39Appendix. SpecificationsThe A725 addSWITCH was built to match the specification of theETSI 300 220, Class I, Subclasses a and b, but other national normsare similar to this (for example, the CFR 47, Part 90, Subpart J).Table 2 shows the main operational parameters of the A725.Table 2. Operational ParametersParameter Min Typ Max UnitCommonSupply 5.0 6.2 10.0 VOperating Temperature -30 +70 °CRelative Humidity 10 99 %Class Protection IP65Data Rate (using the onboard software modem) 1000 1500a 2000 bpsOperating Frequency b 432 470 MHzFrequency Stability (-20 to +60 °C) ±1.5 kHzFrequency Stability (-30 to +70 °C) ±2.5 kHzReceiver