp;
| style="text-align: right" | -45.00
| &nbsp;
|-
|-
| &nbsp;
| Reflectance (Min)
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
| style="text-align: right" | N/A
| &nbsp;
|}
|}


&nbsp;
&nbsp;


&nbsp;
=== Event Settings for <span style="background-color:#FFFF00">APC</span> terminated links ===
 
&nbsp;


&nbsp;
{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
 
=== Limits for 850 nm ===
 
{| style="width: 500px" cellspacing="1" cellpadding="1" border="1"
|-
|-
| Parameter
! scope="col" | Parameter (dB)
| Default value
! scope="col" | 850nm<sup>#</sup>
| Recommended value
! scope="col" | 1300nm<sup>#</sup>
! scope="col" | 1310nm
! scope="col" | 1490nm
! scope="col" | 1550nm
! scope="col" | 1625nm
|-
|-
| Connector Loss (dB)
| Connector Loss (Max)
| 0,75
| style="text-align: right" | N/A
| 0,30
| style="text-align: right" | N/A
| style="text-align: right" | 0.30-0.50
| style="text-align: right" | 0.30-0.50
| style="text-align: right" | 0.30-0.50
| style="text-align: right" | 0.30-0.50
|-
|-
| Splice Loss (dB)
| Connector Loss (Min)
| 0,30
| style="text-align: right" | N/A
| 0,15
| style="text-align: right" | N/A
| style="text-align: right" | N/A
| style="text-align: right" | N/A
| style="text-align: right" | N/A
| style="text-align: right" | N/A
|-
|-
| Reflectance (dB)
| Splice Loss (Max)
| -35,0
| style="text-align: right" | N/A
| -35,0
| style="text-align: right" | N/A
| style="text-align: right" | 0.30-0.50
| style="text-align: right" | 0.30-0.50
| style="text-align: right" | 0.30-0.50
| style="text-align: right" | 0.30-0.50
|-
|-
| Overall Loss (dB)
| Splice Loss (Min)
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| style="text-align: right" | N/A
| style="text-align: right" | N/A
| style="text-align: right" | N/A
| style="text-align: right" | N/A
|-
|-
| Overall ORL (dB)
| Reflectance (Max)
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| style="text-align: right" | -65.00**
| style="text-align: right" | -65.00**
| style="text-align: right" | -65.00**
| style="text-align: right" | -65.00**
|-
|-
| Segment Attenuation Coefficient (dB/km)
| Reflectance (Min)
| N/A
| style="text-align: right" | N/A
| 3,00
| style="text-align: right" | N/A
| style="text-align: right" | N/A
| style="text-align: right" | N/A
| style="text-align: right" | N/A
| style="text-align: right" | N/A
|}
|}


&nbsp;
(#) APC style connectors aren't used in combination with&nbsp;multi-mode fibers.


=== Limits for 1300&nbsp;nm ===
(**) For older generations (existing) APC connections, a value of -55.00dB may be more appropriate.
 
{| style="width: 500px" cellspacing="1" cellpadding="1" border="1"
|-
| Parameter
| Default value
| Recommended value
|-
| Connector Loss (dB)
| 0,75
| 0,30
|-
| Splice Loss (dB)
| 0,30
| 0,15
|-
| Reflectance (dB)
| -35,0
| -35,0
|-
| Overall Loss (dB)
| N/A
| N/A
|-
| Overall ORL (dB)
| N/A
| N/A
|-
| Segment Attenuation Coefficient (dB/km)
| N/A
| 1,50
|}
 
&nbsp;
 
=== Limits for 1310&nbsp;nm ===
 
{| style="width: 500px" cellspacing="1" cellpadding="1" border="1"
|-
| Parameter
| Default value
| Recommended value
|-
| Connector Loss (dB)
| 0,75
| 0,30
|-
| Splice Loss (dB)
| 0,30
| 0,15 (UPC) or 0.30 (APC)*
|-
| Reflectance (dB)
| -45,0
| -45,0
|-
| Overall Loss (dB)
| N/A
| N/A
|-
| Overall ORL (dB)
| N/A
| N/A
|-
| Segment Attenuation Coefficient (dB/km)
| N/A
| 1,00
|}
 
(*) When testing APC terminated fibers, the OTDR will interpret the APC connection as a splice and apply the splice limit accordingly.&nbsp; In case of APC terminated fiber, we recommend using&nbsp;the same limit for connection and splice i.e. 0.30dB.
 
