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Appendix B – Product Approvals, Regulatory Design Considerations, Compliance
Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide 49
Regulatory Design Considerations
This section discusses hardware considerations, safety, and Telecom labeling requirements.
Hardware Considerations
Disclaimer: Multi-Tech Systems makes no warranty claims for vendor product recommendations listed below.
Other vendor products may or may not operate satisfactorily. Multi-Tech System’s recommended vendor
products only indicate that the product has been tested in controlled conditions and were found to perform
satisfactorily.
Figure B–1. Recommended Main Board Filtering
Surface mount ferrites are used on T&R (Tip and Ring) to mitigate emission levels out the RJ-11 cable. 220pF
capacitors are also used on T&R to reduce the common mode emissions that may be present in certain systems.
The ferrite and capacitors also aid in reducing the effects of transients that may be present on the line.