User's Manual

DELTANODE USER MANUAL

©DeltaNode Solutions 2015

Revision 15-01

 Single mode fiber

 Angled connectors

 Optical loss < 15 dB

1 Introduction

This document contains quick guidelines on how to operate the DeltaNode Fiber-DAS concept and

how to install a Remote Unit on site, commission and maintain such a system for the life span of the

entire installation.

When other manufacturers have converted off-air repeaters into fiber-fed repeaters, DeltaNode has

developed the concept from scratch with fiber distribution in mind from the start. This allows for

extremely good radio performance and we are proud of having the best in class noise figure of less

than 3 dB for the whole system, antenna > remote unit > base station interface port.

1.1 RF on fiber

A fiber distributed antenna system (Fiber-DAS) is a very efficient way of transmitting radio signals

over large distances. Up to about 25 km of fiber between the head-end and the remote unit is

allowed, providing that the radio access technology (RAN) do not suffer timing issues and that the

fiber loss is within the specification.

The main principle is to use an infra-red light source which is modulated with the combined radio

signals that needs to be propagated. The fiber channel system is ultra wide-band, ranging from 88

MHz up to 2600 MHz and thus covering most types of radio communication systems such as FM

broadcast, VHF communication radios (so called PMR systems), TETRA, GSM, CDMA, WCDMA and

other radio access technologies that are available.

The dynamic of the fiber is good enough to tolerate multi-carrier, multi-band and multi-operator

solutions this way, but of course they all share the available dynamics and if there are a very large

number of carriers the fiber attenuation needs to be looked at of course.

Because most land mobile radio systems and cellular systems are using Frequency Division Duplex

(FDD) this means that there needs to be either two separate fibers, one for the uplink (signals from

the terminal towards the base station) and for the downlink (signals from the radio base station

towards the terminal) or they may be multiplexed on the same fiber using different wavelengths.

The most popular way is to use wave-length division multiplexing

(WDM) which is the normal configuration of the DeltaNode Fiber-DAS

concept. However, separate UL/DL fibers can be used if it is necessary

or desired.

Because the modulation is analogue the system requires the fibers to be of single mode type. All

connectors used in DeltaNode equipment for Fiber-DAS are of SC-APC type with a 7° angle. It is very

important that all connectors in patches et cetera between the Master Unit (MU) and the Remote

Unit (RU) are angled; otherwise reflections are caused which will cause problems with the quality of

the signals throughout the entire DAS system.