Dear Colleagues and Rx CMNR ad hoc participants,
Thanks very much for your participation in yesterday’s ad hoc meeting.
Two follow-up items from the discussion:
#1 –Thanks to Dave Chalupsky for posting yesterday’s contribution from Bryan Moffitt (Examination of
802.3-2012 Annex 40B Cable Clamp), now available at the P802.3bq public area.
#2 – Proposed text for Clause 113.5.4.3 from that contribution is repeated here for your consideration.
113.5.4.3 Rejection of External EM Fields
- When the cabling system is subjected to electromagnetic fields, currents are generated in the shield which may be converted to interference. This specification is provided to limit the sensitivity of the PMA receiver to external EM fields picked up by the
cabling system. It provides an assessment method of the electromagnetic performance of the link segment and the PHY, including the MDI.
- A test can be made using the cable clamp test defined in 40.6.1.3.3. A 6 dBm sine wave source from 80 MHz to 2000 MHz can be used to generate an external electromagnetic field and corresponding shield current.
- A system integrating a 40GBASE-T PHY may perform this test. Operational requirements of the transceiver during the test are determined by the manufacturer.
Please review this text and feel free to use the reflector for further discussion.
Best regards,
Pete Cibula
P802.3bq Rx CMNR ad hoc Chair