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Cisco MGX 8220 Installation and Configuration
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
Chapter
Rack-Mounting the MGX 8220 Units
Note The shelf weighs 30 lb to 60 lb (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
protrudes from the front of the rack and only partially protrudes 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 inserting a screw
into the hole to make the thread and then removing it before installing the module. The prethreaded
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 1/3- 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.