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17,7 19,7 22 23,6 24,5 26,5 f/GHz

CEPT T/R 12-03 E

CEPT T/R 13-02 EAnnex A

CEPT T/R 13-02 E

Annex B

Frequency Range

55 MHz / 17 ch. / 16 QAM27,5 MHz / 35 ch. / 128 QAM

56 MHz / 9 ch. / 16 QAM28 MHz / 20 ch. / 128 QAM

56 MHz / 16 ch. / 16 QAM

28 MHz / 32 ch. / 128 QAMCEPT T/R 12-01 E

Annex A56 MHz / 20 ch. / 16 QAM

37,0 39,5

Supported short-haul SDH microwave system frequency ranges

MDRS 155/622 S

MDRS 155/622 CMDRS 155/622 N

Short-Haul SDH Microwave Radio Systems

The MDRS 155 S, MDRS 155 C and

MDRS 155 N digital microwave radiosystems from Marconi are designed for short and medium range transmission

optimised for use in SDH networks. Theyfulfil all the relevant ITU and ETSI stan-dards for SDH systems. Thanks to their

full SDH compatibility and their integra-

tion into network management systemsvia a Q interface these microwave radio

systems represent real and easy tomanage network elements. They are low-cost and reliable alternatives to cable-

bound transmission systems, and aresimple and quick to implement.

The transmission rate of the microwaveradio systems is STM-1 or, optionally

protected STM-4. The signal is transmit-ted by using a robust, high system gainmodulation or even better by using ahigh spectrum efficient modulation. The

baseband interface for STM-1 can bedesigned as an electrical or optical inter-face.

Freely available bytes in the SOH of theSTM-1 signal can be used to transmit an

additional 2 Mbit/s ‘wayside’ channel

and several 64 kbit/s service channels.

Frequency band utilisation

Up to 35 RF channels can be used, de-pending onthe fre-quencypattern.Each RFchannel

can beused ontwo crossed

Features:

• Transmission of STM-1 signals

• Expandable to protected STM-4transmission over one antenna

• Frequencies from 18 to 38 GHz

• High system gain through 16MLQAM or high spectrum effi-

ciency through 128 MQLAM• Direct adjacent (ACDP) and co-

polar channel operation (CCDP)possible

• ETSI, 19’’ or wall mounting de-sign

• 1+0 and 1+1 line protection or hot standby with integrated pro-tection switch for improvedtransmission quality

• Optional electrical or optical

STM-1 baseband interface• System configuration adjustable

via F interface

• High MTBF through very-large-scale integration

• Flexible system-cable enablessimple and easy installation

• Automatic Transmission Power Control (ATPC)

• Integrated overvoltage protection

•Highly efficient STM-4 transmis-sion using low loss branchingunits

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polarisations. This doubles thetransmission capacity, so that,depending on the frequencypattern, up to 6xSTM-1 or oneprotected STM-4 signal can be

transmitted via one antenna. Ahigh system gain is achieved bya very robust 16 MLQAMmodulation which allows thesignal transmission in 55 or 56MHz channels. The high systemgain offers the possibility totransmit the STM-1 signal over longer distances than it is possible with higher modulation schemes. If frequency israre, the high spectrum efficient 128 MLQAM modulation allows maximum transmis-sion capacity .Together with the implemented automatic transmit power control

(ATPC) that supports the maximal range of 15 dB a high frequency reuse is guaran-teed. The use of ATPC reduces the effects of co-channel and adjacent channel in-terference in a microwave radio network with high traffic density and considerably

reduces thepower consump-tion under normalconditions. Thehighly flexible,software-controlled ATPCallows the correc-tion of up- anddown-fading and

can easily be adapted to local conditions by configuring the best received signal leveland transmit power. The transmit power level in operation is controlled by the re-ceived level over an control channel that allows optimum performance of the link withminimal bit errors even in case of intensive rainfall.

Protection switching

Various additional protection switching functions, such as 1+1 line protection and hotstandby increase the availability

and quality of the transmissionlink. Because of flat fading un-der bad weather condition in theshort-haul frequency bands theprotection cannot avoid trans-mission degradation but it offersbit error free protection switch-ing in case of equipment faults.This kind of switching is calledline protection. It offers an highsystem gain solution because

there is no additional loss pro-duced by switching componentsin the transmission link.

