Hardware Technical Reference Manual
ONS DC Supervision Parameters
LA
2
600 ohms 600 ohms
EU
3
270R+(750R||150nF) 270R+(750R||150nF)
1. The UK ASU is used in the United Kingdom and New Zealand.
2. The LA ASU is used in Latin America, including Brazil.
3. The EU ASU is used in Australia, France, German, Italy, Netherlands, Portugal, and Spain.
Table 60: DC Supervision Parameters
DC Supervision Parameters
Battery Feed -30 Vdc feed, constant current set at 25 mA ± 1 mA
Loop Resistance 600 ohms (includes set)
Loop-Detect Threshold 12 mA
Flash Detect SW timed function from switch hook detector
Ground button detect threshold 13 mA Tip or Ring to ground in off hook state
Positive Disconnect SW timed function that breaks loop current
Table 59: Transmission Parameters
ASU variant Input Impedance Balance Impedance
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