s

SRA 4

The STM-1/4/OC-3/12wireless system

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SRA 4

Applications

System Configuration

Features

System Management

Interfaces

Technical Data

Contents

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network over short to medium distances,especially in areas where the choice of implementing optical fibres could betoo expensive and time consuming andinfrastructure space is at a premium.Integrated in a wide range of SiemensMobile products, SRA 4 is designed toprovide capacities from single to multiple155Mb/s data channels, up to a totaltransport capability of 622 Mb/sinterfacing both SONET (OC-3/ OC-12)and SDH ( STM-1 / 2x STM-1/ STM-4)worlds and complying with FCC and ETSIradio channel arrangements.

SRA 4

Capacities622 Mbps

311 Mbps

155 Mbps

The continued growth of cellularsubscribers worldwide is driving thecellular backhaul market for microwaveradios and is pushing SDH further outtowards the regional transport layer oflarge networks, down to the access layer.Furthermore the increase in voice traffic,combined with the newly emergingcellular data market, increases customerrequirements for spectrum efficiency and equipment flexibility as well SRA 4,the new Siemens SDH split radio systemmeets these needs, addressing newcapacity demands of telecommunication

6 - 13 GHz

15 - 38 GHz

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Mobile networks

Today UMTS networks require wirelesssystems able to transport traffic datadifferent for rate and technology. In the UTRAN, in fact, ATM is used forconnecting NodeB-RNC or for intra-RNClinks; in the core network, moreover, bothpacket and circuit data transmission isusually performed not only with opticalfibre networks but also with high capacitymicrowave systems. SRA 4 with full compatibility with all thesetechnologies and high system scalability,represents the ideal choice, ensuring cost-effective ultrahigh capacity applications toall typical mobile networks such as rings,mesh or star topologies.The full RF frequency coverage (6-38 GHz)and the multiple modulation type over thesame hardware platform makes SRA 4 asingle solution for each mobile operatorwho needs high performances and highspectrum efficiency, but with at the sametime just one platform for deploying theentire IP/ATM/SDH wireless network.Unlike the fibre alternative, SRA 4 point-to-point solution is cost effective, flexible andquick to deploy up to STM-4 capacity,minimising the risk of interoperability issuesbecause it fits with all worldwidemicrowave standards.

Fixed / Access networks

SRA 4 is otherwise the ideal choice forbuilding fixed or access networks with atotal wireless approach or also, thanks to itsdifferent baseband interfaces, with an easycombination with any existing cablesystems. With its simple split-mountsolution bringing up to STM-4 capacity, itrepresents a cheap, easy-to-deploy andhighly reliable point to point transmissionsystem.The particular system concept privilegestwo fundamental issues for any operator:flexibility and scalability. SRA 4 can be setup for a gradual deployment since, as thepenetration rate raises, the transportedcapacity can be increased remotely andcompletely via software. SRA 4 provides dedicated high capacitywireless connections for every accessoperator type: from large enterprises tomulti-dwelling businesses.

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Applications

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SRA 4 is a product combining highcapacity and high bandwidth efficiencyinto a single radio platform. Capacity canbe doubled as well as bandwidth can beoptimised with simple SW operations andabove all without any HW change. TheIndoor Unit system, 88 mm high, iscomposed of a few slide-units: ControllerUnit, Alarm Unit, Fan Unit and two BB-Modems. This modularity ensurescustomers a basic characteristic wirelesssystems: a high level of scalability. Theother fundamental operator requirement,flexibility, is ensured by the possibility todouble the capacity from STM-1 to2xSTM-1 (single-carrier) without any HWintervention, neither indoor nor,especially, outdoor.

Frequency efficiencyWith the benefit of a modulation formatcompletely software selectable from 32TCM to 128 TCM, in fact, the equipmentcan offer a high spectrum efficiency byoptaining the same capacity within halfband (STM-1 in 27.5/28 MHz/2x STM-1 in55/56 MHz) with a considerable saving ofspectrum in a given geographical area aswell as cost saving in licence fees.Moreover the frequency efficiencyallocation can be doubled using dualpolarization co-channel transmissionachieved with a fully digital crosspolarization interference canceller (XPIC).

Capacity upgradingIncreasing capacity of the existing linksrequires additional transmissionbandwidth available and adequate systemgain to maintain the overall networkquality. SRA4 is able to guarantee allthese features. Its capacity is easilysoftware upgradeable. Using a singlehardware, in fact, SRA 4 can immediatelyensure up to 4xSTM-1 active bearersgiving the same spectral efficiency of asingle STM-1/OC-3.

