EXPRESS DAS
Installation and Operations Manual
50
EXPRESS DAS Installation and Operations Manual – Version 2.2 November 2013
6
Optic Expansion Unit (OEU)
The optional OEU is designed to connect a DAS throughout multiple buildings or structures across a
campus environment, and is
used primarily to drive multiple MRUs while limiting the amount of fiber
required. For example, when a signal is brought to another building, it utilizes existing fiber. To bring
service to multiple MRUs in another building would multiple strands of fiber. By utilizing the OEU, only
one strand of fiber is needed, thereby greatly reducing the amount of fiber required for these types of
configurations.
The OEU connects to the ODU, requiring only one ODU port and a single strand of fiber. It combines
downlink (Tx) signals received from the ODU and converts them to RF signals and sent to the MRU/ARUs
through fiber connections. Likewise, it receives RF signals from the MRU/ARU, converts them to optical
signals to send to the ODU.
The EXPRESS OEU can drive up to 8 MRUs. A maximum of two OEUs can be connected with the ODU,
and up to four OEU’s can be used with each BIU. The OEU uses the same Donor Optic Unit (DOU) as
the ODU, and like the ODU can support a maximum of two DOUs. The following block diagram shows the
OEU’s primary components, functions, inputs and outputs.
Figure 6
.
1 – OEU Block Diagram
Содержание EXPRESS Single-Carrier DAS
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