Nokia 6800 Series - Manual (Page 59)

Chapter 3: EDH-6800-2 EDH Detection/Insertion Serial Distribution Amplifier Module Fault Reporting Output
32 6800/7000 Series - Distribution and Routing Products Installation and Operation Manual
Fault Reporting Output
The fault-reporting optically-isolated output is accessible at the rear RJ11
connector of the FR-680X series frame. RJ11 pins 3 and 4 are used as
negative and positive terminals respectively.
The output is open when no errors are occurring, is closed with frame
power removed, and pulses closed for the duration of a field with EDH
errors (as configured by the FF/AP jumper).
Figure 3-2 illustrates a basic interface:
Figure 3-2. Fault Reporting Output