Pub. 42004-392G
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e:\standard ioms - current release\42004 instr. manuals\42004-392g.doc
09/14
Page Line Ground Fault Detection
DC resistance from either L1 or L2 to ground for fault ..................................................................
5,000
DC resistance from either L1 or L2 to ground for no fault .............................................................
8,000
Minimum ground fault duration for detection ............................................................. 10 seconds (nominal)
Minimum no ground fault duration for detection ........................................................ 10 seconds (nominal)
No ground fault to ground fault propagation delay ..............................
20 seconds includes detection time
Ground fault to no ground fault propagation delay ..............................
20 seconds includes detection time
N
OTE
:
Rapidly changing ground fault conditions may or may not be detected.
Page Line Ground Fault Generation
Resistance when generating ground fault .......................................................................... 3.3 k
(nominal)
Resistance when not generating ground fault ....................................................................................
1 M
N
OTE
:
The resistance is from the center tap of the page line coupling transformer to ground.
Party Line Off-hook detection
DC resistance between L1 and L2 for off-hook .................................................................................
300
DC resistance between L1 and L2 for on-hook ............................................................................
30,000
Minimum off-hook duration for detection ........................................................... 50 milliseconds (nominal)
Minimum on-hook duration for detection ...................................................................... 5 seconds (nominal)
On-hook to off-hook propagation delay ................................................
0.5 second includes detection time
Off-hook to on-hook propagation delay ...............................................
10 seconds includes detection time
N
OTE
:
Rapidly changing off-hook or on-hook conditions may or may not be detected.
Contact Outputs (using optional I/O kit)
Contact output type .......................................................................................... DPDT miniature signal relay
Switching power ....................................................................................................
30 W dc (resistive load)
62.5 VA ac (resistive load)
Switching voltage..........................................................................................................................
110 V dc
125 V ac
Switching current ................................................................................................................................
1.0 A
Minimum switching capacity ............................................................................. 10
A, 10 mV dc (nominal)
N
OTE
:
When neither the T1/E1 Link nor the LVDS link is detected, the contact outputs are de-energized.