Ericsson Base Station F800 Field Service Manual Download Page 5

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DOCUMENT LIST

2 (3)

Uppgjord (även faktaansvarig om annan) -

Prepared (also subject responsible if other)

Nr -

No.

KL/ESE Rune Tapper

ECS/S/LT-96:1036

Dokansv/Godk -

Doc respons/Approved

Kontr -

Checked

Datum -

Date

Rev

File

KI/ESE (Rune Tapper)

1999-05-25 D

7. Spare parts list

Spare parts list

ECS/S/LT-96:5042

8. Service tools

LPC 102 213 F800 Test Handset

KTR97:2444

Fault tracing F800

KTR97:2486

Special service tools for F800

15/EN/LZB 115 681 R1 Uen

Service unit F800

15188-LPC 102 81 UX

F800 personality programming

ECS/S/LT:96-1014

9. Service information

Service information

SI95-011

Service information

SI96-003

Service information

SI96-004

10. Cabinet

F800 Radio base station concept

109 21-KRD 103 10 - 1 Uen

Cable

151 88-RPM 113 669 Ux

Cable

151 88-RPM 113 671 Ux

Cable

151 88-RPM 113 670 Ux

Cable terminal info F800

193 12-SXK 107 2274/4 Uen

Cable terminal info F800

193 12-SXK 107 2274/4 Uen

Connection cable

151 88-RPM 113 1511 Ux

Connection cable

151 88-RPM 113 1511 Ux

Connection cable

151 88-RPM 113 1512 Ux

Connection cable

151 88-RPM 113 1512 Ux

Connection cable

151 88-RPM 113 1513Ux

Fan kit

151 88-BKV 301 203 Ux

Connection cable

151 88-RPM 113 1703 Ux

Wiring diagram F800 MRS3000

107 31-SXK 107 2274/1 Ux

Wiring diagram F800 MRS5000

107 31-SXK 107 2274/2 Ux

Circuit board

1911-ROA 117 2010 Ux

Printed board

1078-ROA 117 2010 Ux

Station unit C700

151 88-NTM 201 57 Ux

Assembly drawing F800

151 88-SXK 107 2274/1 Ux

Wiring diagram transceiver unit F800

107 31-KRD 103 10 Ux

Assembly drawing F800

151 88-SXK 107 2274/4 Ux

11. Transceiver unit

Logic unit

3/EN/LZB 115 681 R1 Uen

F800 Circuit description

ECS/S/LT-96:5044

Logic board F800, circuit diagram

1911-ROA 119 8736 UEN

Logic board F800, mounting drawing

1078-ROA 119 8736 Ux

Summary of Contents for Base Station F800

Page 2: ...9 This manual is provided by Ericsson Mobile Communications without any kind of warranty Improvements and changes in this manual due to typographical errors inaccuracies in current information or improvements to programs and or equipment may be made by Ericsson Mobile Communications at any Cabinet 10 time and without notice These changes will however be incorporated into new editions of this manua...

Page 3: ......

Page 4: ... health risk ECS S LT 96 5032 A Handling MOS devices ECS S LT 96 5033 A Warning high voltage ECS S LT 96 5034 A Information about ESD LZT 109 170 Ue 3 Overview Product structure 1315 KRD 103 10 Ux B Mechanical structure ECS S LT 96 5035 A Manufacturing instruction 1510 KRD 103 10 ux A Coding scheme 1518 KRD 102 01 usv C 4 Technical specifications Ericsson F800 Technical data EN LZT 123 593 R3 F800...

Page 5: ...3 670 Ux A Cable terminal info F800 193 12 SXK 107 2274 4 Uen A Cable terminal info F800 193 12 SXK 107 2274 4 Uen B Connection cable 151 88 RPM 113 1511 Ux A Connection cable 151 88 RPM 113 1511 Ux B Connection cable 151 88 RPM 113 1512 Ux A Connection cable 151 88 RPM 113 1512 Ux B Connection cable 151 88 RPM 113 1513Ux A Fan kit 151 88 BKV 301 203 Ux A Connection cable 151 88 RPM 113 1703 Ux A ...

Page 6: ...apper ECS S LT 96 1036 Dokansv Godk Doc respons Approved Kontr Checked Datum Date Rev File KI ESE Rune Tapper 1999 05 25 D 12 Applications F800 as radio link S XT 95 7049 A F800 as repeater station ECS S LT 96 1013 A F800 as OEM station ECS S LT 96 1018 A Enclosure F800 Personality Programming Tool EN LZY 213 633 1 47 ...

Page 7: ...n unregistered copy and will not be updated This manual is provided by Ericsson Sverige AB without any kind of warranty Improvements and changes in this manual due to typographical errors inaccuracies in current information or improvements to programs and or equipment may be made by Ericsson Sverige AB at any time and without notice These changes will however be incorporated into new editions of t...

Page 8: ... safety precautions BERYLLIA SAFETY PRECAUTIONS Introduction This appendix details the safety precautions when handling components containing Beryllium oxide Dust from this material can present a health hazard unless adequate precautions are taken The hazard The material is highly dangerous in a dust form when it might be inhaled or enter a cut or skin irritation area If dust is caused as a result...

Page 9: ...omponents where they may rub together or break and disintegrate into dust be heated excessively normal soldering is quite safe be broken open for inspection or in any way abrased by tools Heat sink washers Some of the heat sink washers contain Beryllia When new these are packed individually They MUST NOT be stored loosely be filed drilled or any way tooled heated other than when clamped in heat si...

Page 10: ...RYLLIA COMPONENTS and returned for subsequent disposal Such components securely packed and with inside identification may also be returned directly to the manufacturer Broken components should be individually wrapped and identified as BROKEN BERYLLIA COMPONENTS They MUST NOT be sent through the post and should be returned to a depot by hand Medical precautions If Beryllia is believed to be on or h...

Page 11: ...not be incinerated or damaged in any way Exercise care when removing or installing this component to prevent physical damage The component which contains beryllium oxide is the RF amplifier It is located on the radio board inside the radio station The components have the beryllium oxide encapsulated and the component is safe to handle for replacement purpose Defective components or complete radio ...

Page 12: ...Lindahl ECS S LT 96 5032 Dokansv Godk Doc respons Approved Kontr Checked Datum Date Rev File KI ECS S LTC Ulf Brömster 1996 06 03 A 965032 doc WARNING HEALTH RISK Radio frequency radiation Exposure to the antenna RF field may be dangerous to your health Therefore SWITCH OFF THE TRANSMITTERS if you work with or near the antennas ...

