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Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Chapter5 Installing the Cisco MGX Switch or Gateway
Installing the MGX 8830 or MGX 8830/B Switch
Figure5-82 Polarities at the MGX 8830 PEM Pluggable Terminal Block
Step4 Locate the wiring block for TB1.
Figure 5-83 illustrates the TB1 wiring block (that is, the mating plug that attaches to TB1).
Figure5-83 Pluggable Terminal Block on MGX 8830 DC PEM
Step5 Insert and secure the stripped ends of the 10 AWG wire in the wiring block as shown in Figure 5-82 and
Figure 5-83. Figure 5-83 shows the assembly with an example wire and the screw that secures it in the
pluggable wire block.
Step6 Plug the pluggable terminal block to the receptacle TB1 on the DC PEM.
Step7 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 g round 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.
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-48 VDC
-48 VDC
return
Safety
ground
10 AWG
or 4 sq. mm.
–48 VDC Return
Safety ground
–48 VDC
3
2
1
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