ADCP-75-110
•
Issue 2B
•
July 2001
Page 1
©
2001, ADC Telecommunications, Inc.
1 SYSTEM FUNCTIONAL OVERVIEW AND UNIT DESCRIPTION
This
section provides an overview of the Digivance Indoor Coverage Solution (ICS), a
description
of the functions and features provided by the units that comprise the system, a
listing
of terms used and their definition, and a table of specifications.
1.1 System Functional Overview
The
Digivance ICS is a digitally distributed antenna system that provides in-building coverage
for
analog (AMPS) or digital (TDMA or CDMA) cellular phone systems operating within the
800
and 1900 MHz frequency bands. Large buildings typically interfere with the transmission
or
reception of cellular phone system signals by imposing high attenuation losses on RF
signals.
The Digivance ICS is designed to overcome the attenuation losses that make cellular
communications
within buildings or structures difficult or impossible. With the Digivance
ICS,
cellular phone RF signals can be distributed to the interior areas of any building or
structure
to eliminate dead spots and improve reception.
1.1.1 Basic System Components
The
basic components of the Digivance ICS and their functions are shown in Figure 1. The
basic
system consists of the Digital Host Unit (DHU), Digital Remote Unit (DRU), and when
additional
capacity or longer fiber runs are required, the Digital Expansion Unit (DEU). In
addition,
two accessory items, the Local Interface Unit (LIU) and the Remote Interface Unit
(RIU)
may be used as needed to interface the DHU with the cellular system Base Transceiver
Station
(BTS).
1.1.2 Interface With BTS
The
DHU interfaces, either locally or remotely, with the BTS. As referenced in this
publication,
the BTS could be either a microcell or a cell site base station. When the BTS
(microcell)
is co-located with the DHU, a local interface over coaxial cable is possible. An
interface
device, such as the LIU, may be required to provide the proper input and output RF
signal
levels between the BTS and the DHU. When the BTS (cell site base station) is not co-
located
with the DHU, a remote interface using a donor antenna is required. An interface
device
such as the RIU is required to provide the proper input and output RF signal levels
between
the donor antenna and the DHU.
The
DHU interfaces, as described in the preceding paragraph, with the BTS. In the forward
path,
the DHU receives RF signals from the BTS. The DHU digitizes the RF signals and then
converts
them to digital optical signals for transport to the DEUs and DRUs. In the reverse
path,
the DHU receives digital optical signals from the DRUs and DEUs. The DHU converts
the
optical signals back to the original RF signal format for transmission to the BTS.
Summary of Contents for Digivance
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