Cisco Systems manual Dc Pem, Polarities at MGX 8230 PEM Pluggable Terminal Block

Chapter 4 Enclosure Installation

Rack Mounting an MGX 8230

Figure 4-9 Polarities at MGX 8230 PEM Pluggable Terminal Block

-48 VDC

return

Safety ground

-48 VDC

26265

1 2 3

Step 4 Locate the wiring block for TB1. Figure 4-10illustrates the TB1 wiring block (that is, the mating plug that attaches to TB1).

Figure 4-10 Pluggable Terminal Block on MGX 8230 PEM

1 2 3

26264

–48 VDC
	–48 VDC Return

Safety ground

10 AWG

or 4 sq. mm.

Step 5 Insert and secure the stripped ends of the 10 AWG wire in the wiring block as shown in Figure 4-9and Figure 4-10. Figure 4-10shows the assembly with an example wire and the screw that secures it in the pluggable wire block.

Step 6 Plug the pluggable terminal block to the receptacle TB1 on the PEM.

Step 7 If you have a redundant DC PEM installed in your MGX 8230, repeat step 1 through step 6 for the second

DC PEM.

Step 8 For each DC PEM, connect the DC input wiring to a separate dedicated DC source capable of supplying at least 30 Amps (typical). The –48VDC power source in the building should have a 30 Amp DC circuit breaker. The building’s wiring should include an easily accessible disconnect device. Make sure the safety ground wire connects to a reliable building (earth) ground.

Warning For personnel safety, the green or green/yellow wire must connect to safety (earth) ground at both the equipment and at the supply side of the DC wiring.

	Cisco MGX 8230 Edge Concentrator Installation and Configuration
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001		4-13