Page 13: ...ductive surface e g metal table top when testing the circuits or transferring them from one carrier to another Electrically connect the person doing the testing or handling to the conductive surface for example by a metal bracelet and a conductive cord or chain Connect all testing and handling equipment to the same surface Signals should not be applied to the inputs while the device power supply i...

Page 14: ...er handling precautions should still be observed Until the sub assemblies are inserted into a complete system in which the proper voltages are supplied the board is no more than an extension of the leads of the devices mounted on the board To prevent static charges from being transmitted through the board wiring to the device it is recommended that conductive clip or conductive tape is put on the ...

Page 15: ...other person nearby who is familiar with the operation and the hazards of the equipment and who is competent in administering first aid When the technician is aided by operators he must warn them about dangerous areas Whenever possible the power supply to the equipment must be shut off before beginning work on the equipment Be careful not to contact high voltage connections when installing or oper...

Page 16: ... faktaansvarig om annan Prepared also subject responsible if other Nr No KL ECS S LT Magnus Lindahl ECS S LT 96 5035 Dokansv Godk Doc respons Approved Kontr Checked Datum Date Rev File KI ECS S LTC 1996 06 05 A Error Unknown switch argument ...

Page 17: ...rox 439 x 177 x 325 mm equipped with brackets for 19 rack mount 3HE Operating temperature range 25 C to 55 C Storage temperature range 40 C to 85 C Standards Meets or exceeds ETS 300 086 ETS 300279 TRANSMITTER Output power High 20 W 1 dB 6 W 1 dB for 370 415 MHz Output power Low 2 W 1 dB 0 6 W 1 dB for 370 415 MHz Adjacent channel power 70 dBc or 0 2µW Spurious emissions at operation 36 dBm 9 kHz ...

Page 18: ...proved Kontr Checked Datum Date Rev File KI ECS S LTC Error U k Error U k Error Unknown switch argument F800 Commissioning Contents INTRODUCTION 1 SITE INFORMATION FORM 2 F800 BASE STATION INFORMATION 3 INSTALLATION CHECK 4 SITE COMPLETED 4 Introduction The intent of this form is to make sure that the installation is performed and tested in such way that the customers and our requirements will be ...

Page 19: ...formation including F800 Base Station Information and Installation Check in the Site Documentation that is prepared for the site customer One copy must be filed at the local workshop Site identification Owner The key is available at Telephone no main operator Telephone no at site Number or name for the control line Servicing organised by Local workshop Telephone no Other important names telephone ...

Page 20: ...F800 Base Station Information Station unit number F80X transceiver unit type KRD 103 10 Serial number Line panel type Serial number Frequencies TX RX Traffic mode simplex duplex Power supply Mains power unit type Type of batteries Others Antenna installation etc If necessary please make up separate sketches and or drawings ...

Page 21: ...lation checked and tested Backup power installation checked and tested Antenna installation checked and tested Constant load Antenna Reflected W W W Equipment alarm system checked and tested Control lines installed checked and tested Earthing installed and checked Lightning protection installation checked Radio test to mobile units function OK Control unit s installed checked and tested Site compl...

Page 22: ...ECS S LTC 1996 06 04 A Error Unknown switch argument INSTALLATION Contents Introduction 2 Station unit 2 Base station 2 Preparation of installation site 3 Installation 3 Packaging 3 Unpacking 3 Wall mounting 4 Rack mounting 4 Safeguards for installation of lead acid accumulators 4 Connection instructions 5 Connection of power supply 5 Connection of antenna 5 Connection of signal cables 5 Installat...

Page 23: ...proposed station site under certain conditions or certain periods of the year In the event of planned extension or modification of radio equipment at an existing station site the service workshop concerned should be consulted Modification of a station site which is already fully utilized may interfere with rational servicing of the existing radio equipment Station unit The F800 station consists of...

Page 24: ...see the recommendations given in chapter 5 Arrange for an authorized electrician to lay the mains power cables or battery power supply to the installation site Arrange with the Telecommunications Administration for installation of telephone lines to the installation site and the lightning protection kit s INSTALLATION Packaging When delivered the station unit is packed in a special carton with sho...

Page 25: ...e possibility of folding out the lid and making the service more convenient Please note the space required for service Installation instruction 1531 SXK 107 2274 1 UX or 1531 SXK 107 2274 4 UX The station unit is now ready for connection Rack mounting It is also possible to install the F800 Base Station in a 19 inch rack Refer to Installation instruction 1531 SXK 107 2274 1 UX or 1531 SXK 107 2274...

Page 26: ...t the correct unit has been supplied connect the mains cable that has been laid to the site to the connector marked 13 15 V DC on the rear of the station unit When connecting to a battery power supply Prepare the cable for the battery supply as shown in chapter 8 Connect to the connector marked 13 15 V DC on the rear of the station unit Cable area required The voltage drop from the battery must be...

Page 27: ...ntation which should include specific instructions and documents to facilitate servicing of the installation The installation documentation should be available at the installation site and at the local workshop The installation documentation may include for example How access is obtained to the site keys etc General information on the power supply location of fuses and switches Information on cont...

Page 28: ... Approved Kontr Checked Datum Date Rev File KI ECS S LTC 1996 06 04 A Error Unknown switch argument LIGHTNING PROTECTION FOR MASTS Contents Introduction 2 Need for lightning protection 2 Explanation of terms 3 Lightning frequency 4 Properties of lightning strikes 4 Ground conditions 4 Inspection of installations 4 Choice of materials 5 Dimensions 5 High voltage input 7 Low voltage input 8 ...

Page 29: ...coming high voltage earth Before connection to the high voltage earth permission must be obtained from the power supply company Any parts of the installation which are hidden buried must be marked on the site drawing The purpose of these measures is to protect personnel and equipment from transients caused by lightning High voltages may arise through direct lightning strike to the antenna or other...

Page 30: ...trode A conductor driven vertically into the ground also known as an earthing bar Down lead The connection between the collector and the earth electrode system Metal masts with good conductivity may be used as down leads Ring leads Conductors usually buried in the ground connecting one or more down leads with one or more earth electrodes Often placed in the form of a closed circuit around a mast o...

Page 31: ...d distribute lightning strikes varies considerably between different places Consequently it may be difficult to provide earth electrodes where conductivity is low Inspection of installations Modifications to or around a building or mast fitted with lightning protection may impair the functioning of the protection system Such modifications may include for example sheet metal work window sills venti...

