Technical Note 001: The establishment of conformance of CP Links to installation performance requirements of AS/NZS 3080:2013.

Text in Italics is derived from the standards.

Applicability                                                                

The following applies to the requirements for establishing installation performance conformance by VTI Services to meet its NATA reporting obligations for CP Links to AS/NZS 3080 and ISO/IEC 11801.

Background

Clause 3.1.32 of AS/NZS 3080 defines a CP Cable as cable connecting the consolidation point to the telecommunications outlet(s).

Clause 3.1.33 of AS/NZS 3080 defines a CP Link as part of the permanent link between the floor distributor and the consolidation point, including the connecting hardware at each end.

The conformance of performance requirements of AS/NZS 3080 are based on installed Channels.

AS/NZS 3080 Clause 4 b) indicates that performance conformance can be achieved by one of three methods;

1.        Channel Implementation    (Method 1)

Based on a design and implementation of the installed cabling system (including the installed patch cords) that ensures channel performance is met.

2.        Permanent Link /CP Link Implementation   (Method 2)

Attachment of appropriate components (CP cable, TO and cords) to a CP Link that meets the performance requirements of Annex A of AS/NZS 3080.

Installation conformance testing is typically utilised to establish performance compliance to Annex A of AS/NZS 3080.

It should be noted that;

·         ‘Note a’ of Table B.1 – Test regime for reference conformance and installation conformance- Balanced cabling states that “length is not a pass/fail criterion.

·         Alien crosstalk requirements apply to Channels, Permanent Links and CP Links for Class EA and above.

·         Short CP Link cables (e.g. under 15m in length) may pass conformance requirements at time of installation, however short CP links may impact the overall performance of the associated permanent link when implemented. It is therefore recommended that CP Link cables are a minimum of 15 metres in length or that specified by the cable system manufacturer.

3.        Reference Implementation                 (Method 3)

Reference Implementation is based on statistical modelling contained within Clause 7 Reference implementation for balanced cabling of AS/NZS 3080 and the use of appropriate cabling and connecting hardware components.

The statistical approach utilises mathematical modelling based on length assumptions contained within Table 32 Length assumptions used in mathematical modelling of horizontal cabling.  

 

However, paragraph four (4) of Clause 7.2.2.2 Dimensions of AS/NZS 3080 states;

 

Table 32 contains the length assumptions of the mathematical model used to validate channel performance using components of Clauses 9, 10 and 13.  They do not represent absolute restrictions on the implementation of channels and permanent links, but may be used for guidance.


Reference Implementations are typically supported by a manufacturer’s “Statement of Conformance”, which is based on laboratory test reports.

CP Link Installation Conformance

The conformance assessment by VTI Services of CP Link installation performance as part of its NATA reporting has the following requirements:-

A.       For Class D and E installations attempting to use a Channel Implementation (Method 1) for the installation performance conformance to AS/NZS 3080 ;

·     Since the CP Link is only part of the permanent link and there are no CP cable or patch cords attached, it is not possible or appropriate to test a CP Link as a channel. 

·     The CP Link cannot be tested using Channel Implementation (Method 1).

B.       For Class D and E installations utilising a CP Link Implementation (Method 2) for the installation performance conformance to AS/NZS 3080 ;

·     CP Link performance conformance can be achieved by successful testing of all Class D and E parameters.  Length of the CP Link is not a consideration for this CP testing.

·     Although the CP Link conformance is not affected directly by the length of the associated CP cable (from CP to TO), the length of the CP cable when installed will affect other performance parameters that do form part of the channel conformance.  

·     After the CP cable is installed, the full permanent link or channel must be tested.

C.       For Class EA, F and FA installations it is recommended that Reference Implementation (Method 3) be used for the installation conformance to AS/NZS 3080;

·     As length of the CP Link forms part of the assumptions for Reference Implementation, the length is required to be specified by the cable system manufacturer’s “Statement of Compliance”. 

Note:  Where length is a criteria for a Reference Implementation, the incorrect setting of NVP during testing may effect compliance as the reported length is dependent on the stated NVP.

·     Alien crosstalk testing is a requirements for EA, F and FA installations. 

·     Compliance is achieved by either providing acceptable AXT test results, or providing a cable system manufacturer’s written “Statement of Compliance” that excludes the need for in-field alien crosstalk testing.  The statement is required to state all conditions necessary to meet the cable system manufacturer’s reference implementation including the CP Link cable length.  

·     After the CP cable is installed, the full permanent link or channel must be tested.

 

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