Cisco Laser Link Return Digital Receiver with Ethernet Guida All'Installazione
2-2
Installation
78-4028521-01 Rev B
Laser Link III Mainframe Installation
Overview
This section provides step-by-step instructions for installing the Laser Link III
Mainframe and describes how to make electrical connections. For information on
installing modules in the mainframes, refer to the specific module manual.
For ease of installation and safety, keep the following in mind throughout this
For ease of installation and safety, keep the following in mind throughout this
procedure.
CAUTION:
Any time the mounting ears attached to the mainframe are moved (in order to
adjust the depth to which the mainframe is installed) or replaced (in order to
mount the mainframe in a 23-inch bay) the maximum allowable torque for
tightening the screws is 7 to 9 in-lbs. Failure to adhere to this caution may result
in equipment damage.
Elevated Operating Ambient
If the mainframe is installed in a closed or multi-unit rack assembly, the operating
If the mainframe is installed in a closed or multi-unit rack assembly, the operating
temperature inside the rack may become elevated. Use care to ensure that this
elevated temperature does not exceed the rated temperature for the unit.
Reduced Air Flow
When selecting a location to install the mainframe, follow these guidelines.
•
Reduced Air Flow
When selecting a location to install the mainframe, follow these guidelines.
•
A 1 RU (1.75-inch/4.4 cm) clearance above the uppermost mainframe in the rack is
required for ventilation.
•
A 1 RU (1.75-inch/4.4 cm) clearance is necessary if the product mounted above the
mainframe has a solid, flat bottom that would restrict airflow when placed directly
on top of the mainframe.
•
Additional mainframes may be directly racked on top of one another, as
ventilation space is integral to the mainframe. However, this particular
configuration does not allow access to, or removal of, the fan assembly.
•
An enclosed rack with side panels and rear doors installed will allow for “chimney
effect” airflow to occur. This type of airflow maximizes the convection cooling
characteristics of the mainframe.
Mechanical Loading
When mounting the mainframe in the rack, be aware that uneven loading could
When mounting the mainframe in the rack, be aware that uneven loading could
skew the center of gravity, resulting in a hazardous condition.