Page 32: ...must be created for one or the other or both metals to ensure that the distance through the soil in the electrical sense is more than two metres Connections or branches of the component of the installation above ground level should be carried out so that moisture cannot collect at the connection point This is particularly important if differing materials must be joined Attachment components must a...

Page 33: ...subject responsible if other Nr No KL ECS S LT Magnus Lindahl ECS S LT 96 5037 Dokansv Godk Doc respons Approved Kontr Checked Datum Date Rev File KI ECS S LTC 1996 06 04 A Error Unknown switch argument Suggestions for installation sites see figure 1 Figure 1 Suggestion for installation ...

Page 34: ...ent High voltage input See Figure 2 The lightning protection system must be linked to the incoming neutral lead of the electrical system A terminal or busbar for this purpose must be available in the fuse box This terminal must be marked Lightning conductor earth The terminal must be so placed in the electrical system that the functioning of any earth leakage trip circuit breaker is not affected F...

Page 35: ...Error Unknown switch argument Low voltage input See Figure 3 Incoming low voltage inputs usually telephone lines must if not an earth cable be protected by lightning protection RR 192500 This is a surge and transient protection Assembly must be such that there is no obvious fire hazard The earth connection must be to the earth electrode system or common earth terminal The connecting leads must be ...

Page 36: ...X Red Lights when the transmitter is on SQ Yellow Lights when the carrier is received See fig 1 There is also a 16 positions channel switch that can be operated by a small screw driver The 16 positions are marked 0 1 2 3 4 5 6 7 8 9 A B C D E F The channel number is selected by setting the switch to any position between 1 and F In systems where the line panel is controlling the channel setting the...

Page 37: ...ack HE 500011 0001 Swedish version Line unit ROA 119 7534 2 Only 4 wire Fan BKV 301 203 For SXK 107 2274 1 2 and 4 Accessories Bracket for wall mounting SXA 105 9585 2 per F800 Lightning protection kit RR 192500 2 per 4 wire line OEM kit NTM 201 1010 MRS 5000 kit NTM 201 1009 Incl Line unit and cables 255 Channel kit NTM 201 1020 Incl OEM kit Duplex kit NTZ 112 65 Filter plate cables and connector...

Page 38: ... ROA 119 3004 450 MHz low Duplex ROA 119 3030 450 MHz low Duplex ROA 119 3030 2 Link LD2 450 MHz mid Simplex ROA 119 8734 450 MHz mid Duplex ROA 119 3031 450 MHz high Simplex ROA 119 7553 450 MHz high Duplex ROA 119 7541 Power modules 80 MHz Simplex Duplex XTE519003 0101 160 MHz Simplex Duplex XTE519002 0101 450 MHz low Simplex Duplex RYT 901 6024 1 incl link LD2 450 MHz mid Simplex Duplex TE 5190...

Page 39: ...odk Doc respons Approved Kontr Checked Datum Date Rev File KI ECS S LTC Fel Okänt Fel F800 Personality Programming Contents F800 PERSONALITY PROGRAMMING 1 CONTENTS 1 INTRODUCTION 2 WHAT DO I NEED 2 HOW TO INSTALL THE SOFTWARE 3 ELECTRICAL CONNECTIONS 4 HOW TO SET UP YOUR PROM PROGRAMMER EQUIPMENT 4 WHAT CAN BE PROGRAMMED 4 HOW TO USE THE PROGRAM 5 Fel Okänt växelargument ...

Page 40: ... program the F800 radio you will need the following IBM compatible PC with one serial port The F800 personality programming software A printer optional PROM programmer equipment Cable between PC and programming equipment A Xicor 28C64 EEPROM IBM Compatible PC Printer optional F800 Personality Programming Software Cable PROM programmer equipment You will probably be able to use any PC to do this wo...

Page 41: ... setting permanent edit your AUTOEXEC BAT file to include the MODE command See your DOS manual for how to use the MODE command Change directory with the CD command to the ERICSSON FAST directory Start the program by typing the program name and press enter Example CD ERICSSON FAST Enter F800 Enter The program will now start From the main menu choose SET UP Make any settings of programmer equipment ...

Page 42: ... Set the prom programmer equipment to the preferred speed and file format Usually it is 9600 baud no parity 1 stop bit The recommended file format is Motorola S record Set the programmer to receive a file from the PC See the user manual for your prom programmer equipment on how to do this setting What can be programmed The F800 can be programmed with some basic radio data Frequency band depending ...

Page 43: ...le name and a comment that will be saved together with the file Your file is now saved for later use You can at any time retrieve your file for editing or printing When your file is saved the program will automatically return to the main menu From the main menu you can select Printing to print the result of the programming on any printer connected to the PC To make the prom choose Make prom from t...

Page 44: ...des access to audio signals and enables channel selection PTT etc The test unit is powered from the transceiver unit and a LED 12V indicates power on With sliding switches located at the handset s upper edge allows enabling or disabling of the built in microphone and earphone The handset has a PTT switch on the lower edge that is used when talking into the handset The modulation signal is connecte...

Page 45: ... line panel is programmed to select channel it should be removed The transmitter is keyed either by the built in PTT switch on the unit s side or by the switch labelled PTT on the front The sliding switches on the unit s upper edge is used to select either internal signal sources microphone and earphone or external signal sources line connectors Test Test Rx line Tx line Figure 2 Part of test hand...

Page 46: ...t s RX line out and set up the radio test set for AF measurements AF voltmeter Select CCITT or Psofometric filter 3 Apply a RF signal from the radio test set to the antenna input of the F800 Use antenna jack for simplex stations and stations with built in duplex filter use the RX jack for duplex stations with external filters 4 Set the RF generator s frequency to the channel frequency and set the ...

Page 47: ...TX output power and modulation with the radio test set 7 Switch of the transmitter 8 Set up the radio test set for signal to noise measurements 9 Start the transmitter and measure the S N ratio 7 LPC 102 213 AS SERVICE HANDSET The test unit can be used as a service handset when connected to F800 This enables the service engineer to monitor ongoing traffic and key and modulate the transmitter 1 Set...

Page 48: ...requires a minimum of tools and instruments The list below serves as a recommendation only Type Model Comment Radio test set Marconi 2945 or equivalent Wattmeter Bird 43 or equivalent Test hand set Ericsson LPC 102 213 Voltmeter Fluke 77 or equivalent RF cable RG224 or equivalent Connections to F800 require N male connector Test leads Connections to the test hand set require 3 5 mm plugs Torx scre...

