ADC 19717-A - Manual (Page 10)

ADCP-75-169 • Issue 1 • June 2004
Page 2
© 2004, ADC Telecommunications, Inc.
2.2 RF Signal Connections
The RF signal connections between the HU and the EBTS are supported through either two
(non-diversity unit) or three (diversity unit) N-type female connectors. On non-diversity units,
one connector is used for the forward path RF signal. The other connector is used for the reverse
path RF signal. On diversity units, a third connector is used for the diversity path RF signal. In
installations where multiple EBTS’s will be connected to a single HU, it will usually be
necessary to install a Primary Interface Panel and an Expansion Panel (accessory items) to
support the interface between the HU and the EBTS. The HU should be as close as possible to
the EBTS to minimize cable losses.
2.3 Optical Connection
Optical connections between the HU and the RU (STM) are supported through either two (non-
diversity unit) or three (diversity unit) SC-type optical connector ports. On non-diversity units,
one port is used for connecting the forward path optical signal and the other port is used for
connecting the primary reverse path optical signal. On diversity units, a third optical port is used
for connecting the diversity reverse path optical signal.
2.4 Controller Area Network Interface Connection
Controller Area Network (CAN) interface connections between multiple HU’s are supported by
a pair of RJ-45 jacks. One of the jacks is designated as the network IN port and the other jack is
designated as the network OUT port. The CAN interface allows up to 24 HU’s to be connected
together (in daisy-chain fashion) and controlled through a single EMS computer.
2.5 Service Interface Connection
The service interface connection between the HU and the EMS computer is supported by a
single DB-9 female connector. The service connector provides an RS-232 DTE interface. When
multiple HU’s are networked together, the supporting EMS computer may be connected to the
service connector of any one of the networked HU’s.
2.6 Powering
The HU is powered by ± 21 to ± 60 VDC power (nominal ± 24 or ± 48 VDC) . The power is fed to
the HU through a screw-down type terminal strip located on the rear side of the unit. Power to
the HU must be supplied through a fuse panel such as the PowerWorx 20-position GMT fuse
panel (available separately). The power circuit for each HU must be protected with a 3 Amp
GMT fuse. An On/Off switch is provided on the HU front panel.
2.7 User Interface
The HU user interface consists of the various connectors, switches, terminals, and LEDs that are
provided on the HU front and rear panels. The HU user interface points are indicated in
Figure 2
and described in Table 1 .