Adjacent Channel Rejection | Black Box MWU2000-G703, MWU2000-X21

2.048Mbps Wireless Modem

causes a degradation of 3db in the sensitivity of the receiver. The graph below displays the adjacent channel rejection of the modem receiver as a function of the frequency separation (Delta F in MHz) between the frequency of the interfering signal and the desired signal.

Figure 5-2. Adjacent Channel Rejection

Separate between TX and RX frequencies

Minimum 12MHz for sensitivity degradation of 1dB.

TECHNICAL: 0118 931 2233

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Black Box MWU2000-G703, MWU2000-X21, MWU2000-V35 manual Adjacent Channel Rejection, Separate between TX and RX frequencies

Contents

Basingstoke Road, Reading, Berkshire RG2 0QN 0118 965 Sales 0118 965 048Mbps Wireless Modem 048Mbps Wireless Modem Contents Set-up and Configuration Properly General About this Manual Introduction Product Description 2.048Mbps Wireless Modem High Speed Communication Error-Free Data TransferSeamless Communication Versatility Co-location Choice of Antennas, Cables and RF Accessories048Mbps Wireless Modem Benefits 048Mbps Wireless Modem Components RS530 Line Interface Unit Adaptive Equalization Fractional E1 with Echo CancellationFractional T1 With Echo Cancellation Modem Separate DSP Transmit and Receive Modems Antennas Radio Front Panel Indicators GeneralLine RXD and TXD Rx SyncTX Sync 048Mbps Wireless Modem Connections E1 or Fractional E1 LIU 048Mbps Wireless Modem Connectors Installation Antennas and Accessories Installing the 2.048Mbps Wireless Modem GeneralPackage Components To Set the Clock Rate V.35/RS-530/X.21 only To Configure the Unit as Master To Configure Channels with Echo Cancellation- Fractional E1 To Configure Channels Fractional E1 To Configure Channels- Fractional T1 To Configure Channels with Echo Cancellation- Fractional T1 Basic Antenna Uni-8.5 Antennas, Cables and Accessories Medium Gain 12dBi Antenna Uni-12 Basic 8.5 dBi Antenna Showing Installation screws Medium Gain 18dBi Antenna Uni-18 Medium Gain 12dBi Antenna High Gain Antenna Uni-24 Medium Gain 18dBi Antenna High Gain 24dBi antenna RF Accessories Antenna CharacteristicsTPA 24 Transmit Power Amplifier TPA 24 Connections Diagram Installing the TPA Achievable improvement through the use of LNA-10 LNA-10 Low Noise Receive Amplifier LNA Improvement table Installing the AL-1 Lightning Arrestor LNA-10 Cable Connection Diagram Low Loss Cable Cable TypesThin Cable Thick Cable 11. Wall Mount with Azimuth Alignment Only Antenna Sets 12. Wall Mount with Azimuth and Elevation Alignment European Range Table USA Range Table Range Tables Maximum Unregulated Range Table Antenna AlignmentVisually Aligning the antennas Activating the front panel LEDs To activate the front panel LEDs 14. Rssi measurement connection diagram 15. Rssi test point accuracy 048Mbps Wireless Modem Synchronizing Co-located Modem Units 18. Default position NC of the Jumpers in the Receive Module Setting the relevant parameters Installing the Antennas Maximum Number Synchronized Links 21. Connecting Units for Synchronization Connecting the Master units Main Menu Set-up and ConfigurationSet-up and Configuration Functions Accessing the Set-up and Configuration Functions Mode and Access Control Menu Parameters MenuCounters and Tracers Menu To make selections using the Parameters menu System ResetTesting To access the Parameters Menu LIU Parameters Menu E1 Parameters MenuE1 Parameters Menu Items and Actions Fractional EI Parameters Manu E1 Alarm Buffer Fractional E1 parameters Menu Items and Actions Remote Alarm Method CRC4 Usage Echo Canceller disabling methodFractional E1 Alarm Buffer Long haul/Short haul Pulse Shape T1 Alarm BufferT1 Parameters Menu T1 Parameters Menu Items and Actions Fractional T1 Parameters Menu 048Mbps Wireless Modem 048Mbps Wireless Modem Superframe Method D4 Yellow Alarm Method Pulse Density Enforcer Echo CancelerCRC6 Usage Bit 7 Zero Suppression Fractional T1 Alarm buffer 35/RS530/X.21 Parameter Menu V.35/RS-530/X.21 Parameters Menu Items and ActionsDCE/DTE Functionality Options Clock Polarity Loopback Mode Menu Loopback Mode Menu Items and Actions MCP Parameters Menu Line Interface Unit Type MenuLine Interface Unit Type Menu Options Total Link Delay MCP Parameters Menu OptionsMaster-Slave Modem Initialisation String Central Site Management Using a Dial-up Modem AT&f\n Modem Rate 11. Default Modem Rate According to