Longitudinal balance : The longitudinal balance at ATU-C and ATU-R is greater than 40 dB over the 5 kHz to 1104 kHz frequency range.•DC characteristics
Connectors PSTN Line : The PSTN line is the PIJF cable with 0.5 copper pairs.
Return loss : The return loss of Tele port and line port against 600 Ohms is 200Hz -3400Hz = 12 dB
Longitudinal balance of POTS splitter : The balance is greater than 58 dB for frequency between 200 Hz - 1 kHz with a straight line-level decreasing to 53 dB at 3 kHz.
Loop Current : The maximum loop current drawn from exchange is less than 60 mA.
Isolation : Isolation resistance between tip, ring and between earth = 10 Mega-ohms. Isolation resistance with line port = 10 Mega-ohms.
Unbalance about earth : : 25Hz-50 Hz > 40 db terminated with 600hms.50Hz- 600 Hz > 46 db terminated with 600 Ohms.600Hz-3400Hz > 52db terminated with 600ohms.
ADSL-band Return Loss : The return loss caused by loading the low-pass filter in the band from 25 kHz to 1104 kHz against the reference impedance of 100 ohms is greater than 14dB.
ADSL-band attenuation : The insertion loss of low-pass filter is greater than 65dB at CO POTS and 70dB in remote POTS for frequencies ranging from 25 to 300 KHz with an input level of 10dBm. For frequencies ranging from 300 kHz to 1104 kHz, the attenuation is greater than 55dB f
Signal Power : Maximum peak signal power in 200-4000Hz is <3dbm. Loop current is <63mA.