User's Manual

WFDS User Manual

2 WFDS Remote Units

2.1 About This Chapter

This chapter consists of the following sections:

z The compendium of function

z Principle of Work and Specifications

z Application of RU

z RU Installation and Power Supply

2.2 The compendium of function

The remote unit is an active transceiver which connects the expansion unit or the main

unit. RU is the last step in the entire system, and it takes a very important part in the

whole system, that is amplifying.

RU receives UL fiber optical signal, then it transmitted into the optical module and

transform the optical signal into electric signal, after enlargement, it send by the external

connection antenna; in a similar way, equipment receives uplink RF signal by the

external connection antenna, and amplified in uplink then input to the optical module.

Then output the fiber optical signal to the EU (or MU) after the optical module transform

the electrical signal to the optical signal.

2.3 Principle of Work and Specifications

2.3.1 Principle of Work

The equipment includes the optical module, UL amplifier, DL amplifier, duplexer,

monitoring unit and power supplier.

DL: RU receives the DL fiber optical signal from the expansion unit or the main unit,

then the optical module transmits the optical signal into RF signal. After amplifying, the

signal is sent through coaxial cable by the RF antenna.

Meanwhile, RU can receive setting and inquiring information from Expansion and Main

Unit