User's Manual

ADCP-75-132 • Issue 2C • August 2006

Page 29

The following materials are required in order to complete the procedures in this section:

• Wall-mount fasteners (wall-mount applications only)

• #22 AWG (0.40 mm) category 3 or 5 cable (for power cable and external alarm connections)

• RJ-45 male connectors (for power cable)

• #18 AWG (1.00 mm) insulated stranded copper wire (for chassis grounding wire)

• Ring terminal for #18 wire (for chassis ground wire connection)

• 50 or 62.5 micron core multi-mode or 9 micron core single-mode fiber optic cable

• LC-type field installable connectors

• High performance, flexible, low loss 50-ohm coaxial cable

• N-type male connectors

• Wire ties

4.3 Unpacking and Inspection

This subsection provides instructions for opening the shipping boxes, verifying that all parts

have been received, and verifying that no shipping damage has occurred. Use the following

procedure to unpack and inspect the DHU:

1. Open the shipping carton and carefully unpack the DHU from the protective packing

material.

2. Check the DHU for broken or missing parts. If there are any damages, contact ADC (see

Section 6 at the end of this manual) for an RMA (Return Material Authorization) and to

reorder if replacement is required.

4.4 Frequency Band Selection Procedure

The 1900 MHz version of the DHU may be configured to operate at any one of four frequency

bands. A DIP switch is provided on the underside of the DHU for selecting the required

frequency band. Use the following procedure to set the DIP switch to provide the required

1900 MHz frequency band:

1. Determine the required frequency band for the DHU (AD, DBE, BEF, or EFC) as

specified in the system design plan.

2. Orient the DHU as shown in Figure 13 and then locate the small hole in the bottom of

the DHU that provides access to the band select DIP switch.

3. Use a non-conductive probe to align the DIP switch sliding handles to provide the

required frequency band (see Figure 13).

Caution: The DIP switches on the connected DRU’s must be set to the same frequency band as the

DHU. Any DRU that is set to a different frequency than the DHU will not function properly.

4. Place the copper sticker provided with the DHU over the small opening that provides

access to the DIP switch.

Note: The copper sticker provides EMI/RFI shielding. Do not use some other type of material

to cover the DIP switch access hole.