Page 49: ...he 0 position To set the channel manually i e with the rotary switch it requires that the line panel is either removed or programmed not to select channel 3 2 NO OUTPUT POWER Step Check Likely fault s 1 Check that the green led indicating 12VDC on the interconnection board is lit 1 Power supply 2 Transceiver unit 2 Connect the test handset and check that the line panel selects a valid channel numb...

Page 50: ...nnection board 2 Check audio level on the incoming line Refer to service manual for line panel used No or low line level 1 Line problem Normal line level 1 Line panel 2 Interconnection board 3 4 NO OR LOW AUDIO SIGNAL FROM STATION Step Check Likely fault s 1 Connect the test handset to the transceiver unit and connect the RF test set to the station s antenna output Set up the test set for receiver...

Page 51: ...ity SINAD Low sensitivity 1 Transceiver unit 2 Internal RF cabling 3 Built in filters if any Normal sensitivity 1 Line panel 2 Interconnection board 3 6 NO COMMUNICATION WITH REMOTE CONTROLLER RADIO EXCHANGE Step Check Likely fault s 1 Check that the green led indicating 12VDC on the interconnection board is lit 1 Power supply 2 Transceiver unit 2 Check status indications on the line panel Refer t...

Page 52: ... KTR M Andersson 1997 12 07 A 97 2486 FAULT TRACING F800 doc 3 8 FAN TEST The fan is controlled by the transceiver unit and operating only when the station is keyed If the fan does not start when the station is keyed check that the transceiver unit supplies 12V on P7 1 on the interconnection board If 12V is present replace the fan If the transceiver does not provide 12V on P7 1 it is faulty ...

Page 53: ...L ECS S LT Magnus Lindahl ECS S LT 96 5045 Dokansv Godk Doc respons Approved Kontr Checked Datum Date Rev File KI ECS S LTC 1996 06 06 A Error Unknown switch argument SPECIAL SERVICE TOOLS FOR F800 Contents General 2 Instruction for service unit LPC 102 81 2 Channel table 3 Appendix Assembly drawing service unit LPC 102 81 ...

Page 54: ... Connection The 9 pin male connector on the cable will be connected into the front connector of the F800 radio unit SWITCHES S1 S4 CH1 CH8 Binary code for channel selection 0 15 See the channel table SWITCH S5 PTT PTT control ON OFF Parallel function with PTT switch in the service handset INDICATORS 12V LED for 12V DC from radio unit CH1 CH8 LED for channel binary code PTT LED for PTT function fro...

Page 55: ... KI ECS S LTC 1996 06 06 A Error Unknown switch argument Channel table Switch LED CH8 CH4 CH2 CH1 Channel 0 0 0 0 0 0 0 0 1 1 0 0 1 0 2 0 0 1 1 3 0 1 0 0 4 0 1 0 1 5 0 1 1 0 6 0 1 1 1 7 1 0 0 0 8 1 0 0 1 9 1 0 1 0 10 1 0 1 1 11 1 1 0 0 12 1 1 0 1 13 1 1 1 0 14 1 1 1 1 15 Channel 0 is not used in regular operation It has the same status as when the test equipment is disconnected 0 LED off high sign...

Page 56: ...n replaced with a new product The new cabinet is a universal cabinet that replace the old ones completely The old ones can not be ordered any more The new cabinet have the following features Same cabinet for all different F800 models New back plane board added Different slots for line panels MRS3000 and MRS5000 LED indicators for 12V squelch and TX Internal channel switch for 15 channels Integrate...

Page 57: ...son F800 004 E 1 Error Unknown switch argument KL ECS S XT Error Unknown switch argument 100W Power Amplifier The power stage transistor for the 100W power amplifier RS214 144 174 Mhz has been unavailable fore a long time Now it is in stock again it can be ordered from our spare parts department in Kumla Part number MRF245 The power amplifier itself however is not in our product range any more ...

Page 58: ...h argument Service Tool for F800 The old service tool LPC 102 81 for F800 have been replaced by a new product The new service tool have the following features Channel switch for 15 channels PTT switch LED indicators for channel PTT and 12V Switchable connections for AF signals RX line and TX line Integrated hand set for speech old handset not needed Connects directly to F800 9 pole front connector...

Page 59: ...re kontakt positionen skall linjepanel för MRS3000 placeras bild 1 och i den undre placeras linjepanel för MRS5000 bild 2 kortstyrskenorna flyttas då till de nedre hålen i plåten VARNING I F850 så kan fel placering av linjepanel orsaka skador både på linjepanel och på stationsenhet Mounting of line panel MRS3000 MRS5000 for base station F800 F850 Mounting of line panel should be done as following ...

Page 61: ...yla radion vid sändning luftriktningen från fläkten skall vara så att den blåser på stationen Vid vår ankomstkontroll har vi uppmärksammat en felaktigt monterad fläkt i basstationslådan se nedan bilder för fläkten Vid felaktig monterad fläkt skruva bort bakstycket på lådan varpå 4 stycken skruvar för fläkten blir åtkomliga vänd fläkten åt rätt håll Felaktigt monterad fläkt produktskylten syns ej R...

Page 62: ...ect to support this product family 7 years after products discontinue is now fulfilled This means that all support for those products will come to an end From December 31 2005 no support central repair documentation or training will be available Most spare parts are no longer available There are three exceptions to this Programming can still be ordered from Kumla Some selected spare parts may stil...

Page 63: ...NICAL SOLUTION Product structure diagram 1315 KRD 103 1OUx new revision _6 replaces old revision A 1 New standard Cabinet SXK 107 2274 4 will in new production replace old versions SXK 107 2274 1 MRS2000 MRS3000 SXK 107 2274 2 MRSSOOO and SXK 107 2274 3 OEM 2 New Krt NTM 201 1009 KIT F800 MRS5000 is added 3 New Kit NTM 201 1010 KIT F800 OEM is added 4 Old Kit SXK 107 2277 KIT LINK F800 is removed ...

Page 64: ...Y I I I IB I B l I I r I I SVART BLACK i I i I i I i r I i 0 r J I I t I I c 0 I I 0 I I 0 J Ln t GRA GREY Ln i J SVART BLACK D l i I l ERICSSON Referenser References Datum Dare i Rev CAO UNlGRAPHlCS 11 1993 02 08 B F F IBlad Sl Hr ...

