RADIOLINK SYSTEMS Nokia MetroHopper 58 GHz
Contents
1. Instruction of the assignment RADIOLINK SYSTEMS Nokia MetroHopper 58 GHz 1 TABLE OF CONTENT 1 2 3 4 5 APPENDIX Bros E 1 TABLE OR CONTEN T 2x5ssassasa NEN 1 ABBREVIATIONS 2 ASSIGNMENT osien O a aao ESAN 3 3 1 PREREQUISITES ot aE AEE AN a n E AE A EE E E LR 3 3 2 GROUP EE cone AAF IE Sa E 3 3 3 GENERAT INFORMATION r eas ea EEEE 3 3 4 PASSING THE ASSIGNMENT ccsseseccccceessececcessseeeccecsseeceseeusseeeeeessseeeseecsaeeeccessenenecesseasaeeeeesuaeesceeseaees 3 3 5 GRADING OF THE ASSIGNMENT me e eE AS EE RTE 4 3 6 BACKGROUND OF THE ASSIGNMENT sscceccessseeeceecesecceceeussceeseessaeeeceessaeeeccesssnuseceseesaaeeeseusaeseeeseaees 4 PRELIMNARY ekaan 5 INSTRUCTIONS saanee ten Sta i EE EN SIT n Taa sea EE E ES 7 5 1 SETTING UP THE EQUIPMENT cccccccceccessesseeseesseeceeceeccececeeceeceesueausessessesseeceeceeceeceeseeeeeseessauaesseseeeess 7 5 1 1 Indoor unit FIU LO sanomatta ne Aaa enS aan maat 7 5 1 2 Outdoor Unitas Broek cies A ANNETA aa BSN M Tania 8 5 2 MEASUREMENT 1 DIRECT CONNECTION ANTENNAES IN THE SAME2. 9 5 2 1 se e wees SAREE Lee Cas ERA naw aa en PU 10 5 2 2 COMMISSIONING Kas Ue Neate SEE oe EN AS ESSA ate 12 5 2 3 Measurements Gnd Questions isc E E 16 5 3 ARRANGEMENT 2 DIRECT CONNECTION WITH PCM 1 6 16 5 3 1 Measurements and GUestions s a salsaa vedanta AN Aa s ALIA IN ASNT ah asa 18 5 4 ARRANGEMENT 3 A CONNECTION WITH PASSIVE MIRROR ssssssseeceeceececcecceeceeceeceesseausesseneeseeseeeeeess 19 5 4 1 Alinging the antenna by using amen aan e eaa enaa e naa eaa eee 19 5 5 ARRANGEMENT 4 CONNECTION WITH A PASSIVE MIRROR WITH 2 MBIT S SIGNAL 000se0eeeeeeeeeeeees 20 5 5 1 Initializing network analyzer and generating the 51 amp 1 21 5 5 2 CONNECT ON SA asa ka vanhaa ANN SA MAN SAE VS nah E a CSKA Niel Wid acd LON LMN SA 21 5 5 3 Measuremetns and GuestiOns ccooossossnsn aE na ana a aan naa aan naan iNi atia 22 5 6 ARRANGEMENT 5 MEASUREMENTS FROM THE TEST INTERFACE 24 5 6 1 Measurements and E O E T r a ea araa a ra a r a aeae aaa ie aeae 24 OPHONAE VOLUNTARY PART 26 6 1 EE AEE EIEN EEE 26 6 2 FORCED CONTROLS 25 2 TATTI 26 FEEDBACK ABOUT THE ASSIGNMENT cssscsscesceccececccccccccccccecc
3. mae amsa 1215 Figure 9 Opening window of the Nokia Hopper Manager Establish the local connection between the programme and MetroHopper For that you can select Manage gt Connect Locally or push a button Connect locally from 11 the window bar The program initiates the connection to the Metro Hopper and after which the window looks like in figure 11 Nokia Hopper Manager Type Hopper 19 Q1 port addr 3996 LMP port addr 666 Name Ylempi master File Edit Manage Configure Cross connections Alarms Maintenance Tools Window Help osae e 5 21 7 Equipment View Name Ylempi master Node Type Hopper 19 For Help press F1 Figure 10 Metro Hopper Manager window for a working connection In the windows are visible indoor and outdoor units received power signaling leds of the units and the names of the units together with some of the choices The MetroHopper continues from the state where it was during the shut down If during switch off a connection was established the Metro Hopper attempts to reestablish it that is the reason if the connection is established automatically Initiate a new connection even if the connection was established 5 2 2 Commissioning You can start a connection by using a commissioning wizard It starts by selecting Manage Commission During the startup the program asks the required parameters and based on those attempts to establish a connection 1 Co
4. The establishing connection starts from master unit Click Configure Settings select OUIA MetroHopper Program opens a window figure 13 14 Metrohopper Settings MetroHopper MetroHopper X Radio Settings Transmitter mode Operating TDD v Hop end mode Ju Forced sunchranising master Transmission channel 58 050 GHz Channel s Hop ID 3623113830 Interleave status or v Commissioning mode Manual channel selection Autosearch Figure 13 Control window of outdoor unit Select Manual channel selection and click Channel s this operation measures the channel interference levels Select the reguired channel change the Transmitter mode value to Commissioning and check that Hop ID and Interleaving status are in the both sides the same Select OK and repeat this set up in the slave side The method described above can also be used for changing settings of an outdoor unit When you change settings remember always to measure channel interference levels since in some reasons the program does not let you to change the settings e Follow AGC voltage during connection setup what happens Why Set the system clock that is necessary for acguiring right timings into log files You can change the time from Configure Set Node Clock Remember to set the time in both sides of the connection Check the connection state by observing the alarms from Curre
