User's Manual

ADCP-75-132 • Issue 2C • August 2006

Page 26

3.10.2 Phase Two – System Design

Determine forward and reverse path loss and then design for unity gain on the uplink

and maximum power out of the DRU on the downlink: The overall purpose of the

Digivance ICS is to transparently overcome attenuation losses, not to provide additional gain

beyond what is required to bring the signal to unity gain. Complete the following steps to

make this determination:

1. Determine the in-building reverse path (uplink) losses at typical operating frequencies

and distances from the subscriber handset (terminal) to the DRU. This information will

be used to determine the optimal uplink signal level to the outside world.

2. Determine the typical composite cell site Effective Radiated Power (ERP) into the

system. Calculate the interface adjustment required to feed the required downlink signal

level to the DHU in order to drive the DRU output signal at the desired level.

Determine the location of the DHU and its RF and AC power sources: Complete the

following steps to make this determination:

1. Determine where and how the DHU will be mounted.

2. Determine the location of the DHU AC power source.

3. Determine the RF source (local interface with BTS or remote interface with BTS through

donor antenna) for the DHU.

4. If local interface connection with the BTS is required, determine the distance to the

DHU.

5. If a remote interface connection with the BTS is required, determine what type of

antenna is needed and where it can be mounted.

6. Determine the attenuation or amplification requirements for the DHU to BTS interface.

Discuss the design of the Digivance ICS installation with building management and

engineering: Explain the proposed system design with building management and engineering

personnel and obtain final design approval prior to installation.

3.10.3 Phase Three – Installation

Use industry standard practices for cabling, installation, and powering to complete the

following:

1. Install the DHU as described in Section 3 of this manual and adjust the RF interface

levels based on the system design specifications. Additional information concerning the

DHU to BTS interface is provided in the Digivance ICS Remote Interface Unit User Manual

(ADCP-75-178) and in the Digivance ICS 800 and 1900 MHz High Power Conditioning

Panel User Manual (ADCP-75-175).

2. Install a DRU as described in the Digital Remote Unit Installation Instructions (ADCP -

75-112). If a donor antenna is used, install the DHU and RIU close to the donor antenna.