 | General conditions Splitter bandwidth DC to 17.3 kHz Nominal voice band 300 Hz to 3.4 kHz Billing tone 12/16 kHz ± 1 % Ringing frequency 25 Hz to 50 Hz ADSL band 25 kHz to 2208 kHz Line Impedance Zreal(1) 200 Hz to 4 kHz 600 ohms CO impedance ZTc 200 Hz to 4 kHz 600 ohms RT impedance ZTr 200 Hz to 4 kHz 600 ohms Modem impedance 32 kHz to 2208 kHz 100 ohms Operation voltage voice band Nominal signal 21 mVp-p to 5.4 Vp-p Billing tone 10 Vp-p to 30.2 Vp-p Ringing signal 100 Vrms DC voltage 100 V Max. AC voltage 100 Vrms with 100 VDC offset Max. differential 250 V Operation current voice band DC Loop current < 100 mA DC requirements DC resistance The sum of A-wire and B-wire resistances from the LINE to the TELE port; term = 0 Ω < 25 ohms Isolation resistance, branch-earth 100 VDC; term = ∞ Ω > 20 Mohms Isolation resistance, branch-branch 100 VDC; term = ∞ Ω > 5 Mohms Voice band requirements Insertion loss (Zreal(1)) @ 1 kHz < 0.3 dB Splitter parameter Electrical requirements Range Values Insertion loss distortion (Zreal(1)) 200 Hz to 4 kHz (relative to 1 kHz) <± 1 dB Return loss at TELE port (Zreal(1)) 300 Hz to 500 Hz > 14 dB 500 Hz to 2000 Hz > 18 dB 2000 Hz to 3400 Hz > 14 dB Unbalance about earth (LCL & TCL) (Zreal(1)) 200 Hz to 1 kHz > 58 dB 1 kHz to 3 kHz > 53 dB Group delay distortion (Zreal(1)) 200 Hz to 600 Hz < 250 usec 600 Hz to 3.2 kHz < 200 usec 3.2 kHz to 4 kHz < 250 usec Intermodulation distortion products > 60 dB Frequencies and levels for pulse metering (in 200 Ω) 12/16 kHz ± 1 % <5 dB ADSL band requirements Stop band attenuation (Zreal(1) & ZRHF) 30 kHz to 138 kHz > 45 dB Stop band attenuation (Zreal(1) & ZRHF) 138 kHz to 2208 kHz > 55 dB Input impedance (loading of ADSL signal path) 32 kHz to 2208 kHz < 0.25 dB |
