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Appendix B – Product Approvals, Regulatory Design Considerations, and Regulatory Compliance
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 120
EMC
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.
Recommended Ferrite (SMT)
Manufacturer – Associated Component Technology (ACT) – Part # - YCB-1206
Manufacturer – Murata Erie – Part # - BLM31A601SPT
Recommended Ferrite (Thru-Hole)
Manufacturer – Associated Component Technology (ACT) – Part # - WB2-2.OT
Recommended Capacitor
Manufacturer – NOVACAP – Part # - ESZZ11NKES50ZNXT
Manufacturer – Murata Erie – Part # - GHM3045X7R221K-GC (Surface mount device) and
Part # - DE0807B221K-KH (Thru-hole device)
Manufacturer – Ever Grace Electronic Industrials -- Part # - YP221K2EA7PS
Note: The capacitors used on T&R must have a Y2 safety rating.
Recommended Connector
Manufacturer – Stewart – Part # - SS-6446-NF-A431
Recommended Fuse
Manufacturer – RayChem – Part # - TR600-150
Note: The fuse is also needed to meet UL1950 3
rd
edition protection against over-voltage from
power line crosses.
Telecom
The RJ-11 connector must meet FCC Part 68 requirements. Refer to FCC Part 68 section 68.500
subpart F for connector specifications. A self-healing fuse is used in series with line to help
prevent damage to the DAA circuit. This fuse is needed for FCC Part 68 compliance.
Common Mode Choke
Manufacturer – TDK – Part # - ZJYS51R5-2PT
Recommended Sidactor
Manufacturer – Teccor Electronics – Part # - P#3100SA
Manufacturer – ST Microelectronics -- Part 1 – SMP100-270
Recommended Transceiver
Manufacturer – Analog Devices – Part # - ADM207EAR