FlexWave
®
Prism Remote Unit and RF Module Installation Guide
FWPP-504-02
Page 20
© May 2017 CommScope, Inc.
Overview of RF Modules for Prism Remote Units
Duplexer and Low Noise Amplifier
The RF Module provides the Remote Unit with an internal Duplexer that is optimized to provide the desired RF
band-pass filtering and in-band equipment isolation between FWD and REV paths. The Duplexer provides the
filtering necessary to the transmit and receive paths to and from the connected antenna.
The Duplexer for the Single- and Dual-Bay RF Modules and the Legacy Dual-Bay 40W RF Modules contains up to
two REV path Low Noise Amplifiers (LNA for PRI and/or SEC reverse paths).
The Duplexer for an HDM RF Module does not have a Low Noise Amplifier.
Duplexers are not field serviceable.
Digital Processing Module
The Digital Processing Module (DPM) is found only in the HDM RF Modules. The DPM provides the primary
processing and logic functions for the HDM RF Module. It also provides the primary power interface for the HDM
RF Module, and conversion of the native 28 Vdc voltage to lower voltages as necessary for functionality.
The DPM has a Transmit (Tx) Board and a Receive (Rx) Board:
•
Tx Board—provides band specific filtering for the intended Transmit path.
•
Rx Board—provides band specific filtering for the intended Receive path.
Cables
Always provided at each RF Module shelf are five cables:
•
two High-Speed Data Cables, which in this document are referred to as LVDS (Low-Voltage Differential
Signaling) cables
•
two RF Cables (TX0/RX0) and (TX1/RX1)
•
one Power (PWR) Cable.
The RF Module cables that are pre-installed in the PRU connect to the corresponding connectors on the RF
Module. The RF Module cables correlate to the antenna connectors on the bottom of the Remote Unit chassis.
