EXPRESS DAS
Installation and Operations Manual
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EXPRESS DAS Installation and Operations Manual – Version 2.2 November 2013
4.2.1
Donor Optic Unit (DOU)
Within the ODU, converting RF signals to optical signals and back again is the job of the Donor Optic
Units (DOUs). Each ODU can support up to two DOUs. Each DOU supports four optical ports, providing
connections for up to eight MRUs.
The DOU uses an optic splitter to divide the optical signals into four separate signals and then distributes
each to an optical port. For the uplink path, it makes the optical-electronic conversion of signals received
from each optical port. The unit can perform attenuation (ATT) for optical compensation in the case of
optical loss in the fiber or fiber connectors. Because of the internal Wavelength Division Multiplexing
(WDM) capability, only one optical cable is required for the connection to each MRU. An internal FSK
modem allows communication from remote sites.
Figure 4.3 – DOU at a Glance
Содержание EXPRESS Single-Carrier DAS
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