EXPRESS DAS
Installation and Operations Manual
EXPRESS DAS Installation and Operations Manual – Version 2.2 November 2013
5
The figure shows a typical system topology with the primary components: BIU-ODU-MRU-DMS.
Figure 2.1 – EXPRESS Distributed Antenna System (DAS) Topology
The SOLiD EXPRESS Base Station Interface Unit (BIU), commonly referred to as the headend, receives
signals from the carrier’s base station and sends these to the system’s Optical Distribution Unit (ODU).
The ODU converts the RF signals into optical signals and distributes them over fiber cabling to the
EXPRESS Main Remote Units, or MRUs, in that sector. MRUs can be accompanied by Add-on Remote
Units (ARUs), depending on the frequency bands required for each installation.
The MRU converts the optical signals back to RF signals and transports them across coaxial cable to the
DAS antennae which radiate the wireless signals within the corresponding sector to the recipient's cell
phone, public safety radio, smart phone, tablet or aircard.
Sending a signal back to the carrier follows the reverse path using the same equipment.
The BIU has two layers to support both SISO and MIMO configurations using separate optical fiber cable.
One strand of fiber is needed for a SISO configuration, while two strands are needed for MIMO.
Содержание EXPRESS Single-Carrier DAS
Страница 10: ......