According to Volume 8/1, a manufacturer may replace the physical layer of his product by another physical layer of the same medium provided that the following conditions are met:
Replacing a TP certified physical layer
Replacement
Repercussions?
Replacement of a digital transceiver by another digital transceiver:
Re-registration/retesting not required
Inform the Certification department of KNX Association of this change
Replacement of a digital transceiver by an analog transceiver (ASIC, ST or discrete solution)
Re-registration and re-testing is required for new combination of analog transceiver and stack
This implies that the physical part of the Link Layer needs to be implemented in the stack, as analog transceivers only provide a bit interface to the KNX TP Physical layer.
Extra tests required: To verify compliance with this additional implementation, the manufacturer must perform the tests specified in Volume 8/2/2 of the KNX Standard and document the results in an internal test report. This report can then serve as the basis for an (online) KNX audit, during which the manufacturer repeats the tests and shares the scope images to confirm that the device conforms to the requirements. The following tests must be carried out:
Physical Layer coding, decoding, and collision tests.
Complete Link Layer tests, covering both the physical and data parts of the Link Layer.
The test procedure and test devices are clearly described in Volume 8/2/2 and tests cannot be performed with the EITT.
Replacing an RF certified physical layer
Reference is made to 08_01 System Conformance Testing - Introduction, Clause 4.