Transmit power 18 dBm

Hop length

15 dB

Transmitter

Receiver

Receive level

-30 dB

-50 dB

Hop lengthcontrol channel

-60 dB

Automatic Transmit Power Control (ATPC)

STM-1

STM-1

IF (coax 50 Ω)

U p t o 3 0 0 m

1+1 hot standby (HSB)

with low loss RF-switch

and error free BB-switch

1+1 line protection

using two frequencies

and one or two a ntennas

1+1 line protection

using two polarisations

and one (or two) antennas

1+1 protection mechanism (Hot standby, line protection)

0 5 10 15 20 25 30

Path Length / km

MDRS 155/18700-16 MLQAM C

32 mm/h

42 mm/h

57 mm/h

83 mm/h


32 mm/h

42 mm/h

57 mm/h

83 mm/h


32 mm/h

42 mm/h

57 mm/h

83 mm/h


32 mm/h

42 mm/h

57 mm/h

83 mm/h

0,15 m

0.3 m

0.6 m

1.2 m

2 m

Antenna

diameter

General remarks: Line of sight; BER=2x10-5; without interference; without multipath fading; horizontal polarization

E H K

131 min 0.025% 13 20 26

52.6 min 0.01% 22 32 42

26.3 min 0.005% 31 44 57

13.1 min 0.0025% 45 59 75

5.26 min 0.001% 70 83 100

Rain rate [mm/h]Outage time per year

Rain rates of areas E, H and K acc. to ITU-R Rep. 563-3

Maximal reachable hop length dependent of the local rain-rate

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The microwave radio line protection switching is independent of SDH network pro-tection switching and is implemented as Regenerator Section Protection. Any exist-ing Multiplex Section Protection (MSP) or Subnetwork Connection Protections(SNCP) are not affected. The control channel required for microwave radio protectionswitching is transported in a media dependent byte of the Regenerator Section

Overhead.The switchover at the receiving side is performed in the baseband bit-synchronouslyand therefore without interruption. In case of line protection the switchover is bit-error free. Error pulses or early warning pulses and alarm signals from the system areused as criteria which lead to a protection-switching before the implemented forwarderror correction (FEC) is unable to correct the faults.As an option the integrated 1+1 protection switching can be upgraded to a n+1 or n+2 protected configuration. Subsequent extensions up to 4+2 or reductions back to1+0 can be implemented without interruption. If only one channel is available in thefrequency band, equipment protection can be optionally implemented with a 1+1 hotstandby configuration.

System description

The systems MDRS 155 S, MDRS 155 N and MDRS 155 C consists of 3 independ-ent system components. The antenna, the outdoor unit and the indoor unit.

The size of the antenna depends on the re-quirements and can vary from 0,15 m up to 2m. Part of the antenna is the feeding systemwhich is available for dual and single polar operation.

The outdoor unit (ODU) is mounted close tothe antenna and is connected via flexiblewaveguide. Integrated solutions withoutwaveguide are also possible. In case of hotstandby protection a low loss switch con-nects 2 ODUs to one antenna. The ODUcontains the transmit and receive amplifier.The transmitted signal is converted from theradio frequency to the intermediate fre-quency and vice versa. Integrated highly ef-ficient overvoltage protection componentsensure safe operation.

The indoor unit (IDU) is mounted inside a building and is connected to the ODU viaan easy to install coaxial cable. The distance between IDU and ODU can be up to300 m. The IDU consists of one single shelf and can be installed in ETSI or 19’’cabinets. Optional wall installation is possible.Features like ATPC and protection switching control, SDH baseband, wayside andservice channel processing, error correction, modulation and demodulation are donein this unit which is electronically configurable. The extremely large-scale integration

of the functions in ASICs and the use of the most advanced technologies allow notonly the dimensions and power loss to be considerably reduced, but also the avail-

Outdoor unit (right) and integrated 60 cm antenna (left)

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Special features:

• Easy to handle, equipment sup-plier independent, network man-agement concept

• Upgrade from 1+0 to 1+1 in thesame rack

ability and quality of the system to be substantially improved. Long years experienceand the close contact to our customers ensure these improvements.

There are two 16 MLQAM IDUs available, one which is optimised for natural coolingusing thermal convection (part of the system MDRS 155 N), the other one is opti-

mised in size with an intelligent cooling management (part of the systemMDRS 155 C). The components components of the two systems are compatible toeach other.The MDRS 155 S with the new 128 MLQAM IDU and ODU forms a new radio family.

MDRS 155 N

The indoor unit using natural thermalconvection is designed in a modular way.An upgrade from 1+0 or 1+1 is possible.The upgrade can easily be done by adding

modules to the 1+0 shelf. Modulator,demodulator and the central power supply of the system can be protectedon demand, if required. The flexibleshelf is 9 HU in height.

As option, an overvoltage protection for

the indoor unit is available. This com-ponent is mounted on top of the shelf.No additional overvoltage componentsare required.

The integrated network managementconcept offers flexible configuration of allparameters. To get remote access to theequipment and to connect the radio sys-tem to the used network managementtool, embedded 64 kbit/s channels of the

STM-1 signal are used. The embeddedchannels ensure an easy to handleequipment supplier independent networkmanagement connections. The stan-dardised STM-1 baseband interface en-ables electrical or optical interfacing toother systems with adaptable connectors.

Indoor unit in 1+0 configuration

Indoor unit in 1+1 configuration

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STM-1

STM-1

Loop 2 (18/23 GHz):

•IDU testable

•ODU testable

Loop 1:

•IDU partly testable

i.g. el/opt STM-1 interface and mod-/demodulator

Loop 3:

•ODU testable

•IDU testable

without el/opt STM-1 interface

Loops for fault diagnostics

MDRS 155 C

Further developments, a higher integration of functions and the optimisation to a 1+0 con-figurations allows the reduction in size of theexisting indoor unit without quality reduction.The shelf was reduced to 1 ½ HU, that en-ables a rack installation in only 2 HU includ-ing the required cabling and cooling. Thermalmanagement which is highly critical for such

compact devices is performed by an intelligent thermal central subsystem. This sub-system protects the unit safely against damages in case of overheating and enablesthe exchange of fans in operation without traffic interruption. The fan redundancyallows a safe operation in case of faults. The fault case is reported to the network

management tool, where thepreparation of the repair can bedone remotely. A variety of loops are implemented tosupport this remote diagnosticas comfortable as possible. Anautomatic revertive behaviour

of the loops protects againstremote operation faults.

The integrated network management concept offers flexible configuration of allparameters. To get remote access to the equipment and to connect the radio systemto the used network management tool, the standardised embedded communicationchannel (DCCr) is used. It offers a 192 kbit/s channel and is transported in the SDHsignal. Optional the second data communication channel (DCCm) is supported. The

use of these standardisedchannels ensure an easy plug-and-play solution together with

all involved network elementsas e.g. SDH multiplexers. Noadditional cables are requiredto connect the system to thenetwork management tool.Communication channel re-dundancy is achieved by theimplemented multiprotocolrouters for the virtual networkmanagement connection whichsupports OSI- and TCP/IP-routing. The routers connectthe network element automati-cally to the network manage-

Compact indoor unit in 1+0 configuration

Special features:

• Intelligent thermal management

• Flexible network managementconcept which supports aneasy to handle multiprotocolrouting (QD-2, OSI, TCP/IP)over DCCr/DCCm

• Integration of SNMP managednetwork elements

• Additional 2 Mbit/s ’wayside’channel

• Changeable fans without trafficinterruption

LAN

LANLAN

RedundantServiceOn Access

Network Control Centre

ServiceOn Access

Network Control Centre

SDH-Subnetwork

managed via

ECC (DCCr or DCCm)

LAN/MAN/WAN

RS-485

QD2 managed

equipment

LAN/MAN/WAN

LAN

LAN/MAN/WAN

LAN

SDH-Subnetwork

OS of SOA

SISA-0

SISA-V

Agent MasterSISA-V

NE

Agent XQI

SISA-V

XQI

Universal network management concept using OSI routing

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ment tool after power on or in case of a connection loss using the shortest possiblepath. This lead to a easy self-healing network management solution with a maximumof redundancy. The communication to the network management is package orientedand with the routing protocol TCP/IP it is possible to integrate external SNMP man-aged equipment to the network management tool using the same virtual channels.

No additional fixed lines and no external routers are required to manage this equip-ment.The picture above shows other ways for easy operation and maintenance usingTCP/IP routing. Whether local or remote access with the local maintenance terminal(LMT) over RS-232, WAN or modem is required or maybe a redundant networkmanagement tool should be used. There are plenty of possibilities to integrate andmanage the whole network. Even different SDH subnetworks can be connected over an existing LAN/MAN/WAN connection to manage it as one network. If this networkgets too complex, it can be divided in different islands which can be operated fromdifferent regions as parts and from a central station as a whole.This universal philosophy reduces space, cost and complexity enormously and

makes it very easy to operate a growing network.

The standardised STM-1 baseband interface enables electrical or optical interfacingto other systems. The new connector type (LC) or the optical interface offers a newdimension of insertion loss (<0.1 dB) and a outstanding return loss (>55dB) whichallows long fibre length. The high-performance connector is easily and rapidly fieldinstallable and permits the use of single-mode and multimode fibres. If the opticalmodule is in use, monitoring of the STM-1 signal over the electrical STM-1 interfaceis possible.

