User Manual

ADCP-75-110 • Issue 2B • July 2001
Page 29
© 2001, ADC Telecommunications, Inc.
ALIGN DIP SWITCH HANDLES AS
SHOWN ON THE LABEL TO PROVIDE
SPECIFIED FREQUENCY BAND
Fig 13-A
Figure 14. 1900 MHz DHU Frequency Band Selection
3.5 Mounting Procedure
The DHU may be either rack-mounted or wall-mounted. Of the procedures that follow, use
which ever procedure is appropriate for the installation:
Note: To insure that all optical connectors and transceivers remain dust-free during
installation, leave all dust caps and dust protectors in place until directed to remove
them for connection.
3.5.1 Rack Mount Installation
The DHU may be mounted in either a 19-inch or 23-inch EIA or WECO equipment rack. Both
US standard and metric machine screws are included for rack mounting the DHU. When
loading the DHU in a rack, make sure the mechanical loading of the rack is even to avoid a
hazardous condition such as a severely unbalanced rack. The rack should safely support the
combined weight of all the equipment it holds. In addition, the maximum recommended
ambient temperature for the DHU is 50º C (122º F). Allow sufficient air circulation or space
between units when the DHU is installed in a multi-unit rack assembly because the operating
ambient temperature of the rack environment might be greater than room ambient.
Warning: Wet conditions increase the potential for receiving an electrical shock when
installing or using electrically-powered equipment. To prevent electrical shock, never install
or use electrical equipment in a wet location or during a lightning storm.
Use the following procedure to install the DHU in the equipment rack:
1. The DHU is shipped with the mounting brackets installed for 19-inch rack installations.
If mounting the DHU in a 19-inch rack, proceed to step 4. If mounting the DHU in a 23-
inch rack, proceed to step 2.
2. Remove both mounting brackets from the DHU (requires TORX screwdriver with T20 bit)