5. ABOUT THE ASSIGNMENT Your feedback will help us to develop the laboratorywork We would like to know e What was the most difficult part why e What was interesting why e Did teh work teach you anything what e What you would have liked to learn more about e Comments and proposals for improvents 27 8 ADDITONAL MATERIAL AND REFERENCES 8 1 Literature e Simon Haykin Communication systems 3ed e Arto Lehto Antti R is nen Millimetriaaltotekniikka e Antti R is nen Arto Lehto Radiotekniikka e Pentti Teppo Siirtoj rjestelm t tietoliikennetekniikassa e Fawwaz T Ulaby Fundamentals of Applied Electromagnetics e Kirsi Voipio Seppo Uusitupa Tietoliikenneaapinen 8 2 Standards e ITU T Recommendation G 703 10 98 Physical electrical characteristics of hierarchial digital interfaces e ITU T Recommendation G 826 2 99 Error performance parameters and objectives for international constant bit rate digital paths at or above the primary rate e ETSI Standardi ETS 300 408 v1 2 1 2000 09 Fixed Radio Systems Point to point eguipment Parameters for Radio relay systems for the transmission of digital signals and analogue video signals operating at around 58 GHz which do not reguire co ordinated freguency planning ETSI Syyskyy 2000 8 3 Internet e Telehallintokeskus Radiolinkkien k ytt taajuusalueella 57 2 58 2 GHz http www thk fi suomi radio radiolinkit58 htm 2
6. system if the tendon length is 50 m and the freguency 58 GHz 9 Calculate the free space loss in the connection when a passive mirror is used figure 2 The tendon length is 50 m and the freguency is 58 GHz The attenuation due to the reflection in mirror is 25 dBm 1 68 m 24 18 5 m Figure 2 Usage of a passive mirror in the laboratory measurement 10 Calculate the received signal power level received in system in figure 2 The system parameters are selected for Nokia MetroHopper radio link INSTRUCTIONS 5 1 The actual measurements are divided into four parts First the use of the equipment and the control of MetroHopper will be practiced with a Nokia Hopper Manager programme The setup is a direct connection and the distance between the antennas is few meters In this setup the correct settings and the effect of polarization on the connection are tested I the second part a the connection is made by using a passive mirror I the opposite wall seen from the window is a visible part of aluminium that serves aS a passive mirror When the connection is established the signal is transmitted and cross connection attenuations alarms are tested by using the test interface The measurements and the questions to be answered for the final report are usually found under their own heading In the text under each heading there are also few questions that have to be answered in the final report Setting up the
7. 155 Loss of seguence synchronization O Ol RDMAIS Yellow Remote defect indication payload Alarm indication signal yellow O Ol FAS CRC Frame alignment signal errors payload Cyclic redundancy check error OO Test sequence errors bit errors Figure 14 ANT 20E signalling leds 3 Measure with ANT 20E BER for different attenuations For that set the measurement time by clicking in the ANT 20 window Measurement Settings and select Gate Time to be 10s confirm the selection by clicking OK The measurements starts by clicking on green traffic light in ANT 20 window The 23 measurements results are interpreted in Anomaly Defect Analyzer window We are interested in the measured quantity TSE that corresponds to the BER of the test signal The numerical values of TSE are read by clicking on View Num Compare the results measured by the network analyzer and Nokia Hopper Manager Connect the signal to be in a loopback for that set a loop into one of the MetroHoppers indoor plug in units and signal input output of the other MetroHoppers plug in units to the ANT 20E figure 16 4 Measure the delay again Is there any difference compared to the previous measurements if yes explain why 5 Repeat the BER measurements with network analyzer Why there will be a difference compared to previous measurements 6 Connect two way PCM system Adjust the attenuation to create a lot of errors Check the signal from t
