User's Manual

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Note that OEU does not operate if the “+” terminal and the “–“ terminal of the -48V
power are not inserted into the accurate polarity.
5.4.3 OEU Optic Cabling
OEU is connected with upper ODU. With DOU inserted in it, the unit is connected with ROU.
As OEU has a shelf with EWDM in it, the unit makes electronic-optical conversion of TX signals
from ODU and makes optical-electronic conversion of RX signals. In addition, OEU can be
equipped with up to two DOUs. One DOU supports four optical ports and one optical port can
be connected with ROU. With WDM in DOU, the unit can concurrently send/receive two pieces
of wavelength (TX:1310nm, RX:1550nm) through one optical core. DOU has SC/APC of optical
adaptor type.
Figure 5.7 – Optical cable of SC/ACP Type