The choice of lightning arrester in a Campus (二)
The choice of lightning arrester in a Campus (二)
2.1 Selection of voltage
Signal SPD maximum operating voltage of choice should be determined on the basis of data communication lines operating voltage. It is a select signal surge arrester is an important parameter , but in practical applications the choice of different communication lines do not have a common standard . SPD maximum operating voltage must be greater than the operating voltage of the communication line 1.2 times .
2.2 Selection rate matching
Data transfer rates of different communication systems are different, signal surge protector installed in the signal line , which supports transfer rates should not be less than the transmission rate of the communication system itself , otherwise it will lead to increased communication interruption or error rate , the impact of communication normal operation of the system . For signal surge protective device communication system installed , and if there is a communication interruption or error rate increase case , the reason is more complicated and may not be the cause of lightning , the user can proceed to check the following points : whether the length of the communication line too long, if too long , consider shortening ; breakpoint number ; connection quality ; communication connector is tightened.
2.3 Insertion Loss
Signal surge protection device installed in the signal line , because of the impact of additional capacitance , in the case of high frequency , there will be a certain degree of insertion loss. When selecting signal SPD , its insertion loss should be less than the value specified in the relevant standards .
2.4 Interface type selection
Signal SPD installed in series on the line . In order to match the impedance and maintain minimum contact resistance , should select the interface and communication lines of the same type , for RJ, SD line to pay attention to the type of interface lines to fit connector for coaxial cable with male and female attention .
For more information on surge protective device , please pay attention to our official website:www.fatech-surge-protection.com.
FATECH ELECTRONIC LTD.
Dec.18,2014
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