ADC Network Unit user manual Eniu Rear View with RJ-45 Connector Power Connection

August 7, 2006 Chapter 2: Installation

Step Action

1Using AWG 16 (1.25mm) solid copper wire, connect one end of the ground wire to the ground stud at the back of the ENIU (shown in Figure 2-2 on page 2-3). Tighten the stud nut to 15 pound-force inches (1.7 Newton meters) of torque.

2To assure proper operation, the ground stud must be connected to a good earth ground.

3Connect the other end of the ground wire to the office ground conductor. Ensure this connection is made using methods and hardware that meets all applicable local and national electrical codes.

20382-A

Figure 2-2. ENIU Rear View with RJ-45 Connector

Power Connection

Following local practices, attach two pair of power supply wires from two separate power sources to the four pin power plug (pair 1: -48 VDC-A, RETURN-A and pair 2: -48 VDC-B, RETURN-B) on the chassis backplane (see Figure 2-3for details).

RETURN-A -48 VDC-A RETURN-B -48 VDC-B

RTN -48 VDC	RTN -48 VDC
POWER SOURCE	POWER SOURCE
A	B

20477-A

Figure 2-3. Four-Pin Power Plug Wiring Diagram

Separately fuse each -48 VDC power source, but do not install fuses now. Recommended wire size is 20 AWG (0.8 mm). This recommendation applies to wiring from the ENIU to a fuse panel using solid conductors. Fuse size should not exceed recommendation (see Appendix A: Specifications for fuse size). Plug the power plug into the power connector located on the back of the ENIU.

AIWN-UM-7001-01 2-3