User's Manual

Confidential & Proprietary 33/139
Figure 4.8 – Rear panel Outer Look
Item Description
1. External ALM Port Input/output terminal for dry contact
2. GSM Modem Port GSM Modem terminal for upper network (Optional)
3. V/UHF I/O Port RF signal interface terminal of VHF&UHF
4. ODU I/O Port RF signal interface terminal for ODU
5. ODU signal Port Power and signal interface terminal for ODU
6. BTS/BDA I/O Port Input/output interface terminal of BTS/BDA
7. GND Port System ground terminal
8. DC Input Port Input terminal for DC -48V
4.2 ODU (Optic distribution Unit)
ODU receives TX RF signals from upper BIU and converts them into optical signals. The optical
signals are sent to ROU through optical cables. This unit converts optical signals from ROU into
RF signals and sends the converted signals to BIU.
For each shelf of the ODU, up to two DOUs (Donor Optic Unit) can be installed in it.
One DOU is supported with four optical ports. Therefore, one ODU can be connected with eight
ROUs.
Up to four ODUs can be connected with BIU.