User's Manual Part 1

ADCP-75-187 • Preliminary Issue 1B • November 2005 • Section 1: OVERVIEW
Page 1-3
© 2005, ADC Telecommunications, Inc.
2.2 Enhanced Base Transceiver Station Interface
The HU is interfaced with an EBTS over coaxial cables as shown in Figure 1-2. The EBTS
provides the RF channel inputs and outputs for a designated sector. In the forward path, the HU
receives two RF inputs from the EBTS. The HU digitizes the RF spectrum and then converts it
to digital optical signals for transport to the RU. In the reverse path, the HU receives digital
optical signals from the RU. The HU converts the digital optical signals back to two RF outputs
which are supplied to the EBTS over the coaxial cable interface.
Figure 1-2. EBTS/HU Interface
2.3 Subscriber Unit Interface
The RU interfaces with the subscriber units (cell phones) through an antenna. In the reverse
path, the RU receives RF spectrum from each subscriber unit (see Figure 1-1). The RU digitizes
the RF spectrum and then converts it to digital optical signals for transport to the HU over the
optical fiber link. In the forward path, the RU receives digital optical signals from the HU. The
RU converts the optical signals to RF spectrum for transmission to the subscriber units. The RU
is connected to an antenna (not provided) which transmits and receives the subscriber unit RF
spectrum.
2.4 Local Management Interface
Communications with an individual Digivance system is supported through a local management
interface capability as shown in Figure 1-3. A local management interface requires a PC-type
computer loaded with the Digivance Element Management System (EMS) software. EMS
provides the various control and monitoring functions required to locally manage a Digivance
system. The EMS computer connects directly to the HU through the computer’s RS-232 port.
Operation is implemented through the EMS Graphical User Interface (GUI). The GUI consists
of a series of screens from which the user selects the desired option or function. An RS-232
service port is provided on both the HU for connecting the EMS computer.
20856-A
HOST UNIT
RF
ENHANCED
BASE
TRANSCEIVER
STATION
FORWARD
PATHS
REVERSE
PATHS