OptiFiber Pro custom test limit: Difference between revisions

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== Introduction ==
== Introduction ==


It is our opinion that the lenght/loss limit specified in ISO/IEC 18011:2010 is not longer adequate to evaluate the quality of a recently installed fiber optic link; they are too relaxed.
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 ==
== Solution ==


We recommend the use of this custom limit for OTDR event evaluation. End-users could set Maximum Length and Maximum Overall Loss in accordance with the application limit.  For example, if the link is OM3 multimode fiber and the application is IEEE 10GBASE-SR, these values would be respectively 300m and 2,60dB (@ 850 nm). 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 ===
 
{| border="1" cellpadding="1" cellspacing="1" style="width: 500px;"
|-
| Parameter
| Default value
| Recommended value
|-
| Length (m)
| N/A
| N/A
|}


 
 


=== Limits for 850 nm ===
=== 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 ===


{| border="1" cellpadding="1" cellspacing="1" style="width: 500px;"
{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
|-
| 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)
! scope="col" style="width: 332px" | Parameter (m)
| N/A
! scope="col" style="width: 455px" | Recommended value
| N/A
|-
|-
| Segment Attenuation Coefficient (dB/km)
| style="width: 332px" | Length
| N/A
| style="width: 455px; text-align: right" | N/A
| 3,00
|}
|}


&nbsp;
&nbsp;


=== Limits for 1300&nbsp;nm ===
=== 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 ===


{| border="1" cellpadding="1" cellspacing="1" style="width: 500px;"
{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
|-
| Parameter
| Default value
| Recommended value
|-
|-
| Connector Loss (dB)
! scope="col" | Parameter
| 0,75
! scope="col" | 850nm
| 0,30
! scope="col" | 1300nm
! scope="col" | 1310nm
! scope="col" | 1490nm
! scope="col" | 1550nm
! scope="col" | 1625nm
|-
|-
| Splice Loss (dB)
| Overall Loss (Max) (dB)
| 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)
| Overall Loss (Min) (dB)
| -35,0
| style="text-align: right" | N/A
| -35,0
| 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 Loss (dB)
| Optical Return Loss (dB)
| 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)
| Segment Attenuation Coefficient* (Max) (dB/km)
| N/A
| style="text-align: right" | N/A (3.0)
| N/A
| style="text-align: right" | N/A (1.5)
| style="text-align: right" | N/A (0.4)
| style="text-align: right" | N/A (0.4)
| style="text-align: right" | N/A (0.4)
| style="text-align: right" | N/A (0.4)
|-
|-
| Segment Attenuation Coefficient (dB/km)
| Segment Attenuation Coefficient (Min) (dB/km)
| N/A
| style="text-align: right" | N/A
| 1,50
| 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
|}
|}
(*) 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;


=== Limits for 1310&nbsp;nm ===
=== Event Settings for <span style="background-color:#00FFFF">PC</span><span style="background-color:#00FFFF">/UPC</span> terminated links ===


{| border="1" cellpadding="1" cellspacing="1" style="width: 500px;"
{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
|-
|-
| Parameter
! scope="col" | Parameter (dB)
| Default value
! scope="col" | 850nm
| Recommended value
! scope="col" | 1300nm
! scope="col" | 1310nm
! scope="col" | 1490nm
! scope="col" | 1550nm
! scope="col" | 1625nm
|-
|-
| Connector Loss (dB)
| Connector Loss (Max)
| 0,75
| style="text-align: right" | 0.30-0.50
| 0,30
| 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
| 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)
| -45,0
| style="text-align: right" | 0.15
| -45,0
| style="text-align: right" | 0.15
| style="text-align: right" | 0.15
| style="text-align: right" | 0.15
| style="text-align: right" | 0.15
| style="text-align: right" | 0.15
|-
|-
| 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" | -35.00
| N/A
| style="text-align: right" | -35.00
| style="text-align: right" | -45.00
| style="text-align: right" | -45.00
| style="text-align: right" | -45.00
| style="text-align: right" | -45.00
|-
|-
| Segment Attenuation Coefficient (dB/km)
| Reflectance (Min)
| N/A
| style="text-align: right" | N/A
| 1,00
| 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;
&nbsp;


=== Limits for 1550&nbsp;nm ===
=== Event Settings for <span style="background-color:#FFFF00">APC</span> terminated links ===


{| border="1" cellpadding="1" cellspacing="1" style="width: 500px;"
{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
|-
|-
| 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)
| -45,0
| style="text-align: right" | N/A
| -45,0
| 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
| 1,00
| 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.
 
(**) For older generations (existing) APC connections, a value of -55.00dB may be more appropriate.

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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