The upgrade from an unprotected 1+0 to an protected 1+1 system is done by addinga second indoor and outdoor unit. The switching is done with the integrated protec-tion unit which offers a highly reliable system.

Optional plug in modules are available to build up a comfortable orderwire network.With this additional module a complete and cost effective private telecommunicationnetwork can be build up. Up to 1000 configurable numbers are supported. A number of 3 digits addresses a connection to a normal telephone (PHONE) or a private

automatic branch ex-change (PABX). To con-nect different private tele-

communication subnet-works, the extension in-terface (EXTEOW) can beused. Two additional 64kbit/s interfaces are avail-able for further extensions.To build up the privatetelecommunication networkthe standardised engi-neering orderwire byte (E1)of the STM-1 signals are

used.

Optional engineering orderwire functions:

Up to 1000 configurable numbers

Up to 7 usable interfaces

l 4 digital interfaces (64kbit/s)

l Telephone interface (PHONE)

l Privat Automatic Branch eXchange interface

l Extention interface (EXTEOW)

4 wire (analog)

E1 byte (STM-1 radio)


PABX2 pair wire

64 kbit/s ( G.703/codir.)

64 kbit/s ( G.703/codir.)

E1 byte (STM-1 line)


E1_R E1_L PAB X

EXTEOWEXTEOW

PHONE

EOWPABX

EXTEOW

PHONE

E1_R: 64 k bit/s (G.703/codir.)

E1_L: 64 kbit/s (G.703/codir.)



Optional engineering order wire functionality

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MDRS 155 S

The MDRS 155 S completes the short-haul

radio family by a high spectrum efficient 128MLQAM modulation. Therefore the provendesig

n of the MDRS 155 C radio was enhancedwithout changing the well known features.That maximises transmission capacity whileminimising operation costs.

Protected STM-4 transmission

The DPU STM-4 system component, which isconnected to the STM-1 microwave radiounits, permits the transport of STM-4 datastreams via a Regenerator Section in theSDH network. This application meets all thecriteria for use within STM-4 trunk networksand STM-4 ring networks. All logic and opera-tional functions are implemented in a singleintegrated chip.Four STM-1 microwave radio systems are required to transmit one STM-4 data

stream. An integrated protection switchingunit permits these systems to be protectedin a hitless and error-free way. In such aconfiguration, up to two further STM-1channels can be used for protectionswitching. This increases the quality andavailability of the STM-4 signal with highbandwidth efficiency. A separate procedure

permits the efficient transmission of partially occupied STM-4 data streams. Only theSTM-1 frames occupied within the STM-4 signal are transmitted by means of thecorresponding number of STM-1 microwave radio systems. Unoccupied STM-1 sig-

nals are replaced in the STM-4 signalby an ‘Unequipped Signal’.

For this application, the protectionswitching system can also be operatedin n+1 and n+2 or configurations.

Using the DPU-STM-4 enables theoperator to migrate from STM-1 toSTM-4 without link reengineering andtraffic interruption.

Data Processing Unit DPU STM-4

MDRS 155

MDRS 155

MDRS 155

MDRS 155

MDRS 155

RS (Regenerator Section) RSRS

MDRS 155

MDRS 155

MDRS 155

MDRS 155

MDRS 155

MDRS 155

MDRS 155

STM-4 STM-4DPU

STM-4DPU

STM-4

(4+2) x STM-1

Protected STM-4 transmission using up to six independent STM-1short-haul microwave radios

Features:

• Easy migration from STM-1 toSTM-4 without link reengineering

• Protection-mechanism up to 4+2

• Full integrated in network man-agement

Com act indoor unit in 1+0 confi uration

Special features:

• High spectrums efficiencythrough 128 MLQAM

• Optimised power supply (–48 V)

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Antenna Gain Frequency Band

Antenna size 18,7 GHz 23 GHz 26 GHz 38 GHz

0,15 m - - 30,3 dB 33,7 dB

0,3 m 33,0 dB 34,7 dB 34,8 dB 38,5 dB

0,6 m 38,5 dB 40,2 dB 40,5 dB 44,7 dB1,2 m 44,5 dB 46,0 dB 47,1 dB -

2 m 48,5 dB 50,0 dB - -Typical antenna gain depending on the antenna size and the used frequency

AntennasAntennas are key elements in radiosystems. For this reason, Marconidoes not rely on suppliers in this

sector, but develops and manufac-tures its own complete, modular antenna range for a wide variety of applications and for optimum di-mensioning and design of radiotransmission systems.