System ConfigurationThe right system forany ring networkThe same HW can be configured in a ringas 2x(1+0) giving the possibility to makethe Est-West direction in a ring, using asingle IDU and two ODU (one per eachside). With no additional hardwarecomponents, capacity can successively bedoubled (from 1 to 2xSTM-1 (single-carrier) as shown in the figure below)through the variation of the modulationlevel (from 32 to 128 TCM) completelyselectable via software.

N+1 configuration Equipment configuration is designed to be scalable from to1+1 up to N+1.The system can be expanded to a multi-channel N+1 (N<3) configuration withoutany external additional switching system.The implication of N+ 1 system was therequirement for large amounts ofbandwidth to accommodate the numeroustraffic-bearing channels.

5

ADM

ADM

ADM

ADM2x STM-1155 Mbps Ring

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The outdoor unit, besides RF receptionand transmission, carries out signalconversion for sending it to the indoorunit through a coaxial cable. The outdoorunit houses one RF transceiver per case.The outdoor unit case, once in field, doesnot need to be open requiring only verysimple and easy operations either duringinstallation or maintenance and test phases.

Broadest frequency coverage The wide RF frequency coverage (from 6up to 38 GHz) gives the operator thepossibility to find the right solution forevery local application inside the network.

High order modulation and advanced error correction128 TCM modulation scheme with Reed Solomon error correction, supportingSTM-1/ 2xSTM-1 payload transmission in 28/56 MHz, optimizes bandwidthoccupancy. The major benefit of thismodulation format is a strongly enhancederror correction capability and bit errorrate performance, if compared withconventional QAM systems.

Automatic TransmitterPower Control (ATPC)and Remote TransmitPower Control (RTPC)Continuous ATPC or RTPC (SW selectable)in 15 dB range (1 dB stepped).

Frequency AgilityFrequency channel can be adjusted completely via SW (LinkViewer LCT/NetViewer NMS) as a wide tuning rangegives the radio maximum flexibility.

Cross Polar Operation (Option)Dual polarization co-channel transmissioncan be achieved with a fully digital crosspolarization interference canceller(XPIC).The Cross-Polarization InterferenceCanceller (XPIC) guarantees properreduction of cross-polarizationinterferences also during non-nominalpropagation conditions and allowsfrequency use on both polarizations,doubling transmission capacity.

Features

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LAN

LAN

DCN LAN DCN LAN DCN LAN

WAN

INTERNETSNMP

HTTP

UpperTMN System

Remote NetViewer

Client

Browser +NetViewer

Client

NetViewer Client

NetViewer Client

NetViewer Client

NetViewer Server MAIN

RemoteNetViewer

Server

NetViewer Server

Router

Router

WAN

Router

Router

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System Management

both, LCT LinkViewer and NetViewer, by the former on a link base, by the latterpointing to each of the Radio Systemsconnected to the network. Siemensmicrowave product lines, can be managednot only by a wide range SiemensManagement Systems but also by thirdparty Management Systems. Even when the NetViewer is connected to the network, LinkViewer can make the link reconfiguration at any basednetwork point.

SRA4 management systems carry out allthe functions required for minimisingoperational costs. LCT LinkViewer, the system dedicated to the local linkmanagement, connects the SRA4 local andfar-and terminals through the F interface.In addition NetViewer, combining Elementwith Network Management functions, is the Radio Network Manager for all theSiemens Radio Systems. Security Management, Fault management,Configuration Set-up, PerformanceManagement, Metering are performed by

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Interface

Description STM1/2xSTM-1 STM1/2xSTM-1 STM4 input/output The Gigabit input/output electrical input/output optical optical interface Ethernet/1000 Base SX

interface for each interface for each available on the IDU ports are accessedBaseband Modem Baseband Modem front panel through optical

connector located onthe IDU front panel

Coaxial 1-0/2.3

Description

Interface

The auxiliary data channel are two independent 64 kbit/s

synchronous channel

2 Mb/s stream as WS (Way Side) traffic

The Ethernet ports are accessedthrough RJ45 connector located

on the IDU front panel

One channel 64 kbit/s complieswith ITU-T Rec. G703 for each

BB modem.

One channel 64 kbit/s V.11 for each BB modem.

One flow 2.048 kbit/s complieswith ITU-T Rec. G703

E link interface: 10 Base T

Q link interface: 10-100 Base Twith TCP-IP protocol

SRA4 system supports additionalapplications through overhead channels;connections are performed by industrystandard connectors on the Access Panel.

