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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.
While application limits continue to be more and more stringent, the test limits proposed by ISO and ANSI have hardly changed and are no longer in line with the current state of technology. 
 
Using ISO/IEC or ANSI/TIA test limits is especially problematic when testing multi-segment multi-mode fiber optic links, frequently in use in datacenters.
 
When using ISO/IEC or ANSI/TIA test limits, it becomes increasingly more difficult for consultants to evaluate the workmanship of the installer, one of the main reasons to certify a fiber optic plant in the first place.


== 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 context is available during the Certified Cabling Test Training module VERSIVOTDR.
We recommend upgrading to the latest firmware version before continuing.  Use the values below to create a custom limit for OTDR testing of multi-mode and single mode fiber optic links.
 
Please be aware that APC connections are non-reflective and likely to be identified by the OTDR as splices. In that case, you must assist the OTDR in applying the correct limit for connector loss.


=== Maximum length ===
=== Maximum length ===


{| border="1" cellpadding="1" cellspacing="1" style="width: 500px;"
{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
|-
|-
| Parameter
! scope="col" style="width: 332px" | Parameter (m)
| Default value
! scope="col" style="width: 455px" | Recommended value
| Recommended value
|-
|-
| Length (m)
| style="width: 332px" | Length
| N/A
| style="width: 455px; text-align: right" | N/A
| N/A
|}
|}


 
=== General Settings ===
 
=== Limits for 850 nm ===


{| border="1" cellpadding="1" cellspacing="1" style="width: 500px;"
{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
|-
|-
| Parameter
! scope="col" | Parameter
| 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)
| Overall Loss (Max) (dB)
| 0,75
| style="text-align: right" | N/A
| 0,30
| 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
|-
|-
| Splice Loss (dB)
| Overall Loss (Min) (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)
| Optical Return Loss (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)
| Segment Attenuation Coefficient* (Max) (dB/km)
| 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 (Min) (dB/km)
| N/A
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
|-
| style="text-align: right" | N/A
| Segment Attenuation Coefficient (dB/km)
| style="text-align: right" | N/A
| N/A
| style="text-align: right" | N/A
| 3,00
| style="text-align: right" | N/A
|}
|}


 
(*) Accurate measurements of Segment Attenuation Coefficient requires a long fiber to be tested.  Therefore, it is recommended to set this limit to N/A (not applicable) for multi-mode and short single mode segments.  If you must specify limits even when the link is too short for accurate measurement, we recommend using the default values, but please try to explain to your customer/supplier why this is not a good idea.


=== Limits for 1300 nm ===
=== Event Settings ===


{| 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" | 0.35-0.50
| 0,30
| style="text-align: right" | 0.35-0.50
| style="text-align: right" | 0.35-0.50
| style="text-align: right" | 0.35-0.50
| style="text-align: right" | 0.35-0.50
| style="text-align: right" | 0.35-0.50
|-
|-
| 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" | 0.15
| -35,0
| 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" | -55.00
| style="text-align: right" | -55.00
| style="text-align: right" | -55.00
| style="text-align: right" | -55.00
|-
|-
| Segment Attenuation Coefficient (dB/km)
| Reflectance (Min)
| 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
|}
|}


 
=== Measuring Single mode fiber links with APC connectors ===
During OTDR testing of a single mode link with APC connections, you may need to change the identity of non-reflective events.


=== Limits for 1310 nm ===
APC connections produce non reflective events and consequently evaluated as splices (first image).  To change the event type, tap the black triangle in the upper right corner of the green box (second image) an change the type accordingly.  The non-reflective event is now evaluated as an APC connection with the correct limit applied (third image).


{| border="1" cellpadding="1" cellspacing="1" style="width: 500px;"
[[File:EmbeddedAPCConnectionSplice.png|left|thumb]]
|-
| Parameter
| Default value
| Recommended value
|-
| Connector Loss (dB)
| 0,75
| 0,30
|-
| Splice Loss (dB)
| 0,30
| 0,15
|-
| 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
|}
 
 
 
=== Limits for 1550 nm ===


{| border="1" cellpadding="1" cellspacing="1" style="width: 500px;"
[[File:EmbeddedAPCConnection_ChangeEventType.png|left|thumb]]
|-
| Parameter
| Default value
| Recommended value
|-
| Connector Loss (dB)
| 0,75
| 0,30
|-
| Splice Loss (dB)
| 0,30
| 0,15
|-
| 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
|}


 
[[File:EmbeddedAPCConnectionAPCConnection.png|left|thumb]]

Latest revision as of 13:57, 9 April 2025

Introduction

While application limits continue to be more and more stringent, the test limits proposed by ISO and ANSI have hardly changed and are no longer in line with the current state of technology.

Using ISO/IEC or ANSI/TIA test limits is especially problematic when testing multi-segment multi-mode fiber optic links, frequently in use in datacenters.

When using ISO/IEC or ANSI/TIA test limits, it becomes increasingly more difficult for consultants to evaluate the workmanship of the installer, one of the main reasons to certify a fiber optic plant in the first place.

Solution

We recommend upgrading to the latest firmware version before continuing. Use the values below to create a custom limit for OTDR testing of multi-mode and single mode fiber optic links.

Please be aware that APC connections are non-reflective and likely to be identified by the OTDR as splices. In that case, you must assist the OTDR in applying the correct limit for connector loss.

Maximum length

Parameter (m) Recommended value
Length N/A

General Settings

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 N/A N/A N/A N/A N/A
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 to be tested. Therefore, it is recommended to set this limit to N/A (not applicable) for multi-mode and short single mode segments. If you must specify limits even when the link is too short for accurate measurement, we recommend using the default values, but please try to explain to your customer/supplier why this is not a good idea.

Event Settings

Parameter (dB) 850nm 1300nm 1310nm 1490nm 1550nm 1625nm
Connector Loss (Max) 0.35-0.50 0.35-0.50 0.35-0.50 0.35-0.50 0.35-0.50 0.35-0.50
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 -55.00 -55.00 -55.00 -55.00
Reflectance (Min) N/A N/A N/A N/A N/A N/A

Measuring Single mode fiber links with APC connectors

During OTDR testing of a single mode link with APC connections, you may need to change the identity of non-reflective events.

APC connections produce non reflective events and consequently evaluated as splices (first image). To change the event type, tap the black triangle in the upper right corner of the green box (second image) an change the type accordingly. The non-reflective event is now evaluated as an APC connection with the correct limit applied (third image).

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