OptiFiber Pro custom test limit: Difference between revisions

From wiki.comcert.com
Jump to navigation Jump to search
VisualWikitext
No edit summary
No edit summary
Line 2: Line 2:
== Introduction ==
== 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.
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 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".
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 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 ===
=== Maximum length ===


{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
Line 23: Line 25:
|}
|}


&nbsp;
=== General Settings ===
 
=== 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: 800px"
{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
Line 78: Line 78:
|}
|}


(*) 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.
(*) 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 a limit on short links, use the recommended values between brackets, but please try to explain to your customer/supplier why this is not such a good idea.
 
&nbsp;


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


{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
Line 95: Line 93:
|-
|-
| Connector Loss (Max)
| Connector Loss (Max)
| style="text-align: right" | 0.30-0.50
| style="text-align: right" | 0.35-0.50
| style="text-align: right" | 0.30-0.50
| style="text-align: right" | 0.35-0.50
| style="text-align: right" | 0.30-0.50
| style="text-align: right" | 0.35-0.50
| style="text-align: right" | 0.30-0.50
| style="text-align: right" | 0.35-0.50
| style="text-align: right" | 0.30-0.50
| style="text-align: right" | 0.35-0.50
| style="text-align: right" | 0.30-0.50
| style="text-align: right" | 0.35-0.50
|-
|-
| Connector Loss (Min)
| Connector Loss (Min)
Line 129: Line 127:
| style="text-align: right" | -35.00
| style="text-align: right" | -35.00
| style="text-align: right" | -35.00
| style="text-align: right" | -35.00
| style="text-align: right" | -45.00
| style="text-align: right" | -55.00
| style="text-align: right" | -45.00
| style="text-align: right" | -55.00
| style="text-align: right" | -45.00
| style="text-align: right" | -55.00
| style="text-align: right" | -45.00
| style="text-align: right" | -55.00
|-
|-
| Reflectance (Min)
| Reflectance (Min)
Line 143: Line 141:
|}
|}


&nbsp;
=== APC OTDR ===
 
When performing OTDR testing on a single mode link, the OptiFiber Pro offers the possibility to change the identity of a non-reflective event type:
=== Event Settings for <span style="background-color:#FFFF00">APC</span> terminated links ===
 
{| border="1" cellpadding="1" cellspacing="1" style="width: 800px"
|-
! scope="col" | Parameter (dB)
! scope="col" | 850nm<sup>#</sup>
! scope="col" | 1300nm<sup>#</sup>
! scope="col" | 1310nm
! scope="col" | 1490nm
! scope="col" | 1550nm
! scope="col" | 1625nm
|-
| Connector Loss (Max)
| style="text-align: right" | N/A
| 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
|-
| Connector Loss (Min)
| 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
| style="text-align: right" | N/A
|-
| Splice Loss (Max)
| style="text-align: right" | N/A
| 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 (Min)
| 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
| style="text-align: right" | N/A
|-
| Reflectance (Max)
| style="text-align: right" | 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**
|-
| Reflectance (Min)
| 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
| style="text-align: right" | N/A
|}
 
(#) 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.

Revision as of 16:21, 8 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 (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 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 a limit on short links, use the recommended values between brackets, but please try to explain to your customer/supplier why this is not such 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

APC OTDR

When performing OTDR testing on a single mode link, the OptiFiber Pro offers the possibility to change the identity of a non-reflective event type:

Retrieved from "https://wiki.comcert.com/index.php?title=OptiFiber_Pro_custom_test_limit&oldid=8899"