7 Voltage measurement (U= and U~)
ARGUS Copper Box
39
Example measurements:
The measured DC voltage of 48.90 V can
indicate the POTS access of a PBX.
Typical POTS PBX voltages are 48 V,
32 V or 24 V DC.
The measured DC voltage of 96.2 V can
indicate an ISDN-BRI U access.
The voltage for an ISDN-BRI U access is
normally between 91 V and 99 V.
The measured voltage of 60.93 V could
indicate an POTS access.
The normal voltage range of an POTS
access is between 50 V and 72 V.