8. 8 e Telehallintokeskus Radioliikenne http www thk fi suomi radio index htm e Telehallintokeskus Taajuusjakotaulukot http www thk fi suomi radio taulu htm e Telehallintokeskus Taajuusjakotaulukot osa V 31 000 400 GHz http www thk fi suomi radio Taulukko5 htm e Telehallintokeskus Luvanvaraisten radiol hettimien m r vuodesta 1994 alkaen http www thk fi suomi radio lupatilasto htm e Telehallintokeskus Paikallisverkkokilpailuun lis mahdollisuuksia maailman radiokonferenssi antoi lis taajuuksia laajakaistaisille Internet ja multimediayhteyksille http www thk fi suomi ajankoht wrcfwatiedote htm e Telehallintokeskus Luvanvaraisten radiol hettimien m r vuodesta 1994 alkaen http www thk fi suomi radio lupatilasto htm e Telehallintokeskus Radiolaitteiden k ytt ja luvat http www thk fi suomi radio n2436 htm e Sosiaali ja terveysministeri P t s ionisoimattoman s teilyn altistuksen enimm isarvoista Sosiaali ja terveysministeri n p t s nro 1474 1991 http finlex4 edita fi dynaweb stp stp 1991sd O ebt link showtoc false target IDMATCH id 19911474 sd 8 4 Other publications e Nokia Networks Oy Nokia MetroHopper Radio User Manual Nokia Networks 2000 e Tomas Sehm A High Gain 58 GHz Box Horn Array Antenna with Suppressed Grating Lobes IEEE Transactions on Antennas and Propagation Vol 47 No 7 July 1999 29
9. IMNARY ESERCISES The purpose of the preliminary exercises and of laboratory work is to give a practical picture of the basic choice and possibilities of radio link systems next to the mere theory The theory and preliminary exercises facilitate in doing the laboratory measurement themselves When making exercises try to think how the matters would have been carried out in a separate freguency band in some other radio link system The solved preliminary exercises should be returned to the return box of the course The assistant provides feedback about the laboratory exercises and if everything is in order you can reserve the laboratory shift for the measurements 1 Where are the radio links used Why 2 What is the Fresnel zone What does it mean to a radio link Calculate the maximum diameter of the 1 st Fresnel zone for 58 GHz radio link The tendon length is a 1 km b 50 m 3 What are the special properties of 58 GHz radio freguency How these properties can be utilized in radio links 4 List usage cases applications where MetroHopper radio links can be used where when what is transmitted used interfaces 5 List the benefits of digital modulation methods 6 Explain the concepts TDD BER MSK Q funktio ja AGC 7 Explain shortly what the following units mean dBm dBW dBi A m V m and W m Prove the claim about dangers to health stated in the chapter 2 4 8 Calculate the free space loss of a radio link
10. MetroHopper and the program opens a window similar to one on figure 13 Stop the connection establishment if the unit is in state Commissioning Comm 2 Set the units Transmission mode to Receiving only Rx state in that state the unit operates only as receiver 3 Ensure that the Commissiong mode is in state Manual Channel Selection and click Channels button Now MetroHopper measures the interference levels of the channels Write the values up 4 Select the channel with the smallest disturbance level N B if the second transmitter sends a signal it is seen as an interference Click OK 5 Click again OK and return to the basic state 6 Stop the commissioning in the slave unit if it has not yet been stopped 7 Set the units Transmission mode into state Forced transmit Tx in which it transmits incessantly Change the variable Hop end into master only the master can be set into Tx state 8 Repeat the section 3 to that unit 19 9 Add the interference levels from measurements in section 3 and 8 and select the channel with the lowest interference level 10 Click OK and return into basic state Slave unit should send not incessantly 11 Return back to master unit Change the frequency of the master unit to be same as of slave unit Now the units should be on the same channels 12 Adjust the outdoor units direction by focusing screws with the help of the small adjastable spanner Be careful not to turn too muc
11. acles will be added by turning them in from of the antenna By changing the angle of the blinds the attenuation between the MetroHoppers is increased The attenuation impacts the signal propagation and number of errors alarms and the relation of errors to the attenuation can be studied In this measurement we simulate the conditions occurring due to the weather in long radio link connections Before modifying the attenuation measure the capacity of MetroHoppers Select the length of the measurement period by clicking Tools gt Options gt Manager Options and set the interval between the measurements to be 10s That is the smallest possible measurement time Start the performance measurements for MetroHopper from Nokia Hopper Manager by clicking Maintenance Performance gt Measurements and select the bit error rate BER measurement for the connected Flexbus from FIU 19 and Rx level measurements for 22 the indoor unit Store the results into a log file Start teh monitoring of alarms by clicking Alarms View and save also those into a log file Start the monitoring of statistics for the Flexbus you are using Maintenance Performance Statistics 2 Measure BER with different attenuations When increasing attenuation be careful not to break connection During the measurements also monitor the alarms Draw the graph BER versus attenuation attach the it alarms and explain why they were created Also monitor the leds of
