PCM tester

Description

PCM tester performance Characteristics Full path A-A (Analog - Analog) test · Test Port: Second line or forth line audio interface · Second line port has feeding and loop circuit maintenance functions. · Output, Input Resistance: **0Ω; Multiple resistances · Test Items: Point power level, frequency characteristic, power level characteristic, idle noise, inter channel crosstalk, quantizing distortion · Near-end loop test and elsewhere relative test can be done automatically and up to ***0 lines of test record can be stored automatically in computer, only 1 minute is needed to finish a line of speech channel test. · Auto comparison with ITU-T suggested and analyzed result during test, real-time report when under guideline, marked identification on record and graphic model display of test result · Operation modes of manual test, monomial or multinomial auto test, auto tests of all items are provided · Sending sinusoidal signal frequency range is ******0Hz, step length is 1Hz, frequency inaccuracy is less than 0.2Hz, frequency characteristic inaccuracy is less than 0.1dB · Signal Rated Output Range is **2.5**1dBm, Operation Inaccuracy is less than 0.1dB Semi-path A-D D-A D-D Test · 2M digital output port can output codes of **9*3dBm ******0Hz digital sinusoidal sequence, speech channel Signaling ABCD code can be set randomly, Output Code Pattern: Code HDB, Output Resistance: *5Ω, unbalanced · 2M digital input port can test A-D, D-A, D-D speech channel characteristics with inaccuracy less than 0.*5dB. Input Code Pattern: Code HDB3, Input Resistance: high resistance2KΩ, unbalanced · Semi-path test has full functions of all access test except for the auto relative test · Test can be implemented at any speech channel slot time with speech channel signaling ABCD code monitored in real time · Sound and light alarm when no signal, AIS, frame desynchronizing, CRC4 desynchronizing occur