Description
The GS1T70-D540/2 converter has been designed for the “U” interface of an ISDN-NTBA (Network Termination Basic Access) system with either 4B3T or 2B1Q standard trasmission. Two outputs, 5V/72mA and 40V/12mA are supplied. The converter offers short-circuit protection (shortcircuit on 40V output doesn’t affect 5V output and the input power never exceeds the limits of the specification), input either voltage polarity, 80% minimum efficiency at maximum load, input and output filtering to meet very stringent noise requirements. When the input voltage is below 18V, the converter offers a very high input impedance and a maximum quiescent current of 10µA according to the standard ETR 080. In addition, the wide operating input voltage range allows it to operate within the whole range of LT (Line Termination) battery voltage and its relevant line resistance. 3000VRMS isolation voltage for 60 second is provided between input to output 2 and between output 1 and output 2. No insulation is provided between input and output 1. The design of the module has been conducted using, as reference standards, the following: EN 60950, VDE0878 part 1 class B (EMC), EN55022 class B (EMC), CCITT 430, ETS 300 012 and ETS 300 047 (ISDN BASIC ACCESS, Safety and Protection); anyway, please note that no certification processes have been carried out on the module itself.