12. ccsscssssssscescesceececescescccsscessesses 27 ADDITONAL MATERIAL AND REFERENCE G ccccsscssssssscssscsscesceecceceececccecccccccscecsssssscescesce 28 8 1 LITERATURE 28 8 2 STANDARDS matte N SATEISEN NN NIM SSN a annan 28 8 3 INTERNET mos asda Hin EN Pam E ISIS E 28 8 4 OTHER PUBLICATIONS i s esi msn SALASSA MAT LANNE 29 2 ABBREVIATIONS AGC FBI FB2 FLPY GND LMP MP TSE TX Automatic Gain Control Flexbus 1 Flexbus 2 Floppy Ground Local Management Port Measuring Point Receive Test Sequence Errors bit errors Transmit 3 ASSIGNMENT 3 1 Prerequisites The requirements of the preliminary knowledge and the material of the course Fixed Radio Networks S 72 173 or its equivalent is assumed to be acquired before this exercise 3 2 Group Assignment is done in the group of two persons 3 3 General information The laboratory work is done in the in the student laboratory E305 The purpose of the course is to provide student with knowledge about radio links systems and understanding where and how radio links can be used Additionally special properties of 58 GHz frequency are familiarized However it should be understood that Nokia MetroHopper is only one type of several radio links and it is used here only for demonstrating the general properties of the radio links The labora
13. equipment 5 1 1 Indoor unit FIU 19 The internal unit FIU 19 uses 48 V power supply that can be provided from connector on the windowsill in the laboratory The outdoor unit will be connected to the connector with Flexbus cable to connector FB1 or FB2 The maintenance computer COM port should be connected to LMP connector MP connector provides a test signal for an oscilloscope figure 3 3 0 Od 2 FB1 DC FB2 DC ji tb TO 59 MP LMP PWR Figure 2 FIU 19 indoor unit The plug in unit in figure 4 is connected to internal unit To each of the pairs of plug in unit can be connected 2Mbit s signal 1 2 3 4 IN OUT IN OUT IN OUT IN OUT FI G Figure 3 Plug in unit 5 1 2 Outdoor unit The outdoor units FB connection is connected to the Flexbus cable To AGC connector is connected a voltage meter that allows to measure AGC voltage In this laboratory work GND and Sync connectors are not used mm Kiinnitys ruuvi SAY N Figure 4 Connectors in the outdoor unit The outdoor unit can be connected as it is or it can be fixed to a special rack The connection into the rack and fastening of grip can be made only by usage of special screws seen on figure 6 Do not relax other screws then the rack will not bend If the stand bends the antenna should be redirected with use
14. h Do not loosen any screws Align the antenna to the position where the AGC voltage is the smallest You can get help from the Table 1 from the theorethical part of the assignment 13 Set the master unit to send continuously and the slave unit to receive continuously 14 Direct also the other antenna with help of AGC like in the section 12 15 Set the transmitter and receiver into state Commissioning Comm If a connection is not successful make sure that the AGC voltage is under 4 volt at the both ends If this requirement is not satisfied repeat the alignment of the antennas 16 If you do not succeed to make connection automatically you have to establish connection manually accordingly to the instructions given in section 5 2 2 1 After establishing connection take up the received power level and compare it with the values calculated in the preliminary exercises 5 5 Arrangement 4 Connection with a passive mirror with 2 Mbit s signal The 2 Mbit s signal is generated with the network analyzer ANT 20E The same analyzer is also used for the measurements 20 5 5 1 Initializing network analyzer and generating the signal Switch on the analyzer ANT 20E and the monitor Start the network analysing program ANT 20 Start a new ANT 20 Application by clicking on the upper window bar of the ANT 20 program window Select the following instruments Signal Structure and Anomaly Defect Analyzer and click OK For this measureme