Page 65: ...J Fakta11nt 1arig Subiect rwponsib Nr No K I ECS EU TR PM CP TMP BL 15188 RPM 113 670 Datum Dar Rev Fiie 90 07 19 A Beniimning Titla KABEL CABLE Toleranser Tolaranctn Ritningsr91Jler Orawing ruin Ref R Snitt Section A A 1 Br Br 3 Gn Gn 0 0 lO C i 2 Bl Bl 4 Or Or Or Or Gn Gn Br Br lled Sh f 1 f Ux ...

Page 66: ...13 MRSSOOO B B c c D D E E ERICSSON i5 so subject responsib e if olher Referenser Relerences Datum Date Rev Kl ECS YffF 940321 A F Prodli tbenämning Prod F Dokumentnr Oocumenl No Blad Sheet 193 12 SXK 107 2274 4 Uen 1 1 ...

Page 67: ...F 1 ERICSSON i Refenlnser R r I I I jNTM 2011009 I L RS_50Q_ 2 3 4 A B c D E Uppgjord twn falclunsvalig om annan Prepeted alao ubject ponsible il olher Kl ECS S XU S Lindblad R 950511 B F CABLE TERMINAL INFO F800 ...

Page 68: ... VIT WHITE 4 B 5 BRUN BROWN s c c J2 1 0 J1 0 D 0 D 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 E E 13cml 1 3 1 ERICSSON Referenser References Datum 0 le Kl ECS Y rF 940324 A F ProdlJctbenlrnning P F FÖRBINDNINGSKABEL C NNECTION CABLE Ookumentnr Document No Blad Sheel ...

Page 69: ...J2 1 BLAIBLUE 5 2 GUL YELLOW 3 3 RÖQ IREO 2 8 4 VIT NHITE 7 8 5 BRUN BROWN 8 _ j c c 1 J2 J1 0 J 0 D i 0 D 0 0 r3cml r3cml E E ERICSSON i Kl ECS S XU S Lindblad Referenser Relrlrent ell Oatum 0 le Rev 950511 B F F ...

Page 70: ...VIT YELLOW WHITE 7 I 8 RÖD VIT RED WHITE a 9 ORANGE VIT ORANGE WHITE 9 10 SVART BLACK 10 r 11 11 GRÖN GREEN r 12 12 SVART VIT BLACK WHITE r 13 GRÖN VIT GREEN WHITE 1 c 14 BLÅ VIT BLUE WHITE 14 c 15 151 RÖD RED I J1 J2 D D r E E ERICSSON i5 Referenser Referenc n Datum 0 te Rev 940324 A F F NECTION CABLE DokumentJY Docum No Blad Sheet ...

Page 71: ...RANGE WHITE SVART BLACK GRÖN GREEN SVART VIT BLACK WHITE GRÖN VIT GREEN WHITE BLÅ VIT BLUE WHITE RÖD RED 1 ___L __ _____ 4 ____ J2 1 2 3 4 5 s 7 8 9 10 r 11 r 12 r 13 r 14 r 15 r J2 0 0 0 0 0 0 0 0 0 0 0 0 l 1 Uppgjord _ fa ktaa ns_va_n g_om_a_n_nan_ _ prepärtid aliö3 ub_ jec_l_l9S_pÖili bied ot1 _ _ _ _ __ R eE e ii 3_ S Lindblad öii m o Rev Kl ECS S XUC 950511 B F Ptoduktbentmning Product FÖRBIN...

Page 72: ...WHITE 3 BLÅ VIT LUE WHITE 4 RÖD VIT ED WHITE 5 BRUN BROWN RÖD RED KABLAR SOM INTE INKOPPLAS ISOLERAS MED KRYMPSLANG UNUSED WIRES TO BE INSULATED WITH SHRINK TUBING 1 Datum Dal Kl ECS Y fF 940324 Prcx hJrtbenlmning P name J2 0 0 FÖRBINDNINGS ONNECTION CABLE Dokumentrv Documenl No 0 0 A B c D E Rev A F Blad Sheel ...

Page 73: ...2 3 4 A A J1 FAN 1 2 B 3 B c c 1 0 J1 D RÖD RED D SVART BLACK 0 E E ERICSSON subjed responsible lf olherj Referense References Datum Dste Rev 931102 A F F Dol umeotnr Oocument No Blad Sheet _ __ 11 ...

Page 74: ...E 4r B 2 GULJYELLOW 3 B 3 RÖD RED 5 4 VIT WHITE 2 _ c c D J1 D J2 0 6 0 0 5 0 0 4 0 0 3 0 0 2 0 C cc 13cml 13cml E E ERICSSON Referenser References Datum Date Rev 940318 A F F ONNECTION CABLE Dokument nr Docume No Blad Sheet ...

Page 75: ...08 25 E CMF2811H leNimni TitM FB08 F80S MRS 281 JllJ 3 1 JllJ MRS 2888 30 1le Ref TRANSCEIVER LINE PANEL OPT ONS LINES J1A J19 J3 J2 12V ro bl vi CH 1 gr vi TX DATA RX IIATA sv vi FAN CONTROL r 0 SJ or vi ev si LB TX LINE r 0 CH 2 bl 4i LO r CH 4 TX I FUKT FAN PTT v 2KLA RX LINE bl gl 3 LC CH 8 vi I sv J 481 Pl e or bl 11 l2V gn br 2 1 8V I I lildkon 9 RIP Od ...

Page 76: ...H 8 J4 1 T I or bl vi faktaanw Subi t _ FORBINDNINGSSCHEMA WIRINC DIAGRAM Nr No Sh f 1 l CP TU T C 10731 SXK 107 2274 2 Ux Datum 0 92 0311 D TitM F800 MRS 5000 LINE PANEL OPTIONS LINE UNIT LIJ J1A J19 J3 Jl 0 t ro sv JS LARM 1 LARM 1 LARM 2 LARM 2 bl vi LARM J LARM J rö vi LARM 4 ll LARM 4 91 vi 3 I OI bl 3n br file GMF2812H Ref LINES J2 bl ro gl vi I FLAKT FAN Pl 11 l2V 21 fJV I ...

