Fibre Optic Master and Remote Site User Handbook For R.F. Design & Integration, Inc. AFL Works Order AFL Product Part No. Q116270 60-212701 - 500 MHz F/O Master Site 60-212801 - 500 MHz F/O Remote Site Fibre Optic Master and Remote Site User Handbook Document Number: 60-212701HBK - Issue No.
Table of Contents 1. INTRODUCTION ............................................................................................................ 5 1.1. Scope and Purpose of Document ............................................................................. 5 1.2. Limitation of Liability Notice....................................................................................... 5 2. SAFETY CONSIDERATIONS......................................................................................... 6 2.1.
.2.4.13. 4.2.4.14. 4.2.4.15. 4.2.4.16. 4.2.4.17. 4.2.4.18. 4.2.4.19. 12V Relay Board (20-001601) ................................................................................. 35 24V Relay Board (20-001602) ................................................................................. 35 Fibre Optic Transmitter (2.7GHz) (20-005401) ........................................................ 36 Fibre Optic Receiver (2.7GHz) (20-005501) ............................................................
1. INTRODUCTION 1.1. Scope and Purpose of Document This handbook is for use solely with the equipment identified by the Aerial Facilities Limited (AFL) Part Number shown on the front cover. It is not to be used with any other equipment unless specifically authorised by AFL. This is a controlled release document and, as such, becomes a part of Aerial Facilities’ Total Quality Management System. Alterations and modification may therefore only be performed by AFL.
2. SAFETY CONSIDERATIONS 2.1. Earthing of Equipment Equipment supplied from the mains must be connected to grounded outlets and earthed in conformity with appropriate local, national and international electricity supply and safety regulations. 2.2.
2.5. Chemical Hazard Beryllium Oxide, also known as Beryllium Monoxide, or Thermalox™, is sometimes used in devices within equipment produced by Aerial Facilities Ltd. Beryllium oxide dust can be toxic if inhaled, leading to chronic respiratory problems. It is harmless if ingested or by contact. Products that contain beryllium are load terminations (dummy loads) and some power amplifiers. These products can be identified by a yellow and black “skull and crossbones” danger symbol (shown above).
3. MASTER SITE 60-212701 The Master Site Shelf is a 3U Rack mount shelf and provides two separate RF paths, uplink and downlink with provision to vary the gain of either path using a switched variable attenuator, one in each path.
3.2.
3.3. 60-212701 System Diagram Fibre Optic Master and Remote Site User Handbook Document Number: 60-212701HBK - Issue No.
3.4. 60-212701 Major Sub Components 3.4.1. UHF 3dB Splitter/Combiner (05-002603) The 3dB Splitter/Combiner (05-002603) is a device for accurately matching two RF signals to a single port or splitting an RF signal to two ports whilst maintaining an accurate 50 load to all inputs/outputs and ensuring that the VSWR and insertion losses are kept to a minimum.
3.4.3. Switched Attenuator 0-30dB 1W (10-000801) 10-000801 provides attenuation from 0 - 30dB in 2 dB steps, the attenuation is simply set using the four miniature toggle switches on the top of each unit. Each switch is clearly marked with the attenuation it provides, and the total attenuation in line is the sum of the values switched in. They are designed to maintain an accurate 50ȍ impedance over their operating frequency at both input and output.
Fibre Optic Transmitter (20-005401) ‘D’ Type Female Connector Pinouts Pin No. 1 2 3 4 5 6 7 8 9 3.4.5. Signal Description +10-12V DC Power 0V DC, Power Ground 0V DC, Power Ground No Connection No Connection TTL Alarm, (0V=good, open coll.= fail) Relay Alarm Contact (N.C) Relay Alarm Contact (Common) Relay Alarm Contact (N.O) Fibre Optic Receiver (2.7GHz) (20-005501) The receiver demodulates RF signals from the laser with a typical gain of 18dB and with 30dB adjustability in the RF domain.
Fibre Optic Receiver (20-005501) ‘D’ Type Female Connector Pinouts Pin No. 1 2 3 4 5 6 7 8 9 3.4.6. Signal Description +10-12V DC Power 0V DC, Power Ground 0V DC, Power Ground No Connection No Connection TTL Alarm, (0V=good, open coll.= fail) Relay Alarm Contact (N.C) Relay Alarm Contact (Common) Relay Alarm Contact (N.O) 12V Relay Assembly (80-008901) The General Purpose Relay Board allows the inversion of signals and the isolation of circuits.
