User Manual

ADCP-75-136 • Issue 1 • November 2002
Page 3
© 2002, ADC Telecommunications, Inc.
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 and DEU are each powered by 120–240 Vac (50–60 Hz) 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.