Specifications
7-10 Cisco MGX 8220 Reference, Release 4.1
Rack Mounting the MGX 8220 Units
NoteThe shelf weighs 30 lbs to 60 lbs (13.6 kg to 27.2 kg) depending upon the number of installed
cards. Have two persons, one each side, lift the shelf into the rack. The lower modules can be used
as a temporary support for the shelf until the shelf is attached to the rack.
Center Mount
Where there is restricted depth in the rack, the holes in the side of the module can also be used to
mount the shelf with the center of the module mounted onto the front of the rack. In this arrangement,
the shelf will protrude from the front of the rack and only partially protrude into the rack space.
Limited Access
There are several aids for mounting modules where side access is limited.
1 Use thread forming screws to prethread mounting holes. This technique involves screwing a
screw into the hole to make the thread and then removing it before installing the module. The
pre-threaded holes make it much easier to insert the screws when the module is installed.
2 An alternative bracket can be used for the MGX 8220 shelf rear support. This bracket locks into
slots on the module chassis and does not specifically require screws in the chassis side. Ground
contacts are provided for a redundant ground connection.
3 Another alternative bracket, which is part of the cable management kit, has keyhole style holes
instead of the normal round holes. Using this bracket, the screws can be loosely screwed into the
chassis before it is installed. When the chassis is approximately in position in the rack, the bracket
is then placed over the screws and slid into place. The screws are tightened using a box end
wrench from the rear. The bracket is attached to the rack mounting rail. This bracket is used in
conjunction with a spacer to ensure the 1/32 inch vertical space between modules. Hex head
screws are provided for this purpose. (See Figure 7-5.)
4 An additional bracket is used to properly space the main MGX 8220 chassis unit when a rear
vertical mounting rail is not used in the assembly. Mount the cable hook on top of the bracket and
use a flat washer to space the lower mounting hole.