Page 77: ..._va i I 12V A26j A7 t AX I A151 I JP3 I I I l 4 l A16l l TX A18 I A12t i TXU A191 I A111 I AXD 31 l A20l RTS 4 l A13 1 I CTS 5 I 813 t I t I 819 1818 Ie12 T A25i STYR IN 2 I I A24tSTYR IN 1 I I A27 STYR UT 2 I I I I I 817 LARM 1 I 816 LARM 1 t814 LARM 2 f815 LARM 2 1813 LARM 3 I 812 LARM 3 1 i 2l 31 T 41 1 I I I 41 I I 5 Je10 LARM 4 1 A26lSTYR UT 1 1811 LARM 4 3 t A9 RSSI in 10 I I JP1 JP3 FOR LIN...

Page 78: ...ON Uppgjord Prepared Benämning KRETSKORT Shfft Rev ff m v JcM J Lindblad Il i d B2 I 88 0 1lE 0 0 Komponentplacering 1 1 Nr No 1078 ROA 117 201 OUx Datum Date Rev Fie 940325 A Tltl PRINTED BOARD 9d Il D Ulc 8 ...

Page 79: ...AWING 8 1 rrl 1 2 0 15188 NTM 201 57 UX Datum ar 90 1 14 STATION UNIT ClOO U1 Radiokort Radio board U2 CPU kort CPU board UJ Kommunikationskort Communication board Standardkodning KO med 1 s is Standard coding KO with Pos 15 other coding aeeording to 1518 Låst med låslaek tillposl Loeked with lae to pos 1 15188 NTM 201 57U ...

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Page 83: ...I ECS S LTC 1996 06 06 A 965044 DOC F800 Circuit description CONTENTS INTRODUCTION 2 Radio unit 2 Line interface 3 Programming 3 Options 3 RADIO BOARD 4 Frequency generator 6 Transmitter 10 Antenna switch 13 Receiver 14 DC power supply 17 PROCESSOR BOARD 19 Processor And Peripheral Circuits 19 Incoming Speech 20 Outgoing Speech 21 Modulation Circuits 23 Tunning Of Front End 23 Channel Selection 23...

Page 84: ...red F800 is powered with external 12V DC via a 2 pole connector found on the rear of the cabinet Line and RF connectors are also found on the rear of the cabinet In addition to the mentioned connectors there are connectors for transmitter synchronisation and alarms located at the rear In OEM version there is an OEM connector also found at the rear Application examples are described in document ECS...

Page 85: ...used depends on frequency band and operational mode Line interface In the cabinet there are two slots for standard Euro size boards with 64 pin connectors The upper slot is used for LP100 LP200 and LP210 MRS3000 The lower slot is used for RC 5 and LP3 MRS5000 The line interfaces are described separately Programming All customer specific parameter such as frequencies etc are stored in a EEPROM in t...

Page 86: ...r generation of transmitter carrier All modulation is done in the frequency generator There are two modulation signals used mod FM and mod PM Receiver Converts RF signals to AF signals The receiver is a double super het erodyne type The receiver DATA and SPEECH signals are connected to the CPU board A SQUELCH signal as well as a RSSI signal is obtained from the 2nd IF in the receiver These two sig...

Page 87: ...ower Ind 5V 10VR 10VT 12V 12V Power Red To CPU board External connector RF tunning Fig A Block diagram radio board simplex version The radio board is a multilayer printed circuit board and the majority of the components are surface mounted on the PCB To obtain proper grounding and the required screening the board is attached to the F800 chassis by nine screws The radio board is exchanged as one un...

Page 88: ...smitter carrier In duplex versions one frequency generator is used for local oscillator and one frequency generator is used to produce the transmitter carrier The following circuits are the major parts of the frequency generator used in simplex versions VCO Voltage Controlled Oscillator PLL synthesiser circuit Prescaler Loop filter Crystal reference oscillator Buffer stage Output amplifiers PLL 9 ...

Page 89: ...er frequency the signals must be divided down to a common frequency The PLL circuit has three internal programmable divider stages one for the reference signal and two for the VCO signal The denominators i e the contents of the divider stages are loaded into the PLL circuit by data from the CPU board According to the loaded denominators the PLL circuit will activate a signal for control of the ext...

Page 90: ...ut of PC2 is in a high impedance state Both of these two signals are connected to the loop filter Internal control logic Divider Divider 2 stages Mod Phase Comparator Phase Comparator 12 5 kHz 9 MHz 152 6 167 4 MHz Data Strobe Address From reference osc A2 A1 A0 From VCO LOOP Filter DC voltage to VCO Selector for prescaler D3 D2 D1 D0 Modulation Phase Fig C Principal diagram for PLL circuit and lo...

Page 91: ...istor switches controlled by the CPU board The two transistor switches are used in combination and thus four sub bands are created The VCO also has a modulation input used for frequency modulation The modulation signal is amplified and filtered before it is connected to the resonance circuit in the VCO The modulation is done by changing the capacitance in resonance circuit by one capacitance diode...

Page 92: ... implemented on the radio board The following RF circuits and control blocks are parts of the transmitter RF switch TX RF on off switching RF driver Preamplification of the RF signal RF power amplifier Final RF amplifier Directional coupler Detection of SWR RF detector Detects RF power output power RF power indicator Indicates that RF output power is present Power control loop Monitoring the RF ou...

Page 93: ...grated module with two internal amplifier stages The amplification in the final stages is set to fixed ratio in dB To obtain maximal output power both stages in the RF module are supplied with 12 V directly from the DC source Internally in the module there are filters to avoid oscillation etc The output from the final stage is passed through an LP filter before it is passed on to the directional c...

Page 94: ...high and thus the output power is also reduced The output from the comparator in the power control loop is connected to a buffer stage The buffer stage acts as a variable resistor and changes the DC supply voltage to the transistor in the RF driver The desired RF output is set in two levels low 2 W and high 20 W With a logical control signal power red the CPU board can select either high or low ou...

Page 95: ...ed LC filter with one capacitance diode and one pin diode In the TX path there is a pin diode acting as a switch As soon as the transmitter is activated the transistor starts feeding a current through the diodes and thus the TX RF path is opened and the impedance of the filter on the RX input is changed To protect the RX front end the tunnel diode is also connected to the front end input to ground...

Page 96: ...ep with a specific DC level connected to the capacitance diodes Each tuning step will give the front end filters a band width of 3 2 MHz In fact the 16 different tuning steps are not equal in size the most narrow is approximately 1 7 MHz and the step with the highest band width is approximately 3 7 MHz The gain in the front end is approximately 10 15 dB and the output is also limited RF In RF Tuni...