3.4.7. PSU 50W (12V 5A) (96-300048) The power supply unit is a switched-mode type capable of supplying 12V DC at 5Amps continuously. No routine maintenance of the PSU is required. If a fault is suspected, then the output voltage from the power supply may be measured on its output terminals. This is typically set to 12.2V. The adjustment potentiometer will be found close to the DC output terminals. All the PSUs used in AFL Cell Enhancers are capable of operation from either 110 or 220V nominal AC supplies.
4. REMOTE SITE 60-212801 The Remote Site 60-212801 is composed of two rack mount chassis, one containing the filtering, and amplification modules along with the fibre optic transmitter and receiver (60-212802), the second tray is a 100 W amplifier (80-245101), part of the Downlink signal path. 60-212801 sub components section 4.1. 4.2. 4.1.
4.1.3.
Fibre Optic Master and Remote Site User Handbook Document Number: 60-212701HBK - Issue No. 1 464.50 14/09/2005 CB PL 14/09/2005 IB 21/06/05 MATERIAL : ALUMINIUM ALLOY CONNECTORS : SMA SOCKET 3 PIN PLUG (NC-X) 9 WAY 'D' TYPE PLUG EARTH STUD 101.50 EARTH STUD 436.80 1:4 PART No 80-245101 494.00 454.00 POWER ON B 482.
4.1.5. 80-245101 System Diagram Fibre Optic Master and Remote Site User Handbook Document Number: 60-212701HBK - Issue No.
4.1.6. 80-245101 Major Sub Components 4.1.6.1. 25W Linearised Amplifier Module (12-026902) Linearised Power Amplifier (12-026902) is a multi-stage, solid state power amplifier. Class A circuitry is employed throughout the device to ensure excellent linearity over a wide dynamic frequency range. All the semi-conductor devices are very conservatively rated to ensure low device junction temperatures and a long, trouble free working lifetime.
4.1.6.2. UHF 3dB Splitter/Combiner (05-002603) The 3dB Splitter/Combiner (05-002603) is a device for accurately matching two RF signals to a single port or splitting an RF signal to two ports whilst maintaining an accurate 50 load to all inputs/outputs and ensuring that the VSWR and insertion losses are kept to a minimum.
4.2. Remote Uplink/Downlink Shelf (60-212802) The Remote Uplink/Downlink Shelf is an 8U Rack mount shelf and provides two separate RF paths, uplink and downlink with provision to vary the gain of either path using a switched variable (0 to 30dB) attenuator, one in each path. Each path is also fitted with an Automatic Gain Control (AGC) circuit which consists of two units, a detector/amplifier and an attenuator. Normally the attenuators in the AGC circuit are at minimum attenuation.
4.2.2.
Remote Uplink/Downlink Tray (60-212802) rear view A B C D E F G H I J K L M N Uplink Fibre Optic output to Master site Uplink RF input from mobile antenna Downlink Fibre Optic input from Master site Downlink RF output to mobile antenna Uplink switched attenuator 10-000701 Downlink switched attenuator 10-000801 Alarm Output AC Trip switch AC Input (110V ) DC Fuse 12V DC Auxiliary Output Earth connection AC power cord DC, RF and Alarm interconnections for Amplifier 80-245101 Fibre Optic Master and Remote S
4.2.3. Remote Site 60-212801 System Diagram Fibre Optic Master and Remote Site User Handbook Document Number: 60-212701HBK - Issue No.
4.2.4. 60-212802 Major Sub Components 4.2.4.1. Bandpass Filter (02-010901) Bandpass Filter (02-010901) is a multi-section design with a bandwidth dependent upon the passband frequencies, (both tuned to customer requirements). The response shape is basically Chebyshev with a passband design ripple of 0.1dB. The filters are of helical & combline design respectively, and are carefully aligned during manufacture in order to optimise the insertion loss, VSWR and intermodulation characteristics of the unit.
4.2.4.3. Switched Attenuator 0-30dB 0.25W (10-000701) 10-000701 provides attenuation from 0 - 30dB in 2 dB steps The attenuation is simply set using the four miniature toggle switches on the top of each unit. Each switch is clearly marked with the attenuation it provides, and the total attenuation in line is the sum of the values switched in. They are designed to maintain an accurate 50ȍ impedance over their operating frequency at both input and output.
4.2.4.5. Low Noise Amplifier (11-007402) The 30dB gain low noise amplifier used is a double stage solid-state low-noise amplifier. Class A circuitry is used in the unit to ensure excellent linearity over a very wide dynamic range. The two active devices are very moderately rated to provide a long trouble-free working life. There are no adjustments on this amplifier, and in the unlikely event of failure then the entire amplifier should be replaced.
4.2.4.6. Low Power Amplifier (1W) (11-007901) This amplifier is dedicated to be a 1.0 W driver from 380 MHz to 470 MHz. It is a 2 stage amplifier where each stage is in balanced configuration. It demonstrates very high linearity and good input/output VSWR. There is a Current Fault Alarm Function, which indicates failure of each one of the RF transistors by various alarm output options.
4.2.4.7. Low Power Amplifier (1W) (12-021801) The low power amplifier used is a 1 stage balanced configuration, solid-state amplifier. Class A circuitry is used in the unit to ensure excellent linearity over a very wide dynamic range. The three active devices are very moderately rated to provide a long trouble-free working life. Its housing is an aluminium case (Iridite NCP finish) with SMA connectors for the RF input/output and a D-Type connector for the power supply and the Current Fault Alarm Function.
4.2.4.8. Low Power Amplifier (2W) (12-021802) The low power amplifier used is a 1 stage balanced configuration, solid-state amplifier. Class A circuitry is used in the unit to ensure excellent linearity over a very wide dynamic range. The three active devices are very moderately rated to provide a long trouble-free working life. Its housing is an aluminium case (Iridite NCP finish) with SMA connectors for the RF input/output and a D-Type connector for the power supply and the Current Fault Alarm Function.
4.2.4.9. DC-DC Converter 24V -12V (13-003011) The DC/DC converter fitted is an AFL assembled, high power PCB unit with an 8 amp at 12V output capability. The circuit is basically an O.E.M semiconductor regulator (one side of which has a heatsink mounting plate, usually bolted to the casing of a Cell Enhancer) and smoothing components built onto a printed circuit board with screw block terminations. In event of failure this unit should not be repaired, only replaced.
4.2.4.11. Downlink AGC Components AGC Detector /Amplifier (17-001117) AGC Attenuator (17-001201) The Remote Site Uplink/Downlink Tray (60-212802) Downlink path is fitted with an Automatic Gain Control (AGC) system. The AGC system consists of two units, a detector/amplifier (part No. 17001117) and an attenuator (part No. 17-001201). The detector/amplifier unit is inserted in the RF path on the output of the power amplifier, and the attenuator is situated in the RF before 1st stage of amplification.
4.2.4.12. Uplink AGC Components AGC Logarithmic Detector /Amplifier (17-001109) AGC Attenuator (17-001201) The Remote Site Uplink/Downlink Tray (60-212802) Uplink path is fitted with a wide dynamic range Automatic Gain Control (AGC) system. This is fitted in the Uplink path to avoid overloading the amplifiers (with the associated performance degradation) should a mobile be operated very close to the unit.
4.2.4.13. 12V Relay Board (20-001601) The General Purpose Relay Board allows the inversion of signals and the isolation of circuits. It is equipped with two dual pole change-over relays with completely isolated wiring, accessed via screw terminals. Both relays are provided with polarity protection diodes and diodes for suppressing the transients caused by "flywheel effect" which can destroy switching transistors or induce spikes on neighbouring circuits.
4.2.4.15. Fibre Optic Transmitter (2.7GHz) (20-005401) The transmitter modulates the RF signal on to a laser, which is then transmitted over a fibre optic cable to a receiver. The laser current is monitored and compensated for constant optical out put power against temperature variation and aging. Laser over-current alarm function is provided as LED output as well as open collect and voltage-free relay contacts on 9 way D-type connector.
4.2.4.16. Fibre Optic Receiver (2.7GHz) (20-005501) The receiver demodulates RF signals from the laser with a typical gain of 18dB and with 30dB adjustability in the RF domain. The received optical power is monitored for alarm function in case of fibre damage. 20-005501 Specification PARAMETER Frequency Range (RF path) Frequency Range (Data path) Available Link Gain (RF Path) Link Gain ( DATA Path) Gain Flatness (entire frequency range) 'Gain vs.
