Specifications
ONS Lines
Protected ONS Lines
Protected ONS ports (ONSP) are available on
• ports 1 and 2 on the CX/CXi Controller with AMB Version III
• ports 1 and 2 on the MXe Controller (PN 50005090) with AMB Version III.
The ONSP ports are suitable for off-premise applications, and meet the requirements of
60950-01 and IEC 55-24. Regular ONS ports are intended for on-premise applications only.
ONSP ports use the same loss plan settings as regular ONS ports.
Table 17: ONS Circuit Specifications
Parameter Value
Number of Circuits per Card: 2 (MX) and 4 (CX/CXi)
Loop Detector Threshold: 2000 ohms
On-hook Tip/Ring Voltage -48 Vdc nominal
External Loop Resistance 600 ohms maximum
Nominal Ringing Voltage 55 Vrms with 10 Vdc offset
External Loop Length:
22 AWG (23 IWG)
24 AWG (25 IWG)
26 AWG (27 IWG)
12,350 ft. (3800 m) with 200 ohm phone
7550 ft. (2300 m) with 200 ohm phone
4875 ft. (1500 m) with 200 ohm phone
Table 18: ONS Circuit Impedance Values
Territory
Balance Network
Setting
(ONS/OPS Circuit
Assignment form)
ONS Impedances
Ringing
Frequency
AC Balance
NA/LA 600 600 ohms 600 ohms 20 Hz
UK/EU
(except for
France)
Complex 270R+(750R||150nF) 270R+(750R||150nF) 25 Hz
France Complex 270R+(750R||150nF) 270R+(750R||150nF) 50 Hz
Australia Complex 220R+(820R||120nF) 220R+(820R||120nF) 25 Hz
New Zealand Complex 300R+(1000R||220nF) 370R+(620R||310nF) 25 Hz
China Complex
200R+(560//100nF) 200R+(560//100nF)
25 Hz
Brazil Complex 900R 900R+(50nF) 20 Hz
Notes: UK/EU parameters apply to Germany, Italy, Netherlands, Portugal, and Spain.
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