The ST L3000 is a solid state device designed to integrate may of the functions needed to interface a telephone line. This device is one of two integrated devices : the L3000S line interface circuit and the L3030 control unit. Together these devices perform the main features of the BORSHT functions :
Additional functions, such as battery reversal, extra battery use, line overvoltage sensing and metering-pulse injection are also featured ; most external characteristics,as AC and DC impedances,are programmable with external components.The SLIC injects ringing in balanced mode and for that, as well as for the operation in battery boosted, a positive battery voltage shall be available on the subscriber card. As the right ringing signal amplification both in voltage and in current is provided by SLIC, the ring signal generatorshall only provide a low level signal (0.285Vrms). This kit is fabricated using a 140V Bipolar technology for L3000S and a 12V Bipolar I2L technology for L3030. L3030 is available PLCC44 and L3000S in both FLEXIWATT15 and PowerSO-20 for surface mount applications.
