User's Manual

ADCP-75-132 • Issue 2C • August 2006

Page 3

optical transport connection. With 62.5 micron core multi-mode fiber , the optical path may be

up to 500 meters in length. With 50 micron core multi-mode fiber, the optical path may be up

to 750 meters in length. With 9 micron core single-mode fiber, the optical path may be up to

10 kilometers in length. Single- and multi-mode fibers may be used in the same system. The

optical fibers must be terminated with duplex LC connectors for connection with the DHU,

DEU’s and DRU’s.

1.5 Capacity for Expansion and Extended Runs

The DEU enables 6-way expansion of any optical port. This makes it possible to add more

DRU’s without having to install additional DHU’s. Each DHU is equipped with six optical

ports. If more than six DRU’s are required by the application, a DEU may be connected to one

of the DHU optical ports which expands that port to six ports. If still more optical ports are

required, then a second DEU may be connected to the DHU; or a second DEU may be

connected to the first DEU. The ability to cascade DEU’s in parallel or in series provides

unlimited flexibility. It is physically possible to connect an unlimited number DRU’s to the

DHU through the installation of DEU’s. The maximum number of DRU’s that can connected

to the DHU is limited only by the cumulative noise effect caused by antenna combining.

1.6 Power Requirements

The DHU, DEU, and RIU are each powered by 120–240 VAC, 50/60 Hz, 2 Amp power which

is supplied through a standard three-conductor AC power cord. The DRU is powered by 34–

48 VDC which is supplied by either the DHU, DEU, or an AC/DC wall-mount style converter.

When the DRU is powered by the DHU or DEU, the power is fed through a category 3 or 5

cable terminated with male RJ-45 connectors.

1.7 Fault Detection and Alarm Reporting

LED indicators are provided on the front panel of the various units to indicate if the system is

normal or if a fault is detected. In addition, normally open and normally closed alarm contacts

(for both major and minor alarms) are provided at the DHU for connection to a customer

provided external alarm system. This could be a local system or automatic call-out system.

2 DIGTAL UNIT DESCRIPTION

This section provides a description of the functions and features provided by the units that comprise

the ICS system, a listing of terms used and their definition, and a table of specifications.

2.1 Digital Host Unit Description

The DHU, shown in Figure 2, serves as the BTS servicing unit for the Digivance ICS. The

DHU provides the following basic functions:

• RF inputs and outputs

• Optical interface to the DRU’s or DEU’s