Panasonic dBs Instructions d'exploitation télécharger pdf (Page 141)

Panasonic Digital Business System - Operating Instructions

March 1997 Issue 24

141

Combined Graph Of A and B Wire Voltages

Field measurements show that the voltage on cleardown is not constant. But rises exponentially towards the ‘talking’ levels

probably due to the exchange line impedance characteristics. Provided the A and B legs follow the same path there will be no

current flow ( as there is no potential difference between the wires ) and CPC should still function. If there is a difference

between the A and B legs then there will be current flow and hence unreliable or inoperative CPC. In such a case the problem

is network related and not a system fault. The following graphs, based on the previous examples show these situations.

Exponential Rise Equal On A And B - CPC Should Be OK

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Panasonic dBs Instructions d'exploitation Page 141