Telecommunication Port Emissions (posted on 8/13/07)
EMC Directive (2004/108/EC) became effective July 20, 2007. All products placed on the market in Europe after this date must meet the requirements of the new Directive. Testing to the new EMC Directive requires that the telecommunication ports must be tested for conducted emissions per EN 55022. Both EN 55022:1998+A1+A2 and EN 55022: 2006 standards are now listed in European OJ. If your product was tested, including telecom port conducted emissions, to meet the requirements of EN 55022: 1998 with A1 & A2, your product is in compliance until January 10, 2009. In comparing the two versions of EN 55022, one of major differences is the specification for the Impedance Stabilization Network Longitudinal Conversion Loss for telecom ports (the ISN specifications are still controversial in general). Not only did the characteristics of the ISN's change with the new versions of CISPR 22, but an 8 wire ISN requirement was added, and should be used for all 8-wire cables. The alternate clamp-method is no longer called for when measuring 8-wire cables. CISPR 22: 2006 requires that you use an ISN based on the number of wires in the cable, not the number actually being used. Generally, this means that All Ethernet telecommunications port tests should be done with an 8 wire ISN, as Cat 3, Cat 5 and Cat 6 cables all have 8 wires.

EN 55022: 1998
The Date Of Withdrawal of EN 55022: 1998 has again been delayed, this time until August 1, 2007. Therefore, the 1994 version can be used for presumption of conformity until 2007. The intention is to publish a new EN55022:2005 shortly and then for a couple of years manufacturers will have the option of complying with 1994 plus amendments (3rd edition) or 1998 plus amendments (including ferrites)- 4th edition or 2005 version, (5th edition). In 2007 the option of compliance with the 1994 version will cease.

Latest updates of the EMC/R&TTE Directive standards lists (April 2004)
Free Downloads:
EMC Standards April 2004.pdf
RTTE Standards April 2004.pdf

EMC
Make sure you're covered! The FCC has specified requirements for testing radiated emissions above 1GHz for several years now. The European Union has no obvious regulations in this respect. However, due to the proliferation of systems using clock frequencies in the several hundreds of MHz, the European Union is now looking at implementing similar requirements in EN 55022 (CISPR 22), and EN 55011 (CISPR 11). They caution manufacturers that even though there are no limits defined above 1GHz, they are still responsible for noninterference at these frequencies. They (the EU) are asking test labs to recommend to their clients testing above 1GHz using the FCC rules as a guide.

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