Ferrite Core Cable Modem

Each time the cable goes through the center of the toroid counts as one turn.

Ferrite core cable modem.

I fitted a couple of ferrites clip on maplin jobs to the power cable to my router not the phone network cable. A conductive cable acts as an antenna if the device produces radio frequency energy this can be transmitted through the cable which acts as an unintentional radiator in this case the bead is required for regulatory compliance to reduce emi. Adsl runs at around 30khz to 1 1mhz. Here the magnetic flux of the noise current can be reduced with the help of ferrite.

I ve 2 of these rj 45 ethernet cables but each cable only has 1 x ferret choke on 1 end of the rj 45 so. Ferrite beads prevent electromagnetic interference emi in two directions. This video just hits a generic use at a high level. The magnetic field generates throughout the cable.

Say 1 end is the computer and the other end is the router or say 1 end is the cable modem and the other end is the router which ends of the above gears should i choose to put. Modems already have ferrite beads inside. I think my speedstream 5242e dsl modem itself was the cause of alot the rfi noise as my cable are pretty short and are all under 3ft. I move the two ferrite choke cores to the dsl modem power cord.

I moved one ferrite choke core to the ethernet cable and left. There s a large am radio station transmitting near you swamping the front end of your modem. The magnetic field is absorbed by the ferrite core and which converts magnetic energy in to heat energy. Ferrite cable cores are available at mouser electronics.

From a device or to a device. Depending on the size of your cable the larger inner diameter toroid may be the most effective. Mouser offers inventory pricing datasheets for ferrite cable cores. Now consider a cable passes through the ferrite core and which carries both noise signal and data signal.

Choosing the wrong type of core will affect its performance too if any. Wrapped about 5 or 6 times each in series close to the modem. I was starting to see more errors than normal i m currently running from a temporary set up while re fitting my study and since fitting the ferrites i think things have been slightly better.