Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 255)

AN93
Rev. 1.3 255
10.5. AM-Band Interference
In certain areas, AM-band interference causes poor connectivity rates and error rates. A good EMI common-mode
filter may be necessary in some situations. An example of an off-the-shelf unit designed to plug directly into the
phone line is the Coilcraft TRF-RJ11, which can be used for debugging or fixing problem locations.
Figure 49. Published Coilcraft TRF-RJ11 Filter Performance