7-10
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 i ns talled
cards. Have two persons, one each si de , li ft the shelf into the rack. The lowe r m od u les c an
be used as a temporary suppo r t f o r th e sh el f un t il th e s h el f is a ttached to the rack.
Center Mount
Where there is restricted dept h in the rack, the holes in the side o f the module can also be used to mo unt
the shelf with the center of the mod ule mounted onto the front of the r ack. 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 m o dule s where side access is limited.
1. Use thread forming screws to prethread mounting holes. This technique involves inserting a scre w
into the hole to make the threa d and t hen re mo vi ng it be for e inst al ling th e mo dule. The pr ethre ade d
holes make it much easier to i ns e rt th e s cr ews w h en th e 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 approxi mately in position in the rack, t he bracket
is then placed over the screws and slid into place. The screws are t ightened using a box end wrenc h
from the rear. The bracket is attached t o 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 provi ded
for this purpose. (See Figure7-5.)
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 lowe r m ou n ti ng h ol e.