Page 97: ...circuit 2nd IF and demodulator The 2nd IF is implemented in two integrated circuits with the following functions 2nd local oscillator 2nd mixer 2nd IF amplifier RX limiter Demodulator Signal strength indicator There are a small number of external components in the 2nd IF The major external components are the detector coil the 2nd LO crystal and a 455 kHz crystal filter All major IF functions are f...

Page 98: ...finally a comparator The high pass filter designed to allow frequencies higher then 8 kHz to pass After the HP filter there is a noise amplifier followed by a limiter The limited AF signal is rectified and then connected to one of the inputs of the comparator The other comparator input is connected to a reference value The comparator output as in high state when there is noise present at the input...

Page 99: ...er amplifier 12V is present as long as the radio unit is connected to the DC power source 12VSW Switched 12V from a transistor switch controlled by the on signal from the CPU board The voltage is fused by a 4 A fuse 10V Switched 10V delivered from a regulator on the radio board The voltage is used in the frequency generator The regulator is supplied with 12VSW 10VR Switched 10V delivered from a re...

Page 100: ... LT 96 5044 Dokansv Godk Doc respons Approved Kontr Checked Datum Date Rev File KI ECS S LTC 1996 06 06 A 965044 DOC EMI Filter 10V 10VR 10VT 5V TX On 4A ON CPU board 10A To frequency generator To receiver and RX synt To transmitter and TX synt To PLL circuit in frequency generator To RF power amplifier To CPU board Fig L DC power supply radio board ...

Page 101: ...s for speech AF circuits for tone signalling I O circuits for communication with external units I O circuits for internal communication Interface for the radio board Interface for option board DC power supply and distribution The CPU board is fitted with two external D type and five internal strip connectors The majority of the components are surface mounted to the multi layer PCB The processor an...

Page 102: ... together form the 16 bit address bus The information on the latch output will remain until a new strobe signal has been generated by the processor The memory 1 Mbytes is located on the processor board Three different kinds of memory circuits are used The software for the F800 is stored in an EPROM Z2 the customer specific information is stored in an EEPROM Z4 and temporary information is stored i...

Page 103: ...ine interface TX Line Mic Z22A Z21D TX Data Z22B Limiter Z22C Z22D From outport Z26B To mod circuits Fig N Block diagram TX AF An audio signal from the line interface is connected to an amplifier stage Z22A via P405 8 The amplifier is followed by a pre emphasis net C8 R67 The pre emphasis net is followed by a limiter Z22B The Z22B limits the amplitude to 3 5VPP The limiter is followed by an LP fil...

Page 104: ... to different modulation sensitivity in the transmitter a mixture of FM and PHASE modulation has to be used The proportions between FM and PHASE modulation depends on which frequency the transmitter is active on The proportions are controlled by the processor via outports Z13 and Z14 The processor sets the switches in Z25 according to the operational frequency From the modulation sensitivity block...

Page 105: ...r board The resistance is controlled in 16 steps from the processor via an outport The voltage divider is formed by the switches in Z24 and R57 R61 From outport 12V Radio board FIG P Block diagram tuning of RF front end Channel selection A channel is chosen by loading channel information into the PLL circuit in the synthesiser on the radio board The channel information consists of a PLL address a ...

Page 106: ...d This voltage is always present as long as the F800 is connected to external DC The voltage is used as DC source for the 5 VB regulator Z27 The 5VB provides voltage to the line interface via P405 13 12V 5VB 5V Reset Z28 Z27 12V U 5V U 5V FIG Q Internal DC circuits The 12V is also connected to regulator Z28 which provides 5V to internal circuits The regulator includes a power on reset The reset li...

Page 107: ...S LTC 1996 06 06 A 965044 DOC Connectors The CPU board has two external connectors and five internal connectors P401 9 PIN D type on the front of the F800 J402 16 PIN strip connector frequency generator J403 16 PIN strip connector transmitter J404 8 PIN strip connector receiver P405 15 PIN D type on the back of the F800 radio unit J406 25 PIN strip for option board J407 15 PIN strip for option boa...

Page 108: ...tch argument Dokansv Godk Doc respons Approved Kontr Checked Datum Date Rev File KI ECS S LTC Error U k Error U k Error Unknown switch argument F800 as Radio Link Contents CONTENTS 1 OVERVIEW 2 CONFIGURATION 2 ELECTRICAL INTERFACE 2 PHYSICAL INTERFACE 2 APPLICATIONS 2 EXAMPLES 3 FIGURE 1 F800 LINK PATH BASIC STRUCTURE 3 FIGURE 2 F800 LINK PATH FOR ERICSSON MRS5000 3 ...

Page 109: ...t Nominal AF levels are 10 dBm The output level is fixed to 10 dBm and the input gain can be adjusted to handle between 10 dBm and 30 dBm line level If required the board could be reconfigured by jumpers to act as a hybrid to make a two wire interface The part number for the LIJ board is ROA 119 7534 Physical interface The four wire line is connected to a modular connector on the rear of F800 mark...

Page 110: ...k 4 wire line 4 wire line Directional antenna Directional antenna Site no 1 Site no 2 Figure 1 F800 link path Basic structure TC549 TX RX LIJ Duplexer TX RX LIJ Duplexer TX RX LP3 Duplexer Link path F800 Link F800 Link F800 Base RAC3 4 wire line 4 wire line Omnidirectional antenna Directional antenna Directional antenna Central site Remote site LIJ LIJ Figure 2 F800 link path for Ericsson MRS5000 ...

Page 111: ...v Godk Doc respons Approved Kontr Checked Datum Date Rev File KI ECS S LTC 21 05 1996 07 32 00 B F800 as Repeater Contents CONTENTS 1 ABOUT REPEATERS 2 TECHNICAL SPECIFICATIONS 2 STAND ALONE REPEATERS 3 CARRIER CONTROLLED REPEATER 3 BACK TO BACK REPEATER 4 TONE REGENERATING REPEATER 5 TONE TRANSPARENT REPEATER 6 CONNECTED REPEATERS 7 MRS3000 7 MRS5000 8 ...

Page 112: ...aters connected to control systems such as MRS3000 or MRS5000 are used to work as combined bas and repeater stations A stand alone repeater is a repeater that has no wire or link connection to a radio exchange or a control unit However it could exist as a component in such a network Technical specifications The F800 repeater has 20 W output on all frequency bands It contains a duplex filter to be ...

