4xE1/T1 MUX Channel Configurations ..............2-7 2.9 H ............... 2-8 TANDBY ROTECTED ONFIGURATION 2.9.1 Hot/Cold Standby Modes ..................2-9 2.9.2 Hot Standby Control using the Moseley TP64............ 2-10 2.9.3 Hot Standby Control with Single Unit............... 2-13 2.10 S ....................2-14 NSTALLATION 2.11 A ................... 2-14 NTENNA YSTEM 2.11.1...
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4 DATA INTERFACE CABLES .......4-1 5 APPENDIX ..................5-3 5.1 P ................5-3 VALUATION NFORMATION 5.1.1 Introduction ....................5-3 5.1.2 Path Analysis ....................5-7 5.2 A & A .................. 5-14 BBREVIATIONS CRONYMS 5.3 C ....................5-16 ONVERSION HART 602-95555-01 Rev A NXE1-20 Digital Radio...
Figure 1-1. NXE1-20 Modular Open Architecture The high spectral efficiency of the NXE1-20 is achieved by user-selectable QPSK, or 16 QAM. Powerful Reed-Solomon error correction, coupled with a 20-tap adaptive equalizer, provides unsurpassed signal robustness in hostile RF environments. .
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System Specifications & Description § Built-in BER Meter § Built-in NMS § Monitoring & Time Stamping § Monitor up to 4 external Analog & Digital I/O § Readout of RSL in dBm § Completely modular 602-95555-01 Rev A NXE1-20 Digital Radio...
1.3.2 Standalone Operation The NXE1-20 may be used as a standalone digital radio with an interface in the modem or with a Multiplexer with 2 or 4 E1/T1 interfaces. The Multiplexer has an overhead channel which can be utilized by the customer 1.3.3...
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CNTL ANTENNA TP64 TRANSFER PANEL RX RF DATA SPLITTER SWITCH/ DATA DUPLEXER TRANSFER TX RF LOGIC RELAY DATA CNTL NXE1 RADIO B Figure 1-3. NXE1-20 Hot Standby – Two Discrete Radios with Transfer Panel 602-95555-01 Rev A NXE1-20 Digital Radio...
(DC Optional) Channel 3 Front Panel Interface 4 Port Channel 4 Front Trunk Front Panel Panel Ribbon Cable Serial PC Interface 4 x 20 LCD Display Status/Command/Control I/O Status LEDs Transfer Panel I/O BarGraph NXE1-20 Digital Radio 602-95555-01 Rev A...
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System Specifications & Description Figure 1-12. NXE1-20 System Block Diagram All modules (excluding the Front Panel and Power Amplifier) are interconnected via the backplane that traverses the entire width of the unit. The backplane contains the various communication buses as well as the PA (Power Amplifier) control and redundant transfer circuitry.
(Forward Error Correction) bits while interleaving the blocks of data. The result is a very spectrally efficient, yet robust linear modulation scheme. This process requires an ultra-stable master clock provided by an OCXO (oven controlled crystal oscillator) that is accurate to within 0.1 ppm. NXE1-20 Digital Radio 602-95555-01 Rev A...
Module via an external (rear panel) semi-rigid SMA cable. This module performs the necessary upconversion to the RF carrier (see Figure 1-16). There is an on-board CPU for independent control of the critical RF parameters of the system. 602-95555-01 Rev A NXE1-20 Digital Radio...
RF signals resulting from RF bandwidth that is much wider than the IF bandwidth. The linear QAM scheme is fairly intolerant of amplifier overload. NXE1-20 Digital Radio 602-95555-01 Rev A...
The output is an aggregate data stream that is distributed to the trunk port for if the data input/output is out of the Modem, or to the backplane for connection to the multiplexer connected on the backplane. 602-95555-01 Rev A NXE1-20 Digital Radio...
2 Installation 2.1 Unpacking The following is a list of all included items. Description Quantity Digital Radio (3RU chassis) Rack Ears (with hardware) Extender Card (Universal QAM) — optional Power Cord (IEC 3 conductor for AC, 2-wire for DC) Manual ( or Soft copy on a CD) Test Data Sheet (customer documentation) Be sure to retain the original boxes and packing material in case of return shipping.
Figure 2-1. Other mounting methods are possible by changing the orientation of the rack ears. Figure 2-1.NXE1-20 Typical Rack Mount Bracket Installation 2.4 Duplexer: Internal/External Various duplexers, both internal and external, can be utilized. For current duplexers utilized with the radios, please see the Appendix.
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Installation Figure 2-2.NXE1-20 Rear Panel Connections Power Supply: Inputs: Universal Input, 100-240V, 50/60 Hz; IEC 3 conductor 24v/48v (Isolated Input); 2 pin socket (custom) Status LED: +12V: Green LED indicates +12 volt supply OK +5V: Green LED indicates +5 volt supply OK...
Power Supply Card Slot Details The leftmost slot in the NXE1-20 card cage (as viewed from the rear of the unit) is designated as the “PRIMARY A” power supply. The main bus voltages (+5 and +/-12) are summed in the backplane and provide the supply the plug-in modules.
