In a message dated 7/8/02, Dieter Baldamus writes:
> I have a telecom unit that already passed all tests according to CS03, FCC > part 68 and NRT3. What are the chances to pass the Australian TS001 and > TS002 without modifying the unit? > > Hi Dieter: The following items are the key ones you should check to see if changes are likely to be needed: 1) Return loss requirements for Australia differ from the requirements you listed above, and are not easy to meet. 2) Pulse dialing in Australia requires special limiting of inductive transients, but the easiest way out of this is to not offer pulse dialing. Almost all central offices in Australia accept DTMF dialing. 3) For the first 300 mS after an off-hook transition, the DC V-I must be less than 6 volts at 20 mA. The easiest way to accomplish this is to have the steady-state DC V-I meet this requirement as well, and then have a good transient response that meets the 300 mS requirement. If your existing design already has a pulse dialing shunt relay, you can use this instead. 4) Safety isolation requirements for creepage and clearance are identical to EN 60950, but the hipot and surge test levels are higher. These four parameters are the ones that I usually see existing FCC designs fail. Also, if your product is a voice system, you may be subject to TS 003 and/or TS 004. These requirements are not likely to be met unless the design was done with them in mind. Joe Randolph Telecom Design Consultant Randolph Telecom, Inc. http://www.randolph-telecom.com
