SSG 500 M Series Hardware Installation and Configuration Guide
22  Back Panel
DC Power Supply Unit
The fixed DC PSU faceplate for an SSG 520M device contains an ejector tab, an 
input power light, and two DC power terminal blocks that connect to power cables. 
Figure 16:  SSG 520M Device Fixed DC PSU Faceplate
The field-replaceable DC PSU faceplate contains an ejector tab, a handle, an input 
power light, and two DC power terminal blocks that connect to power cables.
Figure 17:  SSG 550M Device Replaceable DC PSU Faceplate
Grounding Lug
A two-hole grounding lug is provided on the left rear of the chassis to connect the 
device to earth ground (see Figure 13 on page 20).
To ground the device before connecting power, you connect a grounding cable to 
earth ground and then attach the cable to the lug on the rear of the chassis. For 
more information, see “Chassis Grounding” on page 26.
-48V
RTN
Ejector tab
DC power 
terminal 
blocks
Input 
power light
-48V
RTN
Ejector tab
DC power 
terminal 
blocks
Handle
Input 
power light