User's Manual

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When you connect 2-column, 15-pin D-SUB Signal cable from BIU and install DOU, LED on the
front panel is lit. Through this LED, you can check state values of LD and PD of DOU.
5.2.3 ODU Optic Cabling
As optical module shelf, ODU makes electronic-optical conversion of TX signals and then
makes optical-electronic conversion of RX signals. ODU can be equipped with up to two DOUs.
One DOU supports four optical ports and one optical port can be connected with ROU.
Optionally, only optical port 4 can be connected with OEU.
As WDM is installed in DOU, the unit can concurrently send and receive two pieces of
wavelength (TX:1310nm, RX:1550nm) through one optical core. DOU has SC/APC of optical
adaptor type.
Figure 5.4 – Optical cable of SC/ACP Type
For optical adaptor, SC/APC type should be used. To prevent the optical access part from being
marred with dirt, it should be covered with a cap during move. When devices are connected
through optical cables, you need to clear them using alcohocol to remove dirt.
5.2.4 Insert DOU to ODU
In an ODU Shelf, up to two DOUs can be installed. DOU module is in Plug in Play type.
When you insert DOU in ODU, insert the unit into the left DOU1 slot first. You can be careful as
the number is silk printed at the left.
The following figure shows installation diagram of ODU with one DOU inserted in it.