Power supply module should be serviced by qualified personnel only. 2.6.3 DC Input Option An optional DC input power supply is available for the NXE1-20; using high reliability, DC-DC converter(s) capable of operation within the following input ranges (dependent upon nominal input rating):...
Installation 2.7 Power-Up Setting As shipped, the NXE1-20 will radiate into the antenna upon power-up, THIS ASSUMES THAT THE ANTENNA LOAD IS GOOD (LOW VSWR). If the VSWR of the load causes a high reverse power indication at the PA, the red VSWR LED will light and the transmitter will cease radiating.
Aux Channel 1 Aux Channel 2 Figure 2-3. 4XE1/T1 MUX Panel The 4xE1/T1 MUX is a high speed card (up to 8 MBPS) that has a total of 7 ports. Table 2-1 summarizes the capabilities. NXE1-20 Digital Radio 602-95555-01 Rev A...
256 KBPS) Table 2-2.NXE1-20 Voice/Data MUX Channel Configurations 2.9 Hot Standby (Protected) Configuration The NXE1-20 may be installed in a hot standby (protected) configuration. This consists of twoNXE1-20 chassis with a TP64 transfer panel (Figure 2-5) Transfer Panel Connection The usual hot standby configuration uses an external duplexer.
DATA TP64 Rear Panel RJ45 NXE1 Radio B DATA Figure 2-5.NXE1-20 Hot Standby – with Transfer Panel 2.9.1 Hot/Cold Standby Modes Hot Standby ( *preferred) Hot standby leaves both transmitters in the RADIATE ON condition, and the transfer logic controls the RF relay to select the active transmitter, thereby decreasing switchover time. This is the preferred operating mode.
Installation 2-10 2.9.2 Hot Standby Control using the Moseley TP64 2.9.2.1 TP64 Front Panel Controls and Indicators Note: See the following section for a detailed description of the Master/Slave logic implemented in the TP64. Figure 2-7. TP64 Front Panel LED Indicators...
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In Hot Standby configurations, this will not buy the user anything in terms of reliability. In Cold Standby, the “burn time“ is more significant, since the RF power amplifier device operating life becomes a factor. NXE1-20 Digital Radio 602-95555-01 Rev A...
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Clk Phase NORMAL Control Settings These settings configure the transmitter for hot (or cold) standby. It is important that each NXE1-20 radio in the redundant pair is configured identically for proper operation. In the SYSTEM TRANSFER menu: Transfer Tx Transfer ______...
The full array of available settings for the Control and Configuration menus are located in Section 3—Operations. Shown here are the applicable settings for single systems. Clock Settings All controls and indications can be found on the NXE1-20 front panel LCD display (located in the QAM Radio/Config/ModA or ModB Menu). QAM Interface...
2.10 Site Installation The installation of the NXE1-20 involves several considerations. A proper installation is usually preceded by a pre-installation site survey of the facilities. The purpose of this survey is to familiarize the customer with the basic requirements needed for the installation to go smoothly.
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2-15 Installation EIRP at the antenna is calculated as follows:- Transmit power – Cable loss + Antenna Gain = EIRP +31.1dBm – 6dB(for 100m LDF5-50A) +36dBi = 61.1Bmi NXE1-20 Digital Radio 602-95555-01 Rev A...
3.2.1 LCD Display The Liquid Crystal Display (LCD) on the NXE1-20 front panel is the primary user interface and provides status, control, configuration, and calibration functionality. The menu navigation and various screens are explained in detail later in this section.
<LEFT>,<RIGHT> Used to select between conditions (such as ON/OFF, ENABLED/DISABLED, LOW/HIGH, etc.) as well as to increase or decrease numerical values. 602-95555-01 Rev A NXE1-20 Digital Radio...
DO NOT change any settings in the CONFIGURE or CALIBRATE screens. The security lock-out features of the software may not be fully implemented, and changing a setting will most likely render the system non-operational! NXE1-20 Digital Radio 602-95555-01 Rev A...
The LAUNCH screen allows the user to quickly get to a particular screen within a functional grouping in the unit. The logic is slightly different than other screens. Figure 3-3 below contains a “Launch Screen Navigation Guide” to assist the user in locating the desired Radio screen. 602-95555-01 Rev A NXE1-20 Digital Radio...
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P r e s s E S C A P E t o r e t u r n t o p r e v i o u s l e v e l s . Figure 3-3. Launch Screen Navigation Guide NXE1-20 Digital Radio 602-95555-01 Rev A...
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Front Panel Operation This page is intentionally blank. 602-95555-01 Rev A NXE1-20 Digital Radio...
Front Panel Operation NXE1 MAIN MENU METER ALARMS/FAULTS QAM RADIO SYSTEM ALARMS - A FAULTS - A ALARMS/FAULTS ALARMS - B SYSTEM FAULTS - B System CARD VIEW POWER SUPPLY Fault(s) Alarm(s) INFO Total Alarms Since METER BASIC CARD SETUP Total Faults Since Reset-1 FACTORY CAL...
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Front Panel Operation NXE1 MAIN MENU METER Select QAM RADIO to open Launch Screens (see text) