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The STM-4/OC-12

wireless system

for mobile and access

networks

SRA 4

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Capacities

622 Mbps

311 Mbps155 Mbps

21 E1

42 E1

6 - 13 GHz

15 - 38 GHz

2

Applications

System Configuration

Features

System Management

Interfaces

Technical Data

Contents especially in areas where the choiceof implementing optical fibres couldbe too expensive and time consuming

and infrastructure space is at a

premium.Integrated in a wide range of

Siemens Mobile products, SRA 4

is designed to provide capacities

from single to multiple 155Mb/s

data channels, up to a total transport

capability of 622 Mb/s interfacing

SONET (OC-3/ OC-12), SDH (STM-1 /

2xSTM-1/STM-4) and add/drop up to

42xE1 tributary interfaces performing

multiplexing, line protection and

cross connection.

The continued growth of cellular

subscribers worldwide is driving

the cellular backhaul market for

microwave radios and is pushing

SDH further out towards the regional

transport layer of large networks,

down to the access layer.

Furthermore the increase in voice

traffic, combined with the newly

emerging cellular data market,

increases customer requirements

for spectrum efficiency and

equipment flexibility as well SRA 4,

the new Siemens SDH split radio

system meets these needs,

addressing new capacity demands

of telecommunication network overshort to medium distances,

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3

Mobile networks

The UMTS transport network requires

the use of packet-based data transport

technologies such as IP and ATM as

well as the traditional SONET/SDH for

connecting the RNC core and UTRAN

network.

SRA 4, having full compatibility with all

these technologies and high system

scalability, represents the ideal choice,

ensuring cost-effective ultrahigh

capacity applications for all typical

mobile networks such as rings, mesh

or star topologies.

The full RF frequency coverage (6-38

GHz) and the multiple modulation typeover the same hardware platform make

SRA 4 a single solution for each mobile

operator who needs high performances

and high spectrum efficiency, with at

the same time just one platform for

deploying the entire IP/ATM/SDH

wireless network.

Unlike the fibre alternative, SRA 4

point-to-point solution is cost effective,

flexible and quick to deploy up to STM-

4 capacity, minimising the risk of

interoperability issues because it fits

with all worldwide microwave

standards.

Fixed / Access networks

SRA 4 is otherwise the ideal choice for

building fixed or access networks with

a total wireless approach or also,

thanks to its different baseband

interfaces, with an easy combination

with any existing cable systems.

With its simple split-mount solutionbringing up to STM-4 capacity, it

represents a cheap, easy-to-deploy

and highly reliable point to point

transmission system.

The particular system concept

privileges two fundamental issues for

any operator: flexibility and scalability.

SRA 4 can be set up for a gradual

deployment since, as the penetration

rate raises up, the transported capacity

can be increased remotely and

completely via software.

SRA 4 provides dedicated high capacity

wireless connections for every access

operator type: from large enterprises

and multi-dwelling businesses to

residential property, supporting also

high-speed Internet access and

integrated data, as well as video and

voice services.

Wired and wireless networks.

Due to the hastening demand for more

flexible and more advanced services

from business and residential customer

groups alike and to the growing

volume in data traffic packets in

Applications

addition to traditional ones, PDH and

ATM signals have to be transported

over the SDH network.Plesiochronous

and lower bit rate syncronous signal

can be extracted from or inserted into

high speed SDH bit streams by means

of ADM embedded into the SRA4 radio.

By deploying SRA4 ADM Built in and

moving intelligence to the edge of the

backhaul network,service providers can

reduce or eliminate costly leased T1/E1

lines, consolidate traffic onto a fewer

number of mobile switch interfaces.

and free up stranded bandwidth.

The SRA 4 design allows an easy and

accurate change of capacity. Based onplug and play concept, SRA4

equipment can be used either as a SDH

(from STM1/STM2 up to STM4) radio in

access network or into wired and

wireless networks, aggregating lower

rate traffic for a more efficient

provisioning.

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SRA 4 is a product combining high

capacity and high bandwidth efficiency

into a single radio platform. Capacity

can be doubled as well as bandwidth

can be optimised with simple SW

operations and above all without any

HW change.

The Indoor Unit system, 88 mm high, is

composed of a few slide-units:

Controller Unit, Alarm Unit, Fan Unit andtwo BB-Modems. This modularity

ensures customers a basic characteristic

wireless systems: a high level of

scalability. The other fundamental

operator requirement, flexibility, is

ensured by the possibility to double the

capacity from STM-1 to 2xSTM-1 (single-

carrier) without any HW intervention,

neither indoor nor, especially, outdoor.

The equipment supports rapid network

capacity growth and new revenuesproducing services by simply adding

additional interface modules.

Frequency efficiency

With the benefit of a modulation format

completely software selectable from 32

TCM to 128 TCM, in fact, the equipment

can offer a high spectrum efficiency by

optaining the same capacity within half

band (STM-1 in 27.5/28 MHz/2x STM-1

in 55/56 MHz) with a considerable

saving of spectrum in a given

geographical area as well as cost saving

in licence fees. Moreover the frequency

efficiency allocation can be doubled

using dual polarization co-channel

transmission achieved with a fully digital

cross polarization interference canceller

(XPIC).

Capacity upgrading

Increasing capacity of the existing links

requires additional transmission

bandwidth available and adequate

system gain to maintain the overall

network quality. SRA4 is able to

guarantee all these features.

Its capacity is easily software upgradeable.

Using a single hardware, in fact,

SRA 4 can immediately ensure up to

4xSTM-1 active bearers giving the samespectral efficiency of a single STM-1/OC-3.

The right system for any ring network

The same HW can be configured in a

ring as 2x(1+0) giving the possibility to

make the Est-West direction in a ring,

using a single IDU and two ODU (one

per each side).

With no additional hardware

components, capacity can successively

System Configuration

4

2xSTM-1 Ring

SNCP Path ProtectionHub

21 E1, 42 E1

be doubled (from 1 to 2xSTM-1 (single-

carrier) as shown in the figure below)

through the variation of the modulation

level (from 32 to 128 TCM) completely

selectable 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

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5

The outdoor unit, besides RF

reception and transmission, carries

out signal conversion for sending it

to the indoor unit through a coaxial

cable. The outdoor unit houses one

RF transceiver per case. The outdoor

unit case, once in field, does not need

to be open requiring only very simple

and easy operations either during

installation or maintenance and test

phases.

Broadest frequency

coverage

The wide RF frequency coverage

(from 6 up to 38 GHz) gives theoperator the possibility to find the

right solution for every local

application inside the network.

High order modulation

and advanced error

correction

128 TCM modulation scheme with

Reed Solomon error correction,

supporting STM-1/ 2xSTM-1 payload

transmission in 28/56 MHz, optimizesbandwidth occupancy. The major

benefit of this modulation format is

a strongly enhanced error correction

capability and bit error rate

performance, if compared with

conventional QAM systems.

Automatic Transmitter Power

Control (ATPC) and Remote

Transmit Power Control (RTPC)

Continuous ATPC or RTPC (SW

selectable) up to 15 dB range (1 dB

stepped).

Frequency Agility

Frequency channel can be adjusted

completely via SW (LinkViewer LCT/

NetViewer NMS) as a wide tuning

range gives the radio maximum

flexibility.

Cross Polar Operation

(Option)

Dual polarization co-channel

transmission can be achieved with

a fully digital cross polarization

interference canceller (XPIC).

The Cross-Polarization Interference

Canceller (XPIC) guarantees proper

reduction of cross-polarization

interferences also during non-nominal

propagation conditions and allows

frequency use on both polarizations,

doubling transmission capacity.

SNCP traffic protection

Moreover the SRA4 ADM can offer

to the service provider a versatile

protection scheme including SNCPfor both ring and linear Network

topology.

Features

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LAN

LAN

DCN LAN DCN LAN DCN LAN

WAN

INTERNET

Siemens and ThirdParty OSS

RemoteNetViewer

Client

Browser linkedto web interface

via notebook

Browserlinkedto web

interfacevia palmtop

NetViewerClient

NetViewerClient

NetViewerClient NetViewer

Server MAIN

RemoteNetViewer

Server

NetViewerServer

Router

Router

WAN

Router

Router

6

System Management

SRA4 management systems carry

out all the functions required for

minimising operational costs.

LCT LinkViewer, the system dedicated

to the local link management,

connects the SRA4 local and far-and

terminals through the F interface.

In addition NetViewer, combining

Element with Network Management

functions, is the Radio Network

Manager for all the Siemens Radio

Systems.

Security Management, Fault

management, Configuration Set-up,

Performance Management, Metering

are performed by both, LCT

LinkViewer and NetViewer,

by the former on a link base, by the

latter pointing to each of the Radio

Systems connected to the network.

Siemens microwave product lines,

can be managed not only by a wide

range Siemens Management Systems

but also by third party Management

Systems.

Even when the NetViewer is connected

to the network, LinkViewer can make

the link reconfiguration

at any based network point.

