RPM1

RPM1 RADIOMETRIX | Alldatasheet

Document overview

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Technical content

Features

Addressable pointAddressable pointAddressable pointAddressable point----totototo----point point point point PointPointPointPoint----totototo----Multipoint and broadcast modesMultipoint and broadcast modesMultipoint and broadcast modesMultipoint and broadcast modes Inverted RS232 interface at 5V or 3.3VCMOS levelInverted RS232 interface at 5V or 3.3VCMOS levelInverted RS232 interface at 5V or 3.3VCMOS levelInverted RS232 interface at 5V or 3.3VCMOS level DTE speed 600DTE speed 600DTE speed 600DTE speed 600----115200bps115200bps115200bps115200bps Overall throughput: 3.7kbps wiOverall throughput: 3.7kbps wiOverall throughput: 3.7kbps wiOverall throughput: 3.7kbps with ACKth ACKth ACKth ACK 5.3kbps without ACK5.3kbps without ACK5.3kbps without ACK5.3kbps without ACK Single 5V or 3.3V (10mW max) supplySingle 5V or 3.3V (10mW max) supplySingle 5V or 3.3V (10mW max) supplySingle 5V or 3.3V (10mW max) supply Flow control Flow control Flow control Flow control –––– Hardware (CTS), None Hardware (CTS), None Hardware (CTS), None Hardware (CTS), None Usable range over 1kmUsable range over 1kmUsable range over 1kmUsable range over 1km BuiltBuiltBuiltBuilt----in command line configurationin command line configurationin command line configurationin command line configuration BuiltBuiltBuiltBuilt----in RF link diagnosticsin RF link diagnosticsin RF link diagnosticsin RF link diagnostics Remote overRemote overRemote overRemote over----air unit configurationair unit configurationair unit configurationair unit configuration Low operating currLow operating currLow operating currLow operating current, Auto standby modeent, Auto standby modeent, Auto standby modeent, Auto standby mode Conforms to European ETSI EN 300 220Conforms to European ETSI EN 300 220Conforms to European ETSI EN 300 220Conforms to European ETSI EN 300 220----3 and EN 301 4893 and EN 301 4893 and EN 301 4893 and EN 301 489----3 (at 10mW)3 (at 10mW)3 (at 10mW)3 (at 10mW) Conforms to Australian/New Zealand AS/NZS 4268:2003 (at 100mW)Conforms to Australian/New Zealand AS/NZS 4268:2003 (at 100mW)Conforms to Australian/New Zealand AS/NZS 4268:2003 (at 100mW)Conforms to Australian/New Zealand AS/NZS 4268:2003 (at 100mW) Dimensions: 39mm X 23mm X 15mmDimensions: 39mm X 23mm X 15mmDimensions: 39mm X 23mm X 15mmDimensions: 39mm X 23mm X 15mm Available as RPM1T transmitter and RPM1R receiver for one way comAvailable as RPM1T transmitter and RPM1R receiver for one way comAvailable as RPM1T transmitter and RPM1R receiver for one way comAvailable as RPM1T transmitter and RPM1R receiver for one way communicationmunicationmunicationmunication

Applications

GPS (NMEA) position reportingGPS (NMEA) position reportingGPS (NMEA) position reportingGPS (NMEA) position reporting Telemetry and telecontrolTelemetry and telecontrolTelemetry and telecontrolTelemetry and telecontrol EPOS equipment, barcode scanners, belt clip printers, stock control, job allocationEPOS equipment, barcode scanners, belt clip printers, stock control, job allocationEPOS equipment, barcode scanners, belt clip printers, stock control, job allocationEPOS equipment, barcode scanners, belt clip printers, stock control, job allocation Remote data acquisition system, data loggersRemote data acquisition system, data loggersRemote data acquisition system, data loggersRemote data acquisition system, data loggers InInInIn----building, environmental monitorinbuilding, environmental monitorinbuilding, environmental monitorinbuilding, environmental monitoring and control systemsg and control systemsg and control systemsg and control systems HighHighHighHigh----end security and alarm signallingend security and alarm signallingend security and alarm signallingend security and alarm signalling Automated Monitoring and Control SystemsAutomated Monitoring and Control SystemsAutomated Monitoring and Control SystemsAutomated Monitoring and Control Systems Fleet management, vehicle data acquisition Fleet management, vehicle data acquisition Fleet management, vehicle data acquisition Fleet management, vehicle data acquisition VHF Radio Packet Modem Radiometrix Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England Issue 1, 27 April 2007 RPM1 NEW Figure 1: RPM1-173.250-3 Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233

Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 3

1.1 OPERATING STATES

ADIO PACKET MODEM has three normal operating states:

• SHUTDOWN
• STANDBY
• CONNECTED SHUTDOWN The SHUTDOWN state is entered by asserting the WAKE/DTR input pin high (Vcc). It effectively forces the RPM1 into a suspended state. Communications cannot be made with the RPM1 in this state. WAKE/DTR pin should be pulled Low by host or connected to 0V to Enable the RPM1. STANDBY Immediately after power up and during normal operation, the RPM1 will automatically enter standby mode where it is waiting for a connection request from a remote RPM1 module. While in this mode a remote connection request can be received which will place the RPM1 into a connected state allowing it to then start receiving data from the remote unit. The connected host device can also send data to the RPM1 via the serial interface which will force the module to send a connection request to the remote RPM1 module, thus effectively setting up a logical connection between two units and allowing data to be transferred. C ONNECTED On receipt of a connection request from a remote unit, the RPM1 immediately enters a connected state. This effectively allows the RPM1 modems to start sending and receiving data. In-coming data is sent to the host via the serial port in the same form as it was given to the remote RPM1 module. Figure 4: RPM1 transmitting data at 5.3kbps during ZMODEM file transfer to a remote RPM1

Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 4

2 The Host Interface

2.1 SIGNALS

The connection to the RPM is a full duplex serial interface supporting baud rates from 600bps to 115200bps. Additional control signals are provided to assist in flow control, configuration and power saving in the RPM1. Figure 5: Physical dimensions and pinouts Pin name Pin Pin Function In/Out Description RF GND 1, 3 RF signal ground BNC casing/coax braid connection RF 2 RF signal Input or Output Antenna pin/coax core connection RXSELCT 4 Receiver Select Input or Output Internal RF Receiver Enable to BiM1 or RF Receiver Active Indicator TX SELECT 5 Transmitter Select Input or Output Internal RF Transmitter Enable to BiM1 or RF Transmitter Active Indicator TXD/AF 7 Transmitted Data or demodulated signal Input or Output Transmitted Packetised Data to BiM1 Analogue Demodulated signal from BiM1 D3 8 FRPC Data line NC Internal data line between RPM and FRPC D2 9 FRPC Data line NC Internal data line between RPM and FRPC SIGNAL 10 Preamble Detect Output Valid preamble indicator RST 11 FRPC reset NC Resets FRPC which also isolates BiM1 RXA 12 Receive Acknowledge NC RPM to FRPC download Request Acknowledge RXR 13 Receive Request Output Valid Data packet indicator RESET 14 Reset Input Hardware reset of the RPM1 SETUP 15 Enter Setup Input Enter RPM1 configurator after a RESET WAKE/DTR 16 Wake or Shutdown Input Wakes RPM1 when low, shuts down when high TXD 17 Serial transmitted data Input Host (DTE) to RPM1 serial transmit data RXD 18 Serial Received data Output RPM1 to host (DTE) serial received data CTS 19 Clear To Send Output Hardware flow control of data from host (DTE) DEFAULT 20 Force 9600bps Input Force the RPM1 serial interface to 9600bps VCC 21 Vcc Supply Input +5VDC or +3.3VDC GND 6, 22 Ground - Supply Ground internally connected to RF GND notes: 1. RXD/TXD lines are true data 2. Active low SETUP, DEFAULT inputs r equire external 10kΩ pull-up to VCC. 3. Logic levels are 5V CMOS unless 3.3V variant is used. 4. WAKE pin should be pulled to ground if DTE cannot provide DTR signal 5. TXSELECT, RXSELECT, SIGNAL, RXR, CTS can be connected to LEDs via 1k Ω series resistors

2.2 RADIO PACKET MODEM RESET

The Reset signal is internally pulled up to Vcc via a 10kΩ resistor. A reset aborts any transfers in progress and restarts the RPM1. H OST DRIVEN RESET Minimum low time: 1.0 µs, after reset is released (returned high). The host should allow a delay 1ms after reset for the RPM1 to initialise itself.

Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 5

2.3 HOST TO RADIO PACKET MODE DATA TRANSFER

Data is transferred between the RPM1 and the H OST using an asynchronous serial protocol. The default protocol settings are 8 data bits, no parity and 1 stop bit (8n1). The baud rate setting for the serial interface is user settable from 600bps to 115200bps. TXD Data from the connected host (DTE) is received by the RPM1 through TXD pin. CTS A single handshake line, CTS, controls the flow of data into the RPM1. The serial receive buffer of the RPM1 is 96 bytes deep. The CTS will be asserted High (VCC) by the RPM1 when the receive buffer hits approximately 66% full. It is advisable to limit the number of characters sent to the RPM1 after the CTS control line is asserted. This will help to reduce the possibility of lost data due to internal buffer overruns in the RPM1. The RPM1 will clear the CTS when the internal serial receive buffer falls below 33% full. RXD Upon the RPM1 receiving data from a remote unit, the received data is sent to the connected host (DTE) device through the RXD pin. 2.4 E NTERING RADIO PACKET MODEM CONFIGURATOR Configuring the RPM1 is accomplished by using a built-in command line configurator. The configurator is entered by asserting the S ETUP input of the RPM1 while resetting the RPM1. SETUP Holding SETUP low during a reset cycle will force the modem into the configurator. The state of this input is checked while the RPM1 starts up from either power on or reset. H OST DRIVEN SETUP The Setup pin may either be driven by the host (recommended) to enable host controlled configuration of the RPM1 or pulled up to VCC via a suitable pull-up resistor (10kΩ ). 2.5 F ORCING DEFAULT SERIAL BAUD RATE Asserting this pin low forces the RPM1 to start-up with a default baud rate of 9600bps, 8 data bits, one stop and no parity. D EFAULT During a RESET the HOST must hold DEFAULT low to force the RPM1 serial interface to default to 9600bps. This is ideal if the serial baud rate has been forgotten or incorrectly set. H OST DRIVEN DEFAULT The DEFAULT pin may either be driven by the host (recommended) or pulled up to V CC via a suitable pull-up resistor (10kΩ ). 2.6 F ORCING RADIO PACKET MODEM INTO SLEEP MODE Asserting the WAKE input high forces the modem into a low power sleep mode. This effectively shuts down the RPM1 and prevents it from sending or receiving any data. It is a method for conserving power when the modem is not required. WAKE / DTR During normal operation WAKE pin can be pulled high to force the RPM1 to shutdown into low power sleep mode. H OST DRIVEN WAKE The WAKE pin may either be driven by the host (recommended) or pulled Low to 0V.

Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 6 TECHNICAL SPECIFICATION Note: 1. RPM1 uses BiM1 (10kbps VHF Narrow Band FM) transceiver for its RF interface. Please refer to BiM1 data sheet for further details on the RF specification. 2. BiM1 (100mW/10mW) consumes 80mA/30mA on transmit and 8mA on receive 3. RPM1 Issue 1 maintains compatibility with the SHDN OFF feature in SPM2 RPM1 Issue 2 will shut the 1.280MHz oscillator down when WAKE pin is pulled High to reduce power down current. SHDN should be left as ON and WAKE pin should be pulled Low to Enable RPM1. 4. RPM1T transmitter and RPM1R receiver can only be used with ACKMODE set to OFF General Operating Voltage 5VDC or 3.3VDC Operating Current ACKMODE ON (100mW) Transmitting Receiving Average 62mA (Data streaming) Average 27mA (Data streaming) ACKMODE ON (10mW) Transmitting Receiving Average 32mA (Data streaming) Average 18mA (Data streaming) ACKMODE OFF (100mW) Transmitting Receiving Average 86mA (Data streaming) Average 12mA (Data streaming) ACKMODE OFF (10mW) Transmitting Receiving Average 42mA (Data streaming) Average 12mA (Data streaming) Auto-Standby 7mA (Waiting for Connection) Power-down 1.2mA or 400µA Standard Operating frequency 151.300MHz (100mW) 173.225MHz or 173.250MHz (10mW) Other custom frequencies between 120MHz-180MHz Channel spacing 25kHz Operating Temperature -10ºC to +60ºC Configuring options Built-in command line configurator Interface Serial Interface Inverted RS232 at 5V or 3.3V CMOS level Serial Protocol 8 data/1 stop/no parity Serial Signals RXD, TXD, CTS, WAKE Power down Control Via WAKE/DTR signal Serial Handshaking Selectable as CTS signal or none DTE Interface Speed 600/1200/2400/4800/9600/19200/38400/57600/115200 bps Air Interface Speed 10kbps Overall throughput – Acknowledged 3.7kbps (max) 1.2kbps (slots) 0.6kbps (slotsw) – Unacknowledged 4 5.3kbps (max) 1.2kbps (slots) 0.6kbps (slotsw) Receiver Sensitivity -115dBm for 1ppm BER LO leakage (conducted) -70dBm Transmitter Output Power +20dBm (100mW) ±1dB (5V variant only) +10dBm (10mW) Spurious Emissions AS/NZS 4268:2003 limits (100mW variant) EN 300 220-3 limits (10mW variant)

Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 7

3.0 RADIO PACKET MODEM CONFIGURATION

3.1 E NTERING THE CONFIGURATOR The RPM1 is configured by entering the built-in software configurator. Current argument can be displayed by entering parameter / command without argument 3.2 U SER CONFIGURABLE PARAMETERS C ONFIG Display a list of the current RPM1 configuration. This will also set FLOW control to none to enable simple 3 wire serial communication Valid range None D EFAULT Set all RPM1 configuration settings to their factory default values. Valid range None R ESET Exit the modem and force a software reset. Any changed parameters will take effect after the modem has restarted. When exiting the configurator, the H OST device must ensure the SETUP pin is high otherwise the configurator will be re-entered after the reset. Valid range None U NIT Sets the unit number. Two RPM1 modules can communicate with each other provided they have matching Unit numbers and Site codes. default 0 Valid range 0 to 15 S ITE Sets the Site address The site number is used to distinguish between groups of operating modems. The site code is an address extension to the unit number. default 0 valid range 0 to 7 A DDR Updates the unit number value. This command is used for changing the unit number in RAM without updating the unit number stored in EEPROM. This enables the RPM1 to support point-to- multipoint communications. Upon using this command the configurator is exited and the modem operation is resumed. The modem is not reset when the configurator is exited. default 0 Valid range 0 to 15 B AUD Sets the host interface baud rate. The changed baud rate will take effect after resetting the RPM1. default 9600 valid range 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 T HRUPUT Sets the on-air data throughput. Three possible settings are provided. max: sets the maximum data throughput of the RPM1. slots: effectively reduces the on-air throughput. This opens up ‘time slots’ allowing other RPM1 pairs, operating within close proximity, equal opportunity to transmit data. slotsw: increases the ‘time slots’ even further to allow more RPM1 pairs to operate. default max valid range max, slots, slotsw

Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 8 FLOW Sets the serial flow control between the host and RPM1. Using no flow control enables the RPM1 to be used with a 3 wire serial link (TXD, RXD, GND). Care must be taken in order to prevent overflowing the 96 byte serial receive buffer in the RPM1. Using hardware flow control enables the RPM1 to control the flow of serial data being received. default none valid range hw, none SERDLY Sets the serial data receive to packet transmit delay. When the RPM1 receives the first byte of data from the host, it starts a timer running. Either a full buffer of data to send or a timeout of this timer will allow the packet to be transmitted. Fine tuning this delay for the baud rate the RPM1 is operating at can significantly increase throughput while reducing unnecessary transmissions. default 2 (x10ms) valid range 2 to 255 (x10ms) S HDN Sets the action of the WAKE input. Setting shutdown to ON will cause the RPM1 to monitor the WAKE input. When WAKE is taken high the RPM1 will be forced into low power sleep mode, thus reducing current consumption. Subsequently lowering the WAKE input will bring the RPM1 out of low power sleep mode. SHDN should be set to OFF or WAKE pin should be pulled Low when the host (DTE) cannot provide DTR control signal to wake RPM1 in a 3-wire serial interface. Do not set it to OFF for RPM1 Issue 2. default On valid range on, off R ETRY Sets the number of data retry attempts. RF interference can cause a transmitted data packet to be lost or corrupt on reception. If this happens the RPM1 will retransmit any unacknowledged transfer. The transmission will be retried the specified number of times before the link to the remote unit is considered ‘lost’ and the data purged. default 5 valid range 1 to 63 S TRTMSG Enables the startup message. The startup message is enabled by default, thus giving an immediate indication of the operation of the RPM1. The message can be disabled prior to deployment of the RPM1 module. default On valid range on, off A CKMODE Enables transfer acknowledgements. This function enables packet transfer acknowledgements to be returned for every outgoing packet. Packet acknowledgements aid in the delivery of error free and consistent data transfers between a pair of modems. Disabling the acknowledgements results in higher data throughput between modems, but does not protect against lost data due to RF interference. It should be disabled while using RPM1 in a broadcast mode. Do not set it to ON for RPM1T and RPM1R as they cannot establish connection. default On valid range on, off R EMOTE Enables remote configuration. Over-air remote configuration of a RPM1 module is possible once it has been enabled. The remote command is used to send remote configuration commands. See the following chapter for a overview of remotely configuring a RPM1 module. default Off valid range on, off RADAR Starts the radar test. Used as a range or confidence test between RPM1 modules within the same site. parameter Unit number between 0 and 15.

Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 10

4.0 EXTENDED RADIO PACKET MODEM FEATURES

4.1 T HROUGHPUT The RPM1 supports three rates, max (3.6kbps), slots (1.2kbps) and slotsw (600bps), of over-air throughput. M AX: When set to maximum and streaming data at the RPM1, the data is sent as quick as possible. For host baud rates of 4800bps and above, data is transmitted continuously with minimal delay between sequential packets. When this occurs, there is effectively no airtime for another pair, operating in close proximity, to transmit without causing collisions. The maximum over-air throughput that can be achieved is 3.6kbps with ACK and 5.4kbps without ACK. Figure 8: RPM1 pair streaming data without gap for another RPM1 pair In Figure 8, RS232 serial data bytes accumulated in the receive buffer is transmitted as two 10kbps bursts by transmitting RPM1 with gaps just enough to receive ACK from receiving RPM1. FIGURE 9: RPM1 pair streaming9600bps serial data with ACK at maximum throughput For continuous data transmission at baud rates above 2400bps (with ACK) or 4800bps (without ACK), hardware flow control should be used to prevent the host from causing receive buffer overrun errors. RPM1 will signal CTS pin to stop/allow the host depending on its Receiver Buffer level.

Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 12

4.2 Remote Configuration

Remote configuration of a RPM1 module is possible using the R EMOTE command from within the configurator. The remote RPM1 unit should be on or in auto-standby mode. Initially the R EMOTE command is used to enable and disable the ability to remotely configure a module, as described in section 3.2: User Configurable Command. Once remote configuration is enabled the R EMOTE command is then used to issue configuration commands to a remote RPM1. The format for the remote command then becomes: REMOTE <SERIAL NUM> <COMMAND> <PARAMTER> The <SERIAL NUMBER> of the remote RPM1 must be known in order for the remote configuration request to be executed on the appropriate RPM1 module. The <COMMAND> to be executed can be any of the following: Baud 600,1200,2400,4800,9600,19200,38400,57600,115200 Unit 0 to 15 Site 0 to 7 Shdn on/off Flow hw/none Serdly 2 to 255 Retry 1 to 63 Strtmsg on/off The < PARAMETER> is optional, and if not specified the setting for that command is returned and displayed. 4.3 P OINT-TO-MULTIPOINT The RPM1 can be used for point-to-multipoint communications. One module must be considered to be the master, which is used to address up to 15 remote units in any one site. During normal operation, the base unit can be set to address another unit dynamically by entering the configurator and using the A DDR command to change the unit address. Upon execution of this command, provided the parameters are correct, the configurator is exited immediately. A period (‘.’) is sent to the connected host device to indicate that the change has been registered and the RPM1 is now ready for communications to the new unit address. A DDR is very similar to the Unit command, except that ADDR does not update the stored EEPROM unit value. As the EEPROM has a limited number of write cycles, using ADDR for addressing multiple units in a point to multipoint network is recommended. Also, the ADDR command will exit the configurator immediately, which is required to resume communications very quickly. 4.4 B ROADCAST MULTIDROP The RPM1 has a broadcast mutidrop mode which provides a mechanism for building a large networks. This mode of operation is determined by the configuration command keyword ACKMODE being set to OFF. In broadcast mutidrop mode, the RPM1 does not implement network layer functionality related to data packet routing, acknowledgement and retries. The connected host device should provide network layer functionality. The site code and unit address is still used by the radio modem when working in broadcast multidrop mode. For a given multipoint network all radio modems within a group must contain the same site code and unit address.

Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 13

4.5 RADAR: DIAGNOSTIC TEST

Built into the configurator is a diagnostic test suitable for range testing and link confidence testing. The Radar test effectively sends a small request packet to a remote unit then waits for a reply. The remote unit must not be in the configurator otherwise it will not respond. Upon receipt of a positive response from the remote unit, a success is recorded before the process is repeated. This test will continue indefinitely until it is ended by a key press.

4.6 Radio Packet Modem Error Handling

RPM1’s radio decoder module is deliberately non bit error tolerant, i.e. no attempt is made to repair corrupt data bits. All of the redundancy in the code is directed towards error checking. For an FM radio link using short packet lengths, packets are either 100% or so grossly corrupt as to be unrecoverable. By the same reasoning, the Host is not informed or sent corrupt data since corrupt information is of little value. The RPM1 implements packet acknowledges, timeouts and re-transmission to accomplish reliable error handling.

Ordering information

RPM1 issue 2 will be supplied as default. Part number RF output Supply RPM1-151.300-3 100mW 5V RPM1-173.225-3 10mW 5V RPM1-173.250-3 10mW 5V RPM1-151.300-3-LP 10mW 5V RPM1-151.300-3-LP-3V 10mW 3.3V RPM1-173.225-3-HP 100mW 5V RPM1-173.250-3-HP 100mW 5V RPM1-173.225-3-3V 10mW 3.3V RPM1-173.250-3-3V 10mW 3.3V Above RPM1 transceiver can also be ordered as separate RPM1T transmitter and RPM1R receiver.

Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 14 Appendix A Figure 7: Example circuit to make radio modem with DCE type RS232 interface

231 Kenton Lane

Harrow, Middlesex HA3 8RP ENGLAND Tel: +44 (0) 20 8909 9595 Fax: +44 (0) 20 8909 2233 sales@radiometrix.com www.radiometrix.com Copyright notice This product data sheet is the original work and copyrighted property of Radiometrix Ltd. Reproduction in whole or in part must give clear acknowledgement to the copyright owner. Limitation of liability The information furnished by Radiometrix Ltd is believed to be accurate and reliable. Radiometrix Ltd reserves the right to make changes or improvements in the design, specification or manufacture of its subassembly products without notice. Radiometrix Ltd does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may result from the use of its products. This data sheet neither states nor implies warranty of any kind, including fitness for any particular application. These radio devices may be subject to radio interference and may not function as intended if interference is present. We do NOT recommend their use for life critical applications. The Intrastat commodity code for all our modules is: 8542 6000. R&TTE Directive After 7 April 2001 the manufacturer can only place finished product on the market under the provisions of the R&TTE Directive. Equipment within the scope of the R&TTE Directive may demonstrate compliance to the essential requirements specified in Article 3 of the Directive, as appropriate to the particular equipment. Further details are available on The Office of Communications (Ofcom) web site: http://www.ofcom.org.uk/radiocomms/ifi/ Information Requests Ofcom Riverside House 2a Southwark Bridge Road London SE1 9HA Tel: +44 (0)845 456 3000 or 020 7981 3040 Fax: +44 (0)20 7783 4033 information.requests@ofcom.org.uk European Radiocommunications Office (ERO) Peblingehus Nansensgade 19 DK 1366 Copenhagen Tel. +45 33896300 Fax +45 33896330 ero@ero.dk www.ero.dk