3-2
Cisco Catalyst 4900M Switch Installation Guide
78-18350-02
Chapter 3 Installing the Switch
Rack-Mounting the Switch
Rack-Mounting the Switch
A rack-mount kit (69-1821-03) is included in the accessory kit for mounting the switch in a standard
19-inch (48.3 cm) four-post equipment rack where the depth of the rack (the distance measured between
the front and the rear posts) does not exceed 32.5 inches (82.5 cm). This rack-mount kit is not suitable
for racks with obstructions (such as a power strip) that could impair access to the switch, four-post rack
enclosures that exceed 32.5 inches (82.5 cm) in depth, or for two-post equipment racks.
An optional rack-mounting kit (C4900M-BKTS-KIT=) is available for installing the chassis in two-post
telco racks and in four-post equipment racks that exceed 32.5 inches (82.5 cm) in depth.
CautionBefore installing the chassis in a rack, read the “Site Environmental Requirements” section on page 2-1
to become familiar with the proper site and environmental conditions. Failure to read and follow these
guidelines could lead to an unsuccessful installation and possible damage to the system and components.
CautionThis unit is meant to be rack-mounted, and is not intended to bear more than its own weight. Do not stack
more than two on a table top, the added weight may damage the bottom chassis.

Rack-Mounting Guidelines

Before rack-mounting the switch, ensure the following:
•The equipment rack is the proper size.
–
The width of the rack, between the two front mounting strips or rails, must be 17.75 inches
(45.09 cm).
–
The depth of the rack, between the front and rear mounting strips, must be at least 19.25 inches
(48.9 cm) but not more than 32.5 inches (82.5 cm).
NoteIf your four-post rack enclosure exceeds 32.5 inches (82.5 cm) in depth, or you are
installing the chassis in a two-post equipment rack, you must order and use the optional
rack-mount kit (C4900M-BKTS-KIT=).
Warning
To prevent bodily injury when mounting or servicing this unit in a rack, you must take special
precautions to ensure that the system remains stable. The following guidelines are provided to
ensure your safety:
•This unit should be mounted at the bottom of the rack if it is the only unit in the rack.
•When mounting this unit in a partially filled rack, load the rack from the bottom to the top with the heaviest
component at the bottom of the rack.
•If the rack is provided with stabilizing devices, install the stabilizers before mounting or servicing the unit in
the rack.
Statement 1006