Digital Test Access Line Testing For Star Module Isdn Lines - Nortel DMS-100 Series Maintenance Manual

7-36 Star Remote System manual maintenance
following table identifies the types of measurements and the capabilities of
these tests.
Table 7-17 LMU loop measurement capabilities
Type of test
dc foreign voltage
measurements
ac foreign voltage
measurements
dc resistance
measurements
Capacitance
measurements

Digital test access line testing for Star Module ISDN lines

Digital test access (DTA) is a method of digital monitoring of ISDN lines.
DTA provides a refined method of accessing the subscriber loop information.
297-8353-550 Standard 05.01 March 2001
Function
Test mode
Range
Accuracy
Input resistance
Test mode
Range
Accuracy
Input impedance
Test mode
Range and accuracy
• 10Ω to 100 k
• 10 kΩ to 1 MΩ
• 1 MΩ to 5 MΩ
dc immunity
ac immunity
Test mode
Range and accuracy10
nF to 5 µ F
dc immunity
ac immunity
Range or capability
Two terminal (tip to ground, ring to ground)
± 100 V
0.2 VRMS ± 5% (whichever is greater)
100 kΩ
Test terminal (tip to ground, ring to ground)
0 to 150 VRMS, single frequency of 20 to 60
Hz
0.2 VRMS ± 5% (whichever is greater)
100 kΩ with parallel capacitance of 100 pF
Three terminal (tip to ring, tip to ground, ring
to ground)
± 2Ω or 5% (whichever is greater)
•
± 2%
•
± 5%
•
± 6 V
10 VRMS, single frequency from 20 to 60 Hz
Three terminal (tip to ring, tip to ground, ring
to ground)
± 2 nF or 5% (whichever is greater)
± 6 V
10 VRMS, single frequency from 20 to 60 Hz