ADC HRM-238 L1 Manuel D’Utilisation

Remove the fuse(s) in the equipment bay fuse panel for the circuit(s) where the HRM-238 shelf battery 
wire(s) will terminate.

Connect one end of the frame ground wire to Terminal 4 (FGND) on TB1 of the HRM-238 shelf and attach 
the other end of the frame ground wire to the CO ground wire termination point.

Connect the -48 Vdc CO battery to the HRM-238 shelf (

Connect a wire to the HRM-238 shelf TB1 Terminal 1 (-48V_A) for Primary CO battery.

Connect a wire to the HRM-238 shelf TB1 Terminal 2 (-48V_B) for Redundant CO battery.

Connect the battery common wire to HRM-238 shelf TB1 Terminal 3 (BATTERY RETURN) of the 
HRM-238 shelf and attach the other end to CO battery ground source(s).

Connect the wire(s) from the HRM-238 TB1 Terminal 1 and Terminal 2 to the CO -48 Vdc power 
termination point(s).

All wiring and connections for the HRM-238 shelf are on the back. 

 shows the shelf backplane 

and connectors. Connect the NMA wiring from the HRM-238 shelf to each HiGain or Megabit Modem line unit 
that will be managed using the steps beginning on 

. Then, use the other connectors in 

 and 

appropriate for your application.

1

-48V_A

2

-48V_B

3

BATTERY RETURN

4

FGND

Terminal 1
to -48 Vdc

H0547-B

Terminal 4 to
frame ground (FGND)

Terminal 2
to -48 Vdc

Terminal 3 to battery
common (Battery Return)