4.2.4.17. 12V Relay Assembly (80-008901) The General Purpose Relay Board allows the inversion of signals and the isolation of circuits. It is equipped with a single dual pole change-over relay RL1, with completely isolated wiring, accessed via a 15 way in-line connector. The relay is provided with polarity protection diodes and diodes for suppressing the transients caused by "flywheel effect" which can destroy switching transistors or induce spikes on neighbouring circuits.
5. INSTALLATION 5.1 General Remarks When this equipment is initially commissioned, please use the equipment set-up record sheet in Appendix B. This will help both the installation personnel and AFL should these figures be needed for future reference or diagnosis. The equipment racks must be located on a flat, level surface that is made from a material suitable for bearing the weight of the rack assembly.
5.5 Commissioning Once all connections are made the equipment is ready for commissioning. To commission the system the test equipment detailed in Section 6.2. will be required. Using the system diagrams and the end-to-end test specification (supplied with the equipment), the equipment should be tested to ensure correct operation. Typical RF levels that are not listed in the end-to-end specification, such as input levels to the fibre transmitters are detailed in the maintenance section of this manual.
5.7 Antenna Isolation Fibre Optic Master and Remote Site User Handbook Document Number: 60-212701HBK - Issue No.
6. MAINTENANCE 6.1. Fault Finding 6.1.1. Quick Fault Checklist All tunnel equipment is individually tested to specification prior to despatch. Failure of this type of equipment is not common. Experience has shown that a large number of fault conditions relating to tunnel installations result from simple causes often occurring as result of transportation, unpacking and installation.
6.1.3 Downlink Confirm that there is a signal at the expected frequency and strength from the base station. If this is not present then the fault may lay outside the system. To confirm this, inject a downlink frequency signal from a known source at the master site BTS input and check for output at the remote site feeder output. If a signal is not received at the output it will be necessary to follow the downlink path through the system to find a point at which the signal is lost.
6.1.9 Service Support Advice and assistance with maintaining and servicing this system are available by contacting Aerial Facilities Ltd., see section 2.7. NOTE Individual modules are not intended to be repaired on site and attempts at repair will invalidate active warranties. Company policy is that individual modules should be repaired by replacement. Aerial Facilities Ltd maintains a high level of stock of most modules which can usually be despatched at short notice to support this policy. 6.
6.3 Care of Modules 6.3.1 General Comments Many of the active modules contain semiconductor devices utilising MOS technology, which can be damaged by electrostatic discharge. Correct handling of such modules is mandatory to ensure their long-term reliability. To prevent damage to a module, it must be withdrawn/inserted with care. The module may have connectors on its underside, which might not be visible to the service operative. 6.3.
When the heatsink has been removed, the amplifier may be unscrewed from the main casing by its four corner fixings and gently withdrawn. Fitting a new power amplifier module will be the exact reverse of the above. Note: Do not forget to apply fresh heatsink compound to the heatsink/main case joint and also between the amplifier and the main case. 6.3.5 Low Power Amplifier Replacement Disconnect the mains power supply and disconnect the 24V dc supply connector for the LPA.
APPENDIX A A.1. Glossary of Terms used in this document Repeater or Cell Enhancer Band Selective Repeater Channel Selective Repeater AC AGC BBU BTS CEMS C/NR DC Downlink (D/L) FO GND ID LED LNA LPA MOU M.S. MTBF N/A N/C OFR OIP3 P1dB PA RF RSA RX S/N TX Uplink (U/L) VSWR WDM A Radio Frequency (RF) amplifier which can simultaneously amplify and re-broadcast Mobile Station (MS) and Base Transceiver Station (BTS) signals.
Fibre Optic Master and Remote Site User Handbook Document Number: 60-212701HBK - Issue No. 1 F E D C B A GD APPD 10/05/00 DATE RF 1 ALL DIMENSIONS ARE IN mm UNLESS OTHERWISE STATED MB CHKD PL DRAWN RF FREQUENCY PROGRAMMING DATA B/W=30 to 200kHz BTS 2 HI IN LOW OUT R.S.
Fibre Optic Master and Remote Site User Handbook Document Number: 60-212701HBK - Issue No.