The product range for short-haulSDH microwave radio systems in-cludes high system gain parabolicand lense antennas in all the sup-

ported frequency bands (18 to 38 GHz) and ina variety of performance classes (standard andultra-high-performance). The ultra-high-performance antennas are optimised for maxi-mum frequency re-use in dense urban areasoffering an excellent front-to-back ratio. De-pending to the application, the antenna can beminimised in size (0.15 to 2 m) which reducethe infrastructure cost to an minimum and al-lows smart installations.

Crossed polarisation are supported in allfrequency ranges for even more efficientuse of the frequency spectrum by usingdual polarised feeders instead of singlepolarised.

The following tableshows the antennagain of the used ul-tra-high-performanceantennas. For more

details and other optimised short-haulantennas pleasehave a closer look toour antenna bro-chure.

Short-haul radio relay station in Hamburg

Short-haul radio (Outdoor unit) with integrated

30 cm antenna

Single and dual polar-ised antenna feeder

Short-haul radio (Outdoor unit) with integrated 60 cm antenna

15 cm lense antenna

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Technical characteristics

MDRS 155 N MDRS 155 C MDRS 155 SFrequency range 17.7 to 19.7 GHz (CEPT T/R 12-03 E)

22.0 to 23.6 GHz (CEPT T/R 13-02 E, Annex A)4.5 to 26.5 GHz (CEPT T/R 13-02 E, Annex B)

37,0 to 39,5 GHz (CEPT T/R 12-01 E, Annex A)Transmission capacity 155,52 Mbit/s (STM-1)

Modulation type 16 QAM (55/56 MHz) 16 MLQAM (55/56 MHz) 128 MLQAM (27,5/28 MHz)

Operating mode Adjacent-channel operation (ACDP) and Co-channel operation (CCDP)

18 dBm ±2 dB 16 dBm +2/-1 dB

Transmit power at C’18.7 / 23 / 26 GHz38 GHz - 15 dBm ±2 dB -

ATPC range 15 dB

Receive level at CBER = 10

-3/ 10

-6/ 10

-8typ./gar.

18.7 / 23 GHz26 GHz38 GHz

-(78/75/74) / -(75/73/71) dBm-(76/73/71) / -(72/69/67) dBm

–(71/68/65) / -(67/64/61) dBm

-(70/67/65)/-(66/63/61)dBm-(69/66/64)/-(66/63/61)dBm

-

CMI, to ITU-T G.703CMI, to ITU-T G.703S-1.1, to ITU-T G.957

-CMI, to ITU-T G.703S-1.1, to ITU-T G.957

Baseband interface140 Mbit/sSTM-1 electricalSTM-1 opticalSTM-4 optical S-4.1, S-4.2, L-4.1, L-4.2, to ITU-T G.957

2x E1, 2x F1, 1x E2, 1xF2,

64 kbit/s each, codirec-tional, to ITU-T G.703

2x E1, 2x F1

64 kbit/s each, codirectional, to ITU-T G.703

Service channelsDepending on application up to

4x 64 kbit/s, codirectional, to ITU-T G.703

External device interface 8x inputs 10x inputs and 3x outputs

Engineering orderwire PABX , telephone, 4x 64 kbit/s, expansion interface

Auxiliary channel - 1x 2 Mbit/s, 120 Ohm, to ITU-T G.703

Protection switching 1+1 Hot-Standby

1+1 Line-ProtectionOperation Service-PC (MSP) or

ServiceOn AccessLocal Maintenance Terminal (LMT) or

ServiceOn Access

Management interface F- and Q-interface (RS-232, RS-485)

F- and Q-interface (RS-232, RS-485, 10BaseT)

Power supply +- 24/48/60 V DC +- 48/60 V DC 2x - 48 V DC (red. Input)

Power consumptionincludes EOW (optional card)

1+0 (18.7/23 GHz)1+1 (18.7/23 GHz)1+0 (26 GHz)1+1 (26 GHz)1+0 (38 GHz)1+1 (38 GHz)

100 W175 W120 W200 W

--

70 W140 W86 W172 W86 W172 W

75 W150 W90 W180 W

Temperature rangeOutdoor Unit (ODU)Indoor Unit (IDU)

-33°C to +40°C, to ETSI ETS 300 019-1-4, class 4.1-5°C to +45°C, to ETSI ETS 300 019-1-3, class 3.2

HxWxD: 485x310x170 mmMechanical dimensions (ODU)14 kg 12 kg 12,5 kg

ETS 300 119-4

HxWxD: 400x483x280 HxWxD: 66,75x435x228 mmMechanical dimensions (IDU)

4,75 kg 5,5 kg

Mountable in ETSI or 19’’ cabinet

Typical/Guaranteed values. Technical characteristics subject to modification. 8. October 2001

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