ISO/IEC 14763-3 edition 2 was published in 2014. This standard supports the implementation and operation of customer premises cabling by specifying systems and methods for inspecting and testing optical fiber cabling. In 2015, a corrigendum was published. Currently, an amendment is under review to make further corrections. Also, a supplement to the amendment was added.
The corrigendum made changes to connecting hardware attenuation values and modified the equations for test limits. The amendment made corrections to end face inspection, test methods, and uncertainty. The supplement to the amendment fixed errors within the uncertainties. Details of the changes are described herein.
2. Understanding ISO/IEC 14763-3 Cabling Standards
17-01-2018 2
ISO/IEC 14763-3 edition 2 was published in 2014. This standard supports the
implementation and operation of customer premises cabling by specifying systems and methods for
inspecting and testing optical fiber cabling. In 2015, a corrigendum was published. Currently, an
amendment is under review to make further corrections. Also, a supplement to the amendment was
added.
The corrigendum made changes to connecting hardware attenuation values and modified
the equations for test limits. The amendment made corrections to end face inspection, test
methods, and uncertainty. The supplement to the amendment fixed errors within the uncertainties.
Details of the changes are described herein.
Standards are constantly changing in response to commercial changes, and are intended to
align with customer needs. Sometimes the changes may appear confusing, as in this case, so it is a
good idea to pay closer attention to developments in standards.
www.flukenetworks.com| 2006-2017 Fluke Corporation
3. Understanding ISO/IEC 14763-3 Cabling Standards
17-01-2018 3
• Single-mode connecting hardware attenuation for “random mated” (mating two reference-grade
connectors) was changed from 0.30 dB maximum to 0.25 dB maximum1
• Single-mode connecting hardware attenuation for “mated against reference” (mating an unknown
connector to a reference grade connector) was changed from 0.65 dB maximum to 0.75 dB
maximum2
This correction was made to align actual data to the standard. The IEC connector standard
referenced in the footnotes uses the attenuation values for an LC/APC connector. Since an APC polish
single-mode connector typically has higher attenuation than a PC connector, it is used to represent the
worst case.
www.flukenetworks.com| 2006-2017 Fluke Corporation
Corrigendum 1
4. Understanding ISO/IEC 14763-3 Cabling Standards
17-01-2018 4
Regarding the change for the treatment of permanent link test limits, these equations are now used:
• Multimode: (2 x 0.50 dB) + (sum cable attenuation) + (sum embedded connection attenuation)
• Single-mode: (2 x 0.75 dB) + (sum cable attenuation) + (sum embedded connection attenuation)
These equations use the connector attenuation values for “mated against reference”. For the
multimode value of 0.50 dB, a Grade B performance for an LC/PC is used. For the single-mode value of
0.75 dB, a Grade C performance is used for an LC/APC.
1 For 50% as defined by a Grade C connector performance standard.
2 For all cases as defined by a Grade C connector performance standard.
www.flukenetworks.com| 2006-2017 Fluke Corporation
Corrigendum 1
5. Understanding ISO/IEC 14763-3 Cabling Standards
17-01-2018 5
Amendment 1 is in committee draft and contains information about inspecting connector end
faces used in installed cabling and test cords. The connectors are types with a single fiber, such as an LC
connector, or with multiple fibers, such as an MPO connector. Recommendations for cleaning these
interfaces are included. The amendment replaces the previously required inspection annex with a
now recommended annex. The reason is that during a 2015 subcommittee meeting, it was reported
that automated analysis of connector end faces is not consistent among suppliers - results vary.
Pending investigation by a task group asked to develop a calibration process, end face inspection will
remain informative (recommended).
Amendment 1 contains three tables for inspection requirements. Each table has information
on allowable scratches and defects for a given return loss.
• Multimode 20 dB for cylindrical (e.g. LC) and rectangular ferrules (e.g. MPO).
• Single-mode 35 dB for a PC cylindrical ferrules only (e.g. LC).
• Single-mode 60 dB APC for cylindrical (e.g. LC) or rectangular ferrules (e.g. MPO).
www.flukenetworks.com| 2006-2017 Fluke Corporation
Amendment 1
6. Understanding ISO/IEC 14763-3 Cabling Standards
17-01-2018 6
The tables for inspection are copied from IEC 61300-3-35, the standard used by manufacturers
of inspection equipment. One issue that is under investigation is the difference in requirements for
single-mode PC connectors. IEC 61300-3-35 specifies a 45 dB return loss and ISO/IEC 14763-3 requires
a 35 dB return loss. As a workable solution, the information from IEC 61300-3-35 for 45 dB return loss
with minor modifications may be used. This will be discussed at the February 2016 meeting.
www.flukenetworks.com| 2006-2017 Fluke Corporation
Amendment 1
7. Understanding ISO/IEC 14763-3 Cabling Standards
17-01-2018 7
The supplement to Amendment 1 simply corrects uncertainty values for the test methods. The
uncertainty assigned to various test methods is a separate topic.
www.flukenetworks.com| 2006-2017 Fluke Corporation
Supplement to Amendment 1
8. Understanding ISO/IEC 14763-3 Cabling Standards
17-01-2018 8
As mentioned earlier, standards are not stagnant and in today’s climate standards change
quicker than ever. It is sometimes difficult to keep up with complex standards. Fortunately, companies
such as Fluke Networks are paying close attention to these changes and providing guidance with
communications and with up to date test equipment used for compliance testing.
www.flukenetworks.com| 2006-2017 Fluke Corporation
Wrap up