Selected LIU Data RatRadio and Modem Parameters Menu 10. Radio and Modem Parameters Menu Options Remote Parameters Hoping SequenceAdd/Remove Channels from Test Sequence Switch to Remote Monitor Switch to Local Monitor12. Remote Parameters Menu Options Copy database and download to remote unit Load Default Values MenuPing Remote Unit Download remote database to remote unit Parameter Info. Screen 13. Load Default Values Menu options To make selections from the Counters and Tracers Menu To access the Counters and Tracers Menu System Counters 2.048Mbps Wireless Modems Counter display 14. Buffers Name and Description 15. Modem Rate Vs. Buffer Size Channel Tracer Rssi per channel 16. Rssi Levels Channel Tracer Errors Per Channel Time Tracer Errors versus Time Time Tracer Max Consecutive Errors versus TimeClear System Counters and Channel Tracer Set Time Tracer Resolution 17. Delay Setting⇒ To set the time intervals Clear Reset Counter Reset Counters Correction Watch AlarmsMessage Description Remote Frame Alarm Message Rlos framer un-synchronized Radio Alarms Message Warning LIU Clock drift, Check clock configuration General Alarms Message Warning Difference in parameters between two units Site Survey Mode Change Access Rights Menu System Reset Menu Introduction Troubleshooting ⇒ To check radio link performance Problem 2 Poor performance of radio link⇒ To check the configuration of each unit ⇒ To check RF Installation To correct the configuration ⇒ To check each unit configurationTo check synchronization at radio level From the Parameters menu, select Parameters Info. Screen 048Mbps Wireless Modem To view isolated bursts of errors To reduce echo on voice channelsTo improve data rate Problem 7 The system resets with an error message 048Mbps Wireless Modem Error Messages Source If Faxes does not work properly If the telephones does not work properly 048Mbps Wireless Modem Transmission Technique Technical SpecificationsWireless Modem Technical Specifications Models Radio Type System Bandwidth Default Modem Rate According to Selected LIU Data RateTransmitter Output Power Channel Bandwidth Maximum Spurious Level Receiver SensitivityReceiver Sensitivity as a Function of the Radio BER Maximum Receive Level Recommended Receive LevelAdjacent Channel Rejection Separate between TX and RX frequencies Adjacent Channel Rejection Maximum Number of Links to Synchronize Maximum Number of Synchronized LinksFilter Curves 101 Line Interface Specifications RS-530 Interface Fractional T1 InterfaceFractional E1 Interface Interface Front Panel LED Indicators Connectors103 Mechanical Specifications Environmental SpecificationsStandards Antennas Sets TPA 24 Technical SpecificationsLNA-10 Technical Specifications 105 106 AL-1 Technical Specifications 107 Appendix a V.35/RS-530/X.21 Applications DCE/DTE ConfigurationConfiguration Options Table A-1. Possible DTE/DCE Configurations Synchronizing your Modem to Another Network 048Mbps Wireless Modem Standard ConfigurationTable A-2. Configuration 109 RS-530/V.35/X.21 Back-to-Back Configuration Connecting your 2.048Mbps Wireless Modem to another modem DCE Options 111 Setting the DCE/DTE Mode Parameter To set the DCE/DTE modeDTE Options 113 Appendix B E1 / T1 Applications E1/T1 Connections and Common Problems Link Setup E1/T1 LIU Jumper Settings 115Table B- 1. E1/T1 Connections Figure B-2. E1/T1 Board Location To access the jumpers 117 Figure B-3. E1 Unbalanced Coax connector, 75 W Figure B-6. T1/DSU Network Interface T1 CSU/DSU Applications 119 E1/T1 Back-to-Back Configuration Appendix C Fractional E1/T1 Applications When to Use the Fractional E1/T1 LIU 121 Table C-1. Channels Characteristic Table C-2. Fractional E1/T1 Connections Fractional E1 LIU Jumper Settings Figure C-2. Fractional E1 Board Location 123 Figure C-3. Fractional E1 Unbalanced Coax connector, 75 W Fractional T1 CSU/DSU Applications 125 Echo Cancellation in Fractional E1/T1 Applications Fractional E1/T1 Back-to-Back Configuration 127 Potential Problems in Fractional E1/T1 Applications To separate DC input Appendix D Installing Other Types of Receive Amplifiers To supply DC input through the RF cable 129 Table E-1. E1/T1 and Fractional E1/T1 Pin Connections LIU RS-530 Connector Pin AssignmentsAppendix E Pin Assignments E1/T1 and Fractional E1/T1 Pin Connections LIU D-25 to V.35 Cable Pin Assignments 131 Figure E-3. LIU D-25 to X.21 Cable Pin Assignments LIU D-25 to X.21 Cable Pin Assignments