Ground Fault Detect - ADC HiGain H2TU-C-202 User Manual

152-202-116-02, Issue 2
G F
ROUND AULT
The H2TU-C has a Ground Fault Detect (GFD) circuit which detects a ground or a resistive path to ground on any
wire of any span in the loop with a non-zero voltage. GFD is always active in HDSL2 because power is fixed at
-185 Vdc.
When the circuit is active, the system is compliant with Class A2 requirements of GR-1089. When the circuit is
not active, the system is compliant with Class A3 requirements of GR-1089.
When the GFD circuit detects a grounded loop, the line power is immediately removed from the spans and a PWR
FEED GND alarm is generated and displayed. The power is reapplied 30 seconds later as part of a new start-up
procedure. If the ground condition persists on the span, the power is removed again once the GFD circuit detects
the grounded loop.
The indication of the location of the ground fault can be obtained by monitoring the voltages on the spans on the
H2TU-C side as it sequentially powers devices in subsequent spans.
H2TU-C-202 List 1F
D
ETECT
March 14, 2000
Appendix B - Functional Operation
55