EXPRESS DAS
Installation and Operations Manual
EXPRESS DAS Installation and Operations Manual – Version 2.2 November 2013
33
5
Remote Units – MRU, ARU, VHF/UHF AOR
The Main Remote Unit (MRU) receives downlink (Tx) optical signals from the ODU and converts them to
RF signals. The MRU amplifies the converted RF signals, combines them, and then delivers them to the
antenna port. When receiving uplink (Rx) signals through the antenna port, the unit filters out-of-band
signals, converts the RF signal to optical, then sends them to the ODU (or optional OEU).
The MRU comes in both single band and dual-band configurations. The optional Add-on Remote Unit
(ARU) only comes in dual-band configurations. In addition, a VHF/UHF Add on Remote (AOR) is available to
support the 450MHz
UHF and 150MHz VHF bands. (See the table on page 12 for currently supported
bands.)
Because the MRU provides the connection to the ODU at the headend and to the antenna, this unit is
required in every configuration. The ARU and VHF/UHF AOR are optional add-on units and only required
to support specific bands. The ARU and AOR perform many of the same services as the MRU, but do not
contain an optical module or connection to the antenna. As an exception, the UHF/WHF AOR requires a
separate antenna connected to the unit.
Figure 5
.
1 – MRU/ARU Block Diagram
Содержание EXPRESS Single-Carrier DAS
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