User's Manual

Confidential & Proprietary 21/59
4.1 HROU (High power Remote Optic Unit)
HROU consists of two unit, one is HMRU(High power Main Remote Unit) and the other is
HARU(High power Add-on Remote Unit).
The biggest difference between HMRU and HARU is whether R-OPTIC module exist or not.
HMRU receives TX optical signals from ODU or OEU and converts them into RF signals. The
converted RF signals are amplified through High Power Amp in a corresponding RDU combined
with RFU, PAU and Cavity duplexer, and then radiated to the antenna port.
When receiving RX signals through the antenna port, this unit filters out-of-band signals in a
corresponding RDU and sends the results to R-OPTIC to make electronic-optical conversion of
them. After converted, the signals are sent to a upper device of ODU or OEU. HMRU can be
equipped with up to two RDUs (Remote Drive Unit) and the module supports single band only.
HARU receives TX RF signal from HMRU and amplifies through High Power Amp in a
corresponding RDU combined with RFU, PAU and Cavity duplexer, and then radiated to the
antenna port
When receiving RX signals through the antenna port, RDU filters out-of band signal in a
corresponding RDU and sends the results to MHRU through RF cable.
360mm
700mm
670mm
30mm
280mm
280mm
500mm
Figure 4.1 – HROU Outer Look