Syncomm Technology RADIOPORTB1990 RADIO PORT User Manual Specification

Syncomm Technology Corp. RADIO PORT Specification

Specification

1Radio Port (RP) B1990 RP Functions The RP provides the link between Subscriber Unit (SU) and Radio Port Control Unit (RPCU). Extremely compact and lightweight, Syncomm's RP is economical to purchase and can be installed outdoors for excellent coverage. The following are basic RP functions: n Link between SU and RPCU Whether in making a phone call or receiving an alerting message, the user's SU communicates with the wireline network element (RPCU) through the RP which functions as a RF modem over the air interface. n Transmission/reception of radio signals Each RP transmitter takes a framed and encoded signal from the modulator and converts it to the appropriate carrier frequency. The RP transmitter then transmits a π/4 DQPSK(Differentially encoded Quadrature Phase Shift Keying) signal with a TDM radio channel structure out to the SUs. The uplink TDMA bursts are transmitted by the SUs arrive at the RP, where the TDMA signals are amplified, translated in frequency, demodulated, diversity combined, synchronized, decoded, and converted to a TDM line interface signal for transmission to the RPCU. n Channel coding/decoding for error detection and burst synchronization The burst is synchronized between RP and SU. Error detection is employed to mitigate the errors induced during transmission. Because the entire burst is only 120 bits long, synchronization and error detection processes are combined. Placing the burst encoding/decoding circuitry at the RP helps to minimize the RP-to-RPCU transmission requirements. n Synchronization The local reference clock at the RP will extract the timing from the transmission wireline facility (e.g., HDSL) to synchronize itself to the network and may reference all transmit and receive frequencies to the same oscillator, that is, to maintain the stability of transmit and receive frequencies. n Termination of air interface Message sets, measurement and performance monitoring data, signaling information and operations data are combined with the 384Kbps RF channel data to make up the transmission facility (e.g., HDSL). n Mapping of radio channel bit rate(384kbps) to standard HDSL line rate The radio channel bit stream is mapped into a HDSL line rate by bit stuffing, and then the unchannelized HDSL signal is transported over a wireline network facility to the RPCU. The purpose is to provide a standard physical level line interface.
2n Performing Self-diagnostics, remote tests and maintenance checks The RP is equipped with self-diagnostic capabilities that are executed at power up or upon receiving designated test commands. The RP continuously monitors its hardware and its environment; alarms are generated if any fault is detected. The RP collects QI, WEI, RSSI, and performance of RP circuitry information and passes it to the RPCU. The RP utilizes the loopback function to determine if the RP electronics are in proper working order. This test can be administered remotely via data links. n Word Error Indication(WEI) measurement The RP performs WEI measurement and forwards detected error indications to the RPCU for further processing. The uplink WEI is automatically sent back to the SU on the next downlink as well. n Received Signal Strength Indication(RSSI) measurement The RP determines the strength of signals received in each burst and forwards those measurements to the RPCU for further processing n Quality Indication(QI) measurement While in communication with the SU, the RP continuously monitors the receive signal quality of the radio link between itself and the SU by measuring the signal-to-impairment ratio. Impairments include thermal noise and interference. This information, used as the input to the uplink power control procedure, is transmitted back to the RPCU for processing. Function Specifications Basic Functions l Operating Frequency band Transmit 1930.5-1989.6 MHz Receive 1850.5-1909.6 MHz l Air Interface Standard JTC (J-STD-014) l Access Method TDM/TDMA l Time Slots/Carrier 8 l Channel Spacing 300 kHz l Modulation Scheme π/4 DQPSK l Frequency Assignment QSAFA l Frame Length 2.5 ms l Operating Temperature -20 oC to +50oC Interface with RPCU l P-interface Connect to RPCU via P-interface using HDSL transmission. The P-interface carries an embedded operations channel (EOC) which conveys commands for performing QSAFA.
3l Performance Monitoring The overall status of the RP is reported back to the RPCU when a failure occurs. Transmission Characteristics l RF Output Power at antenna terminal 800 mW (+29 dBm). The output power is controllable in four steps, from 0 mW to 800 mW. l Adjacent channel power emission Less than 8 µW at +/- 600 kHz Less than 2.5 µW at +/- 900 kHz l Spurious Emission Less than -13 dBm on transmission band Less than -74 dBm on receiving band Complies to FCC standard on other band l Output Impedance 50 ohms (nominal) Receive Characteristics l Receiving sensitivity Better than -101 dBm at 25oC (WER :3%, static) l Selectivity More than 0 dB at +/- 300 KHz at 25oC More than 50 dB at +/- 600KHz at 25oC l Antenna diversity 2-branch antenna selection diversity. One antenna supports duplex receive and transmit. The other only supports receive. Mechanical Specifications (Reference Only) l Dimensions 39 cm (W) X 25 cm (H) X 9 cm (D) l Weight Less than 10 kg (doesn't include antenna and cable) l Power supply Line Powered from RPCU. No Separate Battery Backup
4Block Diagram TXRXRFMODEM BMCCPUI/FControl PSRPCUPowerSource n Controller Ø Handling the handshaking among RF, Encoding/Decoding, Radio Channel Measurements and Line Interface Module Ø Processing the Layer-2 and Layer-3 protocol between RP and RPCU. Ø The wireline transport between an RP and RPCU can be provided by HDSL line interfaces. The RP shall convert the RF channel rate of 384Kbps into the appropriate line transmission bit rate. n RF Ø The channel spacing shall be 300KHz. The port shall receive on the low band, 1850 to 1910MHz, and transmit on the high band, 1930 to 1990MHz of the duplex frequency allocation. Ø By performing the diversity combining or selection at the RP, the line transmission rate to the network can be at the channel rate. Diversity selection is performed after decoding both branches. The error free word is chosen, with the corresponding received power and quality indicator used for power control. If there is a tie, then the branch with the higher power shall be selected. Ø The transmit and receive frequencies shall be synthesizer-controllable, with the frequency specified by the control signaling. n Power Source Ø Power Source can convert line power to 5Vdc to power up the RP and let RP work properly. Ø Power Source can split the HDSL signaling and Power from line input. n Antenna
5Ø Omni-directional antenna for PACS Ø Electrical Specification Frequency range/MHz 1850-1990MHz Gain/dBi 8.0dBi VSWR Max. 1.5 Polarization Linear vertical 3dB beamwidth/H-plane 360 degree 3dB beamwidth/E-plane 15 degree Power handling 200W Impedance 50 Ohms Connector Type N-female Ø Environmental & Mechanical Characteristics Survival wind speed 180km/hr; max Temperature -40 oC to +85 oC Humidity 100% @ 25 oC Lightning Protection DC ground Radome color Gray-White Radome material Fiberglass Radiator material Copper & Brass Weigh 1kg
6Ø Dimensions(mm)

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