Page 113: ...retransmision of the received signal as soon as the receiver detects a carrier on the receiving frequency The transmitter will continue to transmit as long as the carrier is present After the carrier has gone the transmitter will continue to transmit a predifined hang time usally 10 seconds This parameter could be set in the F800 personality programming The F800 needs no line panel for this applic...

Page 114: ...y two carrier controlled repeaters connected together with a special back to back cable The back to back repeater makes it possible to carry out full duplex conversation It can be used for different purposes converting from one frequency band to another to extend repeater coverage to remote areas or just as a full duplex repeater between mobile duplex stations Note that this configuration involves...

Page 115: ...ed and only one repeater exists on each frequency The function of the LP3 is to analyse the incoming tone calls to determine if it is a call to another mobile station The repeater will start the transmitter when a complete tone call is received and regenerate the tone call The LP3 will also control the maximum talk time absence of carrier and also receive disconnection tone from mobile subscribers...

Page 116: ...bile subscriber can choose which repeater to use by sending a repeater start code which consists of two extra tones preceding the normal tone call After receiving the repeater start code the repeater will be transparent to all succeeding tones Because this repeater does not regenerate tones it will be transparent for all system functions in MRS5000 This repeater controls absence of carrier wave bu...

Page 117: ...epeaters MRS3000 RX F1 TX F2 DUPLEXER TX F1 RX F2 TX F1 RX F2 Line panel LP210 Control unit CU210 Fig 5 Base repeater in MRS3000 system This tone regenerating repeater works as a combined base and repeater station in a MRS3000 semi duplex network It is connected with 4 wire cable to a control unit CU210 See separate system description ...

Page 118: ...2 DUPLEXER TX F1 RX F2 TX F1 RX F2 Line panel LP3 Radio exchange TC549 Fig 5 Base repeater in MRS5000 system This tone regenerating repeater works as a combined base and repeater station in a MRS5000 semi duplex and full duplex networks It is connected with 4 wire cable or radio link to a radio exchange TC549 See separate system description ...

Page 119: ... other Nr No Error Unknown switch argument Error Unknown switch argument Dokansv Godk Doc respons Approved Kontr Checked Datum Date Rev File KI ECS S LTC Error U k Error U k Error Unknown switch argument F800 as OEM base station Contents CONTENTS 1 OVERVIEW 2 CONFIGURATION 2 OPTIONS 2 CONNECTOR DISPOSITION 3 ...

Page 120: ...des the standard F800 simplex or duplex the OEM model should be equipped with the OEM cable kit which includes the OEM connector Options To extend the functions of F800 OEM the following options can be added MRS5000 cable kit which will give the F800 a 600 ohms floating input and output 4 wire line interface The ordinary modular RJ 6 4 connector is used for this 255 channel kit which will give the...

Page 121: ...dBm Data output from receiver 6 12V 12V 12 VDC output max 1000mA 7 SQ 12V Squelsh open collector 8 5V ext 5V 5V DC output max 1000 mA 9 TX line 10dBm AF input to transmitter 10 RX line 10dBm AF output from receiver 11 CH 1 12V 0 active Binary channel select bit 1 12 CH 2 12V 0 active Binary channel select bit 2 13 CH 4 12V 0 active Binary channel select bit 4 14 CH 8 12V 0 active Binary channel se...

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Page 125: ...nan Prepared also subject responsible if other Nr No KI ECS S MP Sven Erik Wahl KI ECS S M 98 0957 Dokansv Godk Doc respons Approved Kontr Checked Datum Date Rev File KI ECS S MPC Johan Gentz 1998 11 13 A FUNCTIONAL DESCRIPTION Radio Base Station F800 ...

Page 126: ...okansv Godk Doc respons Approved Kontr Checked Datum Date Rev File KI ECS S MPC Johan Gentz 1998 11 13 A Contents Page 1 INTRODUCTION 3 2 OVERVIEW 3 2 1 Configuration 3 2 2 Operational frequency 4 3 RADIO UNIT 4 3 1 General 4 3 2 Radio board 4 3 3 Processor board 4 3 4 255 channel board 5 4 PROGRAMMING 5 5 RADIO CABINET 5 6 BASE STATION INTERFACE 6 ...

Page 127: ... duplex duplex or as a stand alone repeater station working in duplex mode It can be used either in the Ericsson well known mobile radio system MRS3000 or MRS5000 as well with systems from other manufacturers In addition to this the F800 can be used as a single channel radio link The F800 can also be used as a carrier controlled repeater without any line interface or other external logic The base ...

Page 128: ...connections between the radio unit and the cabinet are made through connectors at the rear of the radio unit and corresponding connectors in the cassette 3 2 RADIO BOARD The radio board contains the frequency generator transmitter and receiver In addition to this there are circuits for internal power supply The transmitter is frequency modulated and the receiver is of double super heterodyne type ...

Page 129: ...ssor based linepanels The data in the linepanel can also easily be changed 5 RADIO CABINET The base station is housed in a 19 cabinet intended for rack or wall mounting with special brackets The cabinet houses the radio unit a duplex filter and the line interface Each base repeater station is fitted with a fan that starts when the transmitter is keyed To enable easy removal for servicing the radio...

Page 130: ...S S MPC Johan Gentz 1998 11 13 A 6 BASE STATION INTERFACE The radio station normally includes a line interface for handling the functions of the radio and the communication with for example a centralized radio exchange The line interface is installed inside the cabinet in a slot for a standard Euro board with a 64 pin connector The type of line interface used varies depending in which application ...

Page 131: ...cifik kombi nation av moduler baserad på an vändarens önskemål Modulerna är monterade i en apparatlåda med gott om utrymme för OEM produkter t ex enheter för tonsignalering kryptering eller telemetri överföring av mätdata F800 kan användas för både simplex och duplextrafik på frek vensbanden 80 160 och 450 MHz Stabila frekvenser 255 kanaler Den radiofrekventa signalen genereras i F800 av en digita...

Page 132: ...entuellt avbrott på linjen mellan växeln och basstationen Enkanalig radiolänkterminal F800 kan mycket väl användas som radiolänkutrustning Två F800 stationer i vardera änden av en radio länkförbindelse ersätter då en 4 trådig abonnentlinje Automatisk kanalscanning F800 kan arbeta med automatisk kanalscanning på upp till 8 kanaler Det innebär att den kontinuerligt söker efter inkommande anrop genom...

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Ericsson Base Station F800, Field Service Manual

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