ACR Series Overview
In contrast to the RAR, the ACR may have multiple SUs that are interconnected to the DU via a hub, e.g., Optical Master Unit (OMU), which provides IF signal splitting, DC power, and a frequency reference to each of the connected SUs. The DU and hub may be spaced out by a maximum of 100 feet. Similarly, the spacing between the hub and each SU can be up to 100 feet. These distances are currently set by the intrinsic loss of the LMR-300 cable. If a greater distance is required, a lower loss cable can be utilized. The RF frontend for DU and SUs is similar to those used in the RAR, except that the SU antenna system for ACR has a wider beam to service several spaced out UEs at close range.