ADC Telecommunications Inc. DVICSRIU800 用户手册
ADCP-75-114 • Issue C • June 2001
Page 1
©
2001, ADC Telecommunications, Inc.
1 DESCRIPTION
This
section provides a complete description of the Remote Interface Unit (RIU).
1.1 Primary Functions and Components
The
RIU, shown in Figure 1, serves as the interfacing unit between a remote BTS and the
Digivance
DHU. The RIU provides the following basic functions:
•
RF
interface to the BTS (through donor antenna) and DHU
•
Gain
adjustments to the forward and reverse path RF signal
•
Duplexing
of the forward and reverse path RF signals
•
Alarm
reporting to an external alarm system
16650-A
FRONT PANEL
CABLE MANAGEMENT
TRAY
MOUNTING
BRACKET
(BOTH SIDES)
3.5 INCHES
(89 mm)
11.4 INCHES
(290 mm)
3.9 INCHES
(99 mm)
17.2 INCHES
(437 mm)
13.6 INCHES
(345 mm)
Figure 1. Remote Interface Unit
A
remote interface between the DHU and the BTS (cell site base station) via a donor antenna
requires
specific RF input and output signal levels at the DHU and antenna. The correct levels
at
the DHU and antenna can be provided using the RIU. The RIU provides adjustable gain in
both
the RF forward and reverse paths. The RIU connects to a directional antenna through a
duplexer
which provides separate forward and reverse path connections for the DHU. In the
forward
path (downlink), the RIU provides the recommended composite maximum RF input
signal
level at the DHU which is –20 dBm. When the level of the RF input signal at the DHU
is
–20 dBm, the level of the RF output signal at the DRU is +13 dBm which is the maximum
allowed.