15. he loudspeaker Has the voice changed How Why 5 6 Arrangement 5 Measurements from the test interface Disconnect the network analyzer and PCM system from MetroHopper and connect the oscilloscope to the measurement point MP of the indoor unit of MetroHopper A signal is directed to MP by selecting Maintenance Tests gt Measurement Interface Select the desired signal and click Send One can save the oscilloscope picture in the tif format by inserting a floppy disk to the drive and selecting Store and choosing Flpy as target saving place After pressing Screen Dump button the oscilloscope saves the displayed picture 5 6 1 Measurements and guestions 1 2M TX Data is a signal that is transferred between the indoor units in the Flexbus cable Direct 2M TX Data signal to the testing point MP and draw picture of it Identify the line coding that is used and interpret the sent data 24 2 Connect the two way PCM system to MetroHopper and repeat the measurements in case 1 What happened and why The signal does not need to be interpreted 25 6 OPTIONAL VOLUNTARY PART 6 1 Loopbacks Establish loopbacks between different parts of the system by selecting Maintenance Tests gt Loopbacks Investigate the transmitted signal by network analyzer for example look at delays 6 2 Forced controls Try different forced control options from the menu Maintenance Tests Forced Controls 26 7 FEEDBACK
16. nnection establishment begins by first selecting which FB connection is used Selection is made by marking the correct FB and selecting Start Program attempts to find the outdoor unit trough the FB connector and informs when the unit is found by text Radio Found 12 2 Name the unit and give the parameters that allow to identify this unit from other MethoHoppers In this laboratory works it is enough to name the units other parameters are not necessary Select the operational mode The options are terminal chaining branching Select Terminal The only option for the protection device is Single 4 Select the type of the Flexbus connector and which outside units are switched on The capacity of MetroHopper is constant 4 x 2 Mbit s 5 Select parameters for Ol port In the laboratory work we are not using Ol connetors therefore do not change any of these parameters 6 Establish connection over Ol bus for control traffic In this laboratory work Q1 bus is not used For not using Q1 make a connection accordingly to figure 12 Commissioning Wizard Configure the branching for the 01 management The branching alters the routing of 01 within the node and to connected units C 011 01 20n 0120n C 0110n AIO Processor mese Figure 12 The correct connection of control signals when O1 channel is not used Select parameters for the outdoor unit First you have to select the o
17. nt Alarms button Only alarm of Loss of incoming signal is allowed This alarm appears since there is no signal connected to the system 15 5 2 3 Measurements and questions At this first state there are two measurements effect of the directing antenna and polarization of the antenna on the received power level 1 Turn the antenna in the rack on the table in different directions and measure power and AGC voltage in different points with about 10 degree steps Draw a graph of the measurement results and compare the results to the theory explain the results Notice that the AGC voltage has a slight error because of the mismatch 2 Change the antenna polarization Take antenna into your hands and change the polarization angle Measure power and AGC voltage Draw the results in a graph and explain the results 5 3 Arrangement 2 Direct connection with PCM signal The transferable signal is added to the previous connection by using PCM system in the laboratory a room 306 The connection is made to two channels radio programme to channel 2 and to channel 4 a sine wave In these channels a 2 Mbit s PCM signal is transmitted through MetroHopper to the PCM system in the receiving end room 305 a rack on the work table The signals can be connected to the loudspeakers through the channel selector The PCM system is connected from one room to another and the MetroHopper is part of this connection The PCM signal can be checked also b
