ISDN ANALYZER D1080 - messkom.de
ISDN ANALYZER D1080 - messkom.de
ISDN ANALYZER D1080 - messkom.de
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<strong>ISDN</strong> <strong>ANALYZER</strong> <strong>D1080</strong> USER’S MANUAL REV. 5<br />
9.1.5. Line resistance measurement<br />
To measure the resistance of the tested line, select the R field and<br />
press (MEASUREMENT). The instrument absorbs two fixed<br />
currents ranging from 5 to 20mA and displays the resistance<br />
value. This value is reset either by starting another measurement<br />
or when the conditions for a ‘cold’ activation are present (see<br />
Paragraph 9.1.2).<br />
The R field displays one hyphen during the measurement. If the<br />
measurement cannot be executed, a question mark appears. This<br />
can be due either to high line resistance values or to energy<br />
consumption problems from the network (exchanges are equipped<br />
with current limiting <strong>de</strong>vices connected in series to each binding).<br />
Three hyphens are displayed for resistance values higher than<br />
1000Ω.<br />
78<br />
! The maximum line resistance is approx. 1000Ω for NT<br />
plugs and 700Ω for NT1-Plus plugs with exchange<br />
voltage of 66V. This is true for exchanges with noload<br />
line voltage of about 66V.<br />
CHAPTER 9. “U” INTERFACE
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