Remote Radio Unit (RRU)
The Remote Radio Unit (RRU) transmits RF signals and is connected to the Baseband Unit (BBU) through optical fibers. With advanced RF and antenna technologies, RRU enables high-rate and low-latency data processing and significantly enhances the eNodeB capacity.
Highlights
Supports multiple modes and multiple standards, SDR architecture, LTE, PMR etc
Supports 1.4M/3M/5M/10M/15M/20M networking wideband
Supports enhanced DPD technology with high power amplification efficiency and high adjacent channel index
Supports wall-mount, pole-mount, and tower-mount installation, saving site resources
Adopts aviation connectors adaptive to harsh environments

Hytera LTE-PMR Convergence Solution Introduction
It is good that data services from commercial LTE carriers can support the data requirements for daily routine scenarios. But it's a totally different picture if you want to swap your private PMR network with LTE service. So why not unify the narrowband PMR and broadband LTE networks?