18. nts we need 2 Mbit s pseudorandom signal its Signal Structure is like in figure 17 Signal Structure 0 Auto Time Edit Interface Laser Channel Idle Trigger Aux Offset Help RX Figure 12 A 2 Mbit s pseudorandom signal in ANT 20 programme If a signal looks like something else you can edit it by clicking in Signal Structure window Edit Signal Structure In the Edit menu are TX and RX select Clear in both of them This allows you to generate the signal again Make the following choices to both sides TX and RX Edit ITU T Interface Electric PDH 2M and PDH mode Frm and click OK If the signal still is not in accordance with figure 17 consult with the assistant 5 5 2 Connections Establish a connection like in figure 18 trough the MetroHopperilla is send a 2 Mbit s signal generated by the network analyzer Validate the cross connection remove the possible alarms 21 J nnitemittari 7 2 Antenni 1 Antenni 2 radioyhteys Jannitemittari PCM laitteisto hallinta kone verkkoanalysaattori Figure 13 A connection where the signal from the network analyzer is transferred trough MetroHopper 5 5 3 Measuremetns and guestions 1 Measure the delay caused by the transfer trough the radio link For that click in the Signal Structure window Time Delay Measurement ja Start The parts of the Venetian blind curtain of the window are aluminium and the desired number of obst
19. of a passive mirror manually Figure 5 Connection of the outdoor a rack 5 2 Measurement 1 Direct connection antennaes in the same room Position antennas in front of each other such that it would be easy to establish a connection between them Establish a connection by using Nokia Hopper Manager program One antenna is hanged to the fastening handle in the work table left upper corner figure 7 Other antenna is fixed to the handler on the table on the other side of the room figure 8 Check visually that the antennas are directed towards each other and are about the same height Figure 6 The first antenna is connected to the fastening handle in the corner in the measurement table Figure 7 The second antenna is hung to a rack on the opposite table 5 2 1 Connections Make a connection accordingly to the scheme on figure 9 10 Jannitemittari Antenni 1 Antenni2 radioyhteys tA hallinta kone Figure 8 Schematics of the first simple connection Connect antennas to the internal unit by Flexbus cable You can use any of the FB connectors Connect voltmeter to AGC connector of the antenna Add the power supply unit and connect a laptop computer to the LMP connector of one of the indoor units Turn the units on and start the Nokia Hopper program On the screen should appear a window similar to the one in figure 10 Nokia Hopper Manager Manage Tools Help
20. perational mode the unit should be either master or slave You can use Synchronising master if many MetroHoppers are near by Temporary Hop ID a identification code that the system uses for establishing the connection After the connection is 13 5 2 2 1 established the system changes ID value Check that the both sides have the same temporary ID 8 Set the channel selection method MetroHopper has an automatic channel selection method that is recommended to be used here In the manual mode the user selects which channels to use In manual settings it is possible to measure the channels interference levels That method is used if channel is directed with of AGC voltage this method is explained below Select now AutoSearch and from the following page select all possible channels that the automatic channel search can use 9 Finally the system system presents all the selections you have made You still can check the set up and it is possible to cancel the modifications Choose Finish if you are satisfied with the choices 10 After submitting the selections it is still possible to check the system state 11 Add your name and reset the counters Repeat the set up also in the other side of the link For that change the computer to the connector of the other indoor units LMP connector and select Refresh Establishing connection manually If the connection is not established automatically you have to make connection manually
21. the network analyzer ANT 20E and write up the occurring alarms The meanings of leds are explained in figure 19 HISTORY O O Los Loss of signal O O LOF OOF Loss of frame Out of frame O OJ MS AIS AIS L Multiplexer section alarm indication signal Alarm indication signal line O Ol B1 B2 B1 or B2 Bit interleaved parity errors O O MS RDVRDIL Multiplexer section remote defect indication Remote defect indication line AU LOP LOP P AU Loss of pointer Loss of pointer path OJ AU AIS AIS P AU Alarm indication signal Alarm indication signal path O O HP UNEQUNEQ P High order path unequipped Unequipped path O HP PLMPLM P High order path path label mismatch Path label mismatch path O Oj B3 B3 Bit interleaved parity errors O O HP RDVRDI P High order Path remote defect indication Remote defect indication path O O TU LOM Loss of multiframe O TU LOP LOP V TU Loss of pointer Loss of pointer VT O O TU AIS AIS V TU Alarm indication signal Alarm indication signal VT O Ol LP UNEQ UNEG V Low order path unequipped Unequipped VT Oj LP PLMPLM V Low order path path label mismatch Path label mismatch VT O LP BIP BIP V Low order path bit interleaved parity errors Bit interleaved parity errors VT O LP RDVRDI V Low order path remote defect indication Remote defect indication VT O AIS Alarm indication signal payload O Oj LOF LCD Loss of frame payload Loss of cell delineation
