Transcription of 通信用伝送ケーブルの伝送 ... - cis1.c.dendai.ac.jp
1 [dB] 0[dBm] [dBm] [dB] [dB] [dBm] 1[mW] a, b [../cm] GND ]dBm[20[mW]1]mW[ 500m 4km 1km 500m 4km 4km 1km 500m 1km 2km 500m 100 1 7 4km 8
2 GND 7 8 , 15 c d e f 9 11 BAL(balanced cable) UNBAL(unbalanced cable) F 15 d 0dBm dBm ]mW[P 1mW ]mW[]mW[1log1010P 20dBm 0dBm 1mW 2345678910123456789101 4km500m1km2km3km0km 500m BAL 600 75 UNBAL 75 (2)
3 BAL UNBAL 75 100k 10k 10kHz 100kHz 10 MHz 20M 10M +10M 10 MHz 10 20 MHz 500Hz c d 10[dBm] 1 0[dBm] x [dBm] 0dBm 0[dBm] ( x [dBm])= x [dB] e f x[dB] [dB] (1) (2) ch1 EXT(ch3)ch2T T T ch1 ch2 EXT ch3 ( ) ( ) ( ) ( ) ( )
4 16 12 13 13 1 [bps] [bit/s] [Hz] EXT T T T NRZ 1 1V 0 0V 2 MHz 2 Mbps s 2N-1 N=9 +3dBm 2 MHz 2 Mbit/s 1bit s 500ns 1/N N[bit]
5 1 , N= 2 ch 0 0V 1 1V 1bit 500ns ch1 ch2 4bit GND GND 500ns/div 1 MHz 4 MHz 8 MHz 16 MHz , 2 MHz N 2 3 4 .. 1bit 1 (N-1)bit 0 0 bit bit 2N-1 2N-1[bit] 0 1 N= 9 ch2 0 1 , ( )
6 [dB/km] L [km] L [dB] (5) (5) L 2 2 n nifii,,2,1, i 2 niiiibffabaE12),( a, b a b aE bE zybxa 0 E a, b 1 a, b a b (5) a b
