HP A6604 Installation Manual page 59

Step5 Fix the router in the rack horizontally and firmly by fastening the mounting brackets onto the
rack posts with pan-head screws. The size of pan-head screws should satisfy the installation
requirements (maximally M6) and the surface of the screws should be anti-rust treated.
Figure 4-5 Install the A6608 in a rack
The A6604 and A6608 are very heavy. When installing an A6604/A6608 in a rack, you need to
install it on a support tray rather than the slide rails directly.
PGND Cable Connection
Importance of the PGND Cable
The correct connection of the protection ground (PGND) cable on the router chassis is an
essential safeguard against the lightning strokes and electromagnetic interference (EMI). You
need to correctly connect the PGND cable when installing or using the router.
The power input end of the device is equipped with a noise filter. The neutral ground of the
power input end is directly connected to the chassis and is called PGND (also known as chassis
ground). You need to securely connect the PGND cable to the earth ground to safely lead
induced current and leakage current to the ground and reduce the electromagnetic susceptibility