22. ther units 2 Establish a cross connection in which the PCM signal goes to MetroHopper from the pair no 1 and will return from the pair no 4 3 In MetroHopperilla one can transmit 4 x 2 Mbit s in both directions In our configuration we are using 1 x 2 Mbit s in one direction Form a connection described on figure 16 and configure the cross connection table appropriately Draw a scheme of the required cross connection J nnitemittari N 5 Antenni 1 Antenni 2 J nnitemittari radioyhteys N 5 QG lt N gt J hallinta kone Figure 11 Connection where PCM signal in two directions at the same time 18 5 4 Arrangement 3 A connection with passive mirror Turn both MetroHopper units off disconnect the PCM systme from the Plug in units and disconnect the cables to the outdoor unit Put the antennaes to the racks next to the windows in the room E305 and E306 and establish a connection accordingly to instructions in the part 5 2 2 Remember to set the clock values for the indoor units 5 4 1 Alinging the antenna by using AGC voltage First check the direction of the antenna towards the mirror visually If the alignment seems to be very bad ask from assistant for permission for the turning of the antenna rack When the antenna direction seems to be correct fine tyning of the antenna can be made with help of AGC voltage 1 Start from the master unit Click Configure Settings select OUJA
23. tory work is planned to take about 15 20 hours depending on the background of a student 8 12 hours are reserved for handling preliminary material 3 hours are need from the laboratory measurements and the rest of the time is spent for analyzing the measurement results 3 4 Passing the assignment A student is expected to become familiar with radio link systems for that he is provided with laboratory material and course material Additionally there exists a plenty of literature for deeper examining the matter After becoming familiar with background information the student should make the preliminary exercises After submitting the preliminary exercises the group is allowed to reserve laboratory time Preliminary exercises and returning instructions be found in the chapter 4 of this document 3 5 Grading of the assignment The laboratory work is graded accepted rejected The rejected work should be corrected and resubmitted to the assistant 3 6 Background of the assignment The equipments used in this laboratory work are provided by the producer as a donation and the laboratory work has been developed from them The equipment is suitable for investigating the effect of weather in 58 GHz frequency band The assignment contains the equipments shown on figure 1 J nnitemittari N i2 Antenni 1 Antenni radioyhteys hallinta kone verkkoanalysaatton Figure 1 Eguipment in the laboratory work 4 PREL
24. y oscilloscope Telequipment D83 This oscilloscope is located in the right corner of the work table Before connecting PCM to MetroHopper check the PCM signal trough the loudspeakers Connect the PCM system to MetroHopper so that the signal coming from the room E306 will be connected to the inlet pair no 1 of one Plug in unit and PCM from the room E305 to the output pair no 1 of another Plug in unit of MetroHopper figure 14 16 Antenni2 radioyhteys hallinta kone Figure 14 Connection of the PCM MetroHopper systems Set the crossconnection for that select Cross connections View and edit cross connection tables of both indoor MetroHoppers units to be like in figure 15 This is done if FB1 is used The modifications are confirmed with Send button after which the program sends the modifications to the indoor units Nokia Hopper Manager Type Hopper 19 Q1 port addr 3996 LMP port addr Name EG IUA FB1 In use Figure 15 Cross connection table 17 5 3 1 Measurements and questions After establishing connections test both channels trough the loudspeakers Also check for any alarms in both devices In case of alarms attemt to correct them If you are not able to remove alarms just identify the reasons for them 1 In the cross connection table form a connection 2M Interface 1 IUA FBx 2 in both indoor units Why does the connection operate even connectors were not moved in ei
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