Syncomm Technology RADIOPORTB1990 RADIO PORT User Manual Specification

Syncomm Technology Corp. RADIO PORT Specification

Specification

1
Radio 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.
2
n 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.
3
l 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 con
trollable 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
4
Block Diagram
TX
RX
RF
MODEM BMC
CPU
I/F
Control PS
RPCU
Power
Source
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
5
Ø 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
6
Ø Dimensions(mm)

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