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
Loop Current : The maximum loop current drawn from exchange is less than 60 mA.
Signal Power : Maximum peak signal power in 200-4000Hz is <3dbm. Loop current is <63mA.
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
Metering Pulse : The metering pulse after passing through DSLAM is available at the interface with frequency 16 KHz ± 1%. The distortion is not more than 10% and the level is minimum 500 mV rms ± 10%. The interface will work independent of polarity reversal.
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.
Isolation : Isolation resistance between tip, ring and between earth = 10 Mega-ohms. Isolation resistance with line port = 10 Mega-ohms.
The ringing voltage : Generated / detected at the subscriber unit is at least 40 V rms with frequency as 25 +/ - 3Hz. The Ringing voltage is generated by the DSLAM is 75V rms with frequency as 25 + / - 3Hz
Insertion Loss : The tele-port to Line port insertion loss is < 1 db at 1 KHz for 600 Ohms.
Return loss : The return loss of Tele port and line port against 600 Ohms is 200Hz -3400Hz = 12 dB
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