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Interface

Description

Coaxial 1-0/2.3SRA 4 ADM

High density I/O 100 Pin

Description

Interface

The auxiliary data channelare two independent64 kbit/s synchronous

channel

The External Clockcan be extractedfrom Sync signal

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

The Ethernet ports areaccessed through RJ45

connector located on theIDU front panel

One channel 64 kbit/scomplies with ITU-T Rec.

G703 for each BB modem.One channel 64 kbit/s

V.11 for each BB modem.

ExternalSynchronization

SRA 4 ADM

One flow 2.048 kbit/scomplies with

ITU-T Rec. G703

E link interface:10 Base T

Q link interface:10-100 Base T with

TCP-IP protocol

SRA4 system supports additional

applications through overhead

channels; connections are performed

by industry standard connectors on

the Access Panel.

Interfaces

7

STM1/2xSTM-1input/output

electrical/opticalinterface for eachBaseband Modem

STM4 input/outputoptical interface

available on the IDUfront panel

The GigabitEthernet/1000 Base

T/SX ports areaccessed throughoptical connector

located onthe IDU front panel

The 21 channels 2Mbit/s I/O interface isconnected to the BB/ADM unit through these

connectors by a ADM-link cable.

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Technical Data

INDOOR UNIT SRA4/SRA4 ADM

Payload 155.52 Mb/s, 311 Mb/s, 622 Mb/s, 21E1, 42E1

Traffic per transceiver STM-1

2X STM-1, 4X STM-1, STM4

Modulation 32 TCM + reed solomon

64 TCM + reed solomon

128 TCM + reed solomon

Physical interfaces electrical, G.703

optical G.957 S-11

Auxilary interface 2.048 Mb/S wayside traffic (2X2 Mb/S per each indoor unit)

Dimensions HXWXD 88 X 442 X 240 mm

Weight 5 kg

Idu-odu cable length up to 200 m - braided cable

INDOOR UNIT SRA 4 COMPACT

Payload 155.52 Mb/s

Traffic per transceiver STM-1

Modulation 32 TCM + reed solomon

64 TCM + reed solomon

128 TCM + reed solomon

Physical interfaces electrical, G.703

optical G.957 S-11

Auxilary interface G.703

Dimensions HXWXD 44 X 442 X 240 mm

Weight 4 kg

Idu-odu cable length up to 200 m - braided cable

8

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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 37.0-40.0

Modulation 128 TCM 128 TCM 128 TCM 128 TCM 128 TCM 128 TCM

32 TCM 32 TCM 32 TCM 32 TCM 32 TCM 32 TCM

Channel spacing 28/56 27.5/55 28/56 28/56 28/56 28/50/56

Tx output power (dBm)

STM-1 18 18 18 14 14 14

Receiver threshold(dBm) at 10-6 BER

STM-1 ( HD) -78(-71) -77.5(-70.5) -76.5(-69.5) -75(-68) -74(-67) -73.5(-66.5)

2X STM-1 -68 -67.5 -66,5 -65 -64 -63.5

System gain (dB) at 10-6 BER

STM-1 (HD) 96(89) 95.5(88.5) 94.5(87.5) 88(81) 88(81) 87.5(80.5)

2X STM-1 86 85.5 84.5 78 78 77.5

Dimension (WxDxH) 232 x 138 x 232 mm

Weight 7 Kg

OUTDOOR UNIT 6 7/8 10/11 13

Frequency band 5.670/ 7.110 7.1-7.7/ 7.7-8.5 10-11.7 12.7-13.3

Modulation 64/128 TCM 128 TCM 64/128 TCM 128 TCM

Channel spacing 28/29.65/40 28/29,6 40 28

Tx output power (dBm)

23 23 21 20

Receiver threshold(dBm) at 10-6 BER

STM-1 -71.5 -71 -71.5 -70.5

System gain (dB) at 10-6 BER

STM-1 94.5 94 92.5 90.5

Dimension (WXDXH) 283 X 182 X 385 mm

Weight 11 kg

9

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Siemens Mobile Communications S.p.A.Sales OfficeViale P. e A. Pirelli, 1020126 Milano - ItalyPhone + 39 02 243 1

E5.6 1760/1000 Siemens Mobile Communications SpaPrinted in Italy

This publication is issued to provide information only and is not to form

part of any order or contract. The products and services described herein

are subject to availability and to change without notice.

All brand names and trademarks mentioned in this document are

the property of their respective owners.

www.siemens.com/mn

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 DemodulatorDSC 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 ChannelSC 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 Users service Channel

USW Unipolar Switch

VF Voice Frequency

WS Wayside Signal

XPIC Cross Polarization Interference

Canceller

Acronyms and Abbreviations