Installation and Operation Manual

Confidential & Proprietary 14/57 Alliance-TR
1.1.1 HROU (High power Remote Optic Unit)
The HROU supports two types of remote units: High power Main Remote Unit (HMRU) and High power
Add-on Remote Unit (HARU). The biggest difference between HMRU and HARU is whether R-Optic module
exists or not in the enclosure. HMRU receives TX optical signals from the ODU. In the R-Optic module,
these optical signals are converted to RF signals, divided into specific signal types, and then sent to the
band-specific HRDU. Here the signals are amplified and radiated to a combiner or directly to an antenna
port. For uplink signals, the HRDU filters RF signals received from the combiner in a cavity duplexer,
amplifies them and sends them to the R-Optic module. The R-Optic converts the RF signals back to optical
signals and sends them to the ODU.
When receiving RX signals through the antenna port, the HRDU filters out-of-band signals. After converted,
the signals are sent to the BIU through the ODU. HMRU can be equipped with up to four HRDUs (High
power Remote Drive Unit) and each HRDU supports single band only. HARU receives TX RF signals from
HMRU and then the signals will be amplified by the high power amplifier in the HRDU, that is consisted
with UDCU, PAU and Cavity duplexer, and then send them to the CU (Combiner Unit).
When the HARU receives RX signals through the antenna port, HRDU filters out-of-band signals and sends
theem to HMRU through RF cables.
Figure 4.1 – High power Remote Optic Unit (HROU)