
VF / DSL Cable Qualifier
210
If the line card is not connected or is not detectable by the CableSHARK, the Ground Resistance test
displays the following screen.
MAIN
MENU
EF
CHG
SAVE /
UPLOAD
Line card = not detected
TEST
SETUP
F
IGURE 13.2.4B – LINE CARD NOT DETECTED
The Ground Resistance measurement is executed in the following fashion.
1. Measure the open loop (on hook) tip-ring voltage (Station voltage). The voltage must be negative. If
not an error message reporting “Tip & Ring polarity reversed” will be displayed.
2. The CableSHARK will detect the balanced-unbalanced source (on hook) by measuring the ring-
ground voltage. For a grounded system it must be ≤5 V. If the ring-ground voltage is ≥5 V, the line
is balanced.
3. The CableSHARK measures the loop current (off hook) by seizing the line with a 435 ohm internal
load
4. For the constant voltage sources, the CableSHARK measures the tip-ring voltage (off hook) with
the 435 ohm load.
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