User's Manual

CrossFire iDAS – All-Digital Transport System

User Guide

2. System Overview

2.1. Overview

The CrossFire NP system is a distributed antenna system (DAS). It consists of Access Unit (AU), Expansion

Unit-Ethernet (EU-E) and Nano Power Remote Unit (NPRU). It splits the transmitted power among several

antenna elements installed in the distributed environment, separated in space so as to provide coverage

over the ideal area with reduced total power and improved reliability.

Combining digital processing and digital optical transmission technology, the AU is able to process

radio-frequency signals of different operators with different standards and frequency bands from base

station, and transmits composite signal to EU-E in optical port. EU-E reframes signal and transmits it to

NPRU via 10 Gigabit Ethernet port. After digital-analog conversion and power amplification in NPRU, radio

signal covers required area through the antenna-feeder system.

2.2. System Framework

Figure 2-1 shows the typical CrossFire system framework.

BTS

RRU

RRULTE

EU-E1 EU-E7

EU-E2

EU-E3

EU-E4

NPRU1

EU-E5

EU-E6

NPRU2

NPRU3

NPRU4

NPRU12

Fiber

CAT6A

Fiber

Figure 2-1 Typical System Framework for CrossFire

AU supports star network (AU to EU-E). A Master-AU can connect to up to two Slave-AUs and six EU-Es

simultaneously.

EU-E supports a daisy-chained network (EU-E to EU-E) and a star type network (EU-E to NPRU). An EU-E

can connect to up to twelve NPRUs.