&nbsp;
 
=== Limits for 1550&nbsp;nm ===
 
{| style="width: 500px" cellspacing="1" cellpadding="1" border="1"
|-
| Parameter
| Default value
| Recommended value
|-
| Connector Loss (dB)
| 0,75
| 0,30
|-
| Splice Loss (dB)
| 0,30
| 0,15 (UPC) or 0.30 (APC)*
|-
| Reflectance (dB)
| -45,0
| -45,0
|-
| Overall Loss (dB)
| N/A
| N/A
|-
| Overall ORL (dB)
| N/A
| N/A
|-
| Segment Attenuation Coefficient (dB/km)
| N/A
| 1,00
|}
 
(*) When testing APC terminated fibers, the OTDR will interpret the APC connection as a splice and apply the splice limit accordingly.&nbsp; In case of APC terminated fiber, we recommend using&nbsp;the same limit for connection and splice i.e. 0.30dB.
 
&nbsp;

Latest revision as of 12:22, 25 August 2023

Introduction

As application limits continue to become more stringent, limits proposed by ISO and ANSI are no longer acceptable to evaluate the quality of a fiber optic infrastructure. Using recent ISO and ANSI test limits is especially problematic when testing multi-mode fiber optic links with more than two connections, which is often the case in datacenters.

 

Solution

We stronly recommend upgrading to Versiv firmware version 6.8 before continuing.  Unless specified otherwise, use these values to create one custom limit for testing PC/UPC terminated links and a second custom limit for testing APC terminated links.  Please remember that in case of OTDR, "Connector Loss" should be interpreted as "Reflective Event Loss" and "Splice Loss" as "Non reflective Event Loss".

 

Maximum length for PC, UPC and APC terminated links

Parameter (m) Recommended value
Length N/A

 

General Settings for PC, UPC and APC terminated links

Parameter 850nm 1300nm 1310nm 1490nm 1550nm 1625nm
Overall Loss (Max) (dB) N/A N/A N/A N/A N/A N/A
Overall Loss (Min) (dB) N/A N/A N/A N/A N/A N/A
Optical Return Loss (dB) N/A N/A N/A N/A N/A N/A
Segment Attenuation Coefficient* (Max) (dB/km) N/A (3.0) N/A (1.5) N/A (0.4) N/A (0.4) N/A (0.4) N/A (0.4)
Segment Attenuation Coefficient (Min) (dB/km) N/A N/A N/A N/A N/A N/A

(*) Accurate measurements of Segment Attenuation Coefficient requires a long fiber. Therefore, it is recommended to set this limit to N/A (not applicable) for multi-mode and short singlemode segments. If you have to enforce a limit, use the recommended values between brackets, but first try to explain to your customer/supplier why this is not a good idea.

 

Event Settings for PC/UPC terminated links

Parameter (dB) 850nm 1300nm 1310nm 1490nm 1550nm 1625nm
Connector Loss (Max) 0.30-0.50 0.30-0.50 0.30-0.50 0.30-0.50 0.30-0.50 0.30-0.50
Connector Loss (Min) N/A N/A N/A N/A N/A N/A
Splice Loss (Max) 0.15 0.15 0.15 0.15 0.15 0.15
Splice Loss (Min) N/A N/A N/A N/A N/A N/A
Reflectance (Max) -35.00 -35.00 -45.00 -45.00 -45.00 -45.00
Reflectance (Min) N/A N/A N/A N/A N/A N/A

 

Event Settings for APC terminated links

Parameter (dB) 850nm# 1300nm# 1310nm 1490nm 1550nm 1625nm
Connector Loss (Max) N/A N/A 0.30-0.50 0.30-0.50 0.30-0.50 0.30-0.50
Connector Loss (Min) N/A N/A N/A N/A N/A N/A
Splice Loss (Max) N/A N/A 0.30-0.50 0.30-0.50 0.30-0.50 0.30-0.50
Splice Loss (Min) N/A N/A N/A N/A N/A N/A
Reflectance (Max) N/A N/A -65.00** -65.00** -65.00** -65.00**
Reflectance (Min) N/A N/A N/A N/A N/A N/A

(#) APC style connectors aren't used in combination with multi-mode fibers.

(**) For older generations (existing) APC connections, a value of -55.00dB may be more appropriate.

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