I suppose a telecomm expert should answer this, but here is my (somewhat) educated guess.
The loop response of some SMPS to line and/or load variations can result short-term variations in output Z. Also, some SMPS have wide-band converter noise during start-up, and during response to load changes. Linear sources have, for practical purposes, no line or load variations when operated within ratings; and very hi CMR. There are (3) loops, that probably operate at different frequencies, that would cause a poorly-designed SMPS to adversly affect network ports: primary-side control, power-factor control, and output control. my opinions only. luck, Brian -----Original Message----- From: Alex McNeil [ mailto:[email protected]] Sent: Tuesday, June 17, 2003 2:09 AM To: '[email protected]' Subject: Transverse Balance Limitations 68.310_On Hook Hi Group, Can you help here. I pass the above FCC Part 68 specification when my product uses a Linear Power Supply but fail when I use my alternate Switch Mode Power Supply. Why should this be? Kind Regards Alex