Interfaces

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Technical Data

INDOOR UNIT

Payload 155.52 Mbit/s, 311 Mbit/s, 622 Mbit/sTraffic per transceiver STM-1

2x STM-1, 4x STM-1, STM4Modulation 32 TCM + Reed Solomon

128 TCM + Reed SolomonPhysical Interfaces Electrical, G.703

Optical G.957 S-11Auxilary Interface 2.048 Mbit/s Wayside Traffic (2x2 Mbit/s per each Indoor Unit)Dimensions HxWxD 88 x 442 x 240 mmWeight 5 KgIDU-ODU Cable Length Up to 150 m - Braided Cable

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OUTDOOR UNIT 6 7/8 11 13

Frequency Band 5.670/ 7.110 7.1-7.7/ 7.7-8.5 10.7-11.7 12.7-13.3Modulation 128 TCM 128 TCM 128 TCM 128 TCMChannel Spacing 28/29.65/40 28/29.6 40 28Tx output power (dBm)STM-1 23 23 21 20Receiver threshold(dBm) at 10-6 BERSTM-1 -70.5 -70.5 -70 -69.5System gain (dB) at 10-6 BERSTM-1 93.5 93.5 91 89.5Dimensions (WxDxH) 283 x 182 x 385 mm Weight 11 Kg

OUTDOOR UNIT 15 18 23 26 28 32 38

Frequency Band 14.4-15.35 17.7-19.7 21.2-23.6 24.5-26.5 27.5-29.5 31.8-33.4 37.0-40.0Modulation 128 TCm 128 TCM 128 TCM 128 TCM 128 TCM 128 TCM 128 TCM

32 TCM 32 TCM 32 TCM 32 TCM 32 TCM 32 TCM 32 TCMChannel Spacing 28/56 27.5/55 28/56 28/56 28/56 28/56 28/50/56Tx output power (dBm)STM-1 18 18 16.5 15 15 14 14Receiver threshold(dBm) at 10-6 BERSTM-1 (HD) -76 (-69.5) -76 (-69.5) -76 (-69.5) -73 (-66.5) -73 (-66.5) -72 (-65.5) -72 (-65.5)2x STM-1 -66.5 -66.5 -66.5 -63.5 -63.5 -62.5 -62.5System gain (dB) at 10-6 BERSTM-1 (HD) 94 (87.5) 94 (87.5) 92.5 (86) 88 (81.5) 88 (81.5) 86 (79.5) 86 (79.5)2x STM-1 84.5 84.5 83 78.5 78.5 76.5 76.5Dimensions (WxDxH) 232 x 138 x 232 mmWeight 7 Kg

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Contact us:Siemens Mobile Communications SpASales OfficesViale P. e A. Pirelli, 10 - 20126 Milano - Italyhttp://www.siemens-mobile.it

visit our international website at www.siemens.com/mobileor send an e-mail to microwave.networks@icn.siemens.it

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ine This publication is for information only and does not form part of any agreement or contract. We reserve the right to make changes to the products or services offered or their

availability.G3.1.1760/1000 • Siemens Mobile Communications SpA

AGC Automatic Gain Control

AMP Amplifier

ATPC Automatic Transmitter Power Control

BB Base Band

BBC Base Band Control

BER Bit Error Ratio

BSW Bipolar Switch

DADE Differential Absolute Delay

Equalizer

DCC Digital Communication Channel

DEF Decision Feedback

DEM Demodulator

DSC Digital Service Channel

ECU Embedded Channel Unit/

Embedded Communication Unit

EM Element Manager

EOW Engineering Order Wire

EQL Equalizer

ETSI European Telecommunication

Standard Institute

FEC Forward Error Correction

HK Housekeeping

IF Intermediate Frequency

INTF Interface

ITU International Telecommunication

Union

LCT Local Craft Terminal

MCF Message Communication Function

MLCM Multi Level Code Modulation

MOD Modulator

MSP Multiplex Section Protection

NE Network Element

OCC Occasional

OPT Optical

PDH Plesiochronous Digital Hierarchy

PM Performance Monitor

PPM Percent Per Million

QAM Quadrature Amplitude Modulation

RDP Receiver Digital Processing

RF Radio Frequency

RFCOH Radio Frame Complementary Over

head byte

RPS Radio Protection Switching

RSL Receive Signal Level

RSC Radio Service Channel

SC Service Channel

SCS Supervision, Control and Switching

unit

SD Space Diversity

SDH Synchronous Digital Hierarchy

SEMF Synchronous Equipment

Management Function

SLP EQL Slope Equalizer

SSU Synchronous Source Unit

STM-1 Synchronous Transfer Module level 1

TDP Transmission Digital Processing

TMN Telecommunication Management

Network

TSU Timing Source Unit

TVE Transversal Equalizer

UC User’s service Channel

USW Unipolar Switch

VF Voice Frequency

WS Wayside Signal

XPIC Cross Polarization Interference

Canceller

Acronyms and Abbreviations

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