Silver Telecom Product Datasheets contain an Applications Diagram. This shows

Silver Telecom Product Datasheets contain an Applications Diagram. This shows the electrical connections and typical values of

TEST CIRCUITS FOR PSTN INTERFACES Silver Telecom Product Datasheets contain an Applications Diagram. This shows the electrical connections and typical values of external components required, when using our products. Always consult the datasheet before performing parametric testing. The basic parametric test circuits, used by Silver Telecom when testing PSTN Interfaces, are shown on the following pages. Note that the PSTN interface may be known as a COIC, DAA or FXO interface. This depends on the application in which it is used. ANX-TEST_PSTN-1v1.0 DC ELECTRICAL TESTS 5V -48V A 24ma DMa DMb VIN TIP 100nF + A 100uF GND 100nF 600R PSTN Interface VOUT + RING SW1 100uF LSC LC 24ma ~ 20 Hz RS F/R GND Test Circuit 1 ANX-TEST_PSTN-1v1.0 GND TRANSMIT GAIN TEST (2W TO 4W) -48V 24mA + TIP VIN 100uF 100nF GND ~ PSTN Interface 100nF + RING VOUT 100uF 24mA Test Circuit 2 Transmit Gain = 20 log ( VOUT / VT-R ) ANX-TEST_PSTN-1v1.0 VT-R (Z = 600R) RECEIVE GAIN TEST (4W TO 2W) -48V 24mA TIP VIN VR ~ + 100uF 100nF 600R PSTN Interface GND RING VOUT + 100uF 100nF 24mA Test Circuit 3 Receive Gain = 20 log (VT-R / VIN ) ANX-TEST_PSTN-1v1.0 CMESSAGE NOISE AT 4W AND 2W -48V 24mA TIP VIN 100uF 100nF GND + 600R PSTN Interface RING VOUT + 100uF 100nF 24mA Test Circuit 4 4W Noise = 20 log (VT-R / 0.775 ) NOTE: Measure VT-R with a Cmess filter. 2W Noise = 20 log (VOUT / 0.775 ) NOTE: Measure VOUT with a Cmess filter. ANX-TEST_PSTN-1v1.0 TRANS HYBRID LOSS -48V 24mA TIP VIN GND + 100uF 100nF 600R PSTN Interface RING VOUT + 100uF 100nF 24mA Test Circuit 5 Trans Hybrid Loss (THL) = 20 log (VOUT / VIN ) ANX-TEST_PSTN-1v1.0 RETURN LOSS TEST -48V 24mA VIN GND + TIP 100uF 100nF ~ 300R + RING VOUT 300R VRL PSTN Interface 100nF 600R 100uF 24mA Test Circuit 6 Return Loss = 20 log (2VRL / VS ) ANX-TEST_PSTN-1v1.0 VS (Z=600R) CMRR AND LONGITUDINAL TO METALLIC BALANCE TESTS -48V 24mA + TIP VIN 100uF 100nF PSTN Interface GND 300R + RING VOUT 300R 100uF 100nF 24mA Test Circuit 7 CMRR (LCTL) = 20 log (VOUT / VS ) Longitudinal To Metallic Balance (LCL) = 20 log (VT-R / VS ) ANX-TEST_PSTN-1v1.0 ~ V (Z = 600R) S METALLIC TO LONGITUDINAL BALANCE TEST -48V 24mA + TIP VIN 100uF 100nF PSTN Interface + VOUT 300R 300R RING 100nF 100uF 24mA Test Circuit 8 Metallic to Longitudinal Balance = 20 log (VCT / VT-R ) ANX-TEST_PSTN-1v1.0 510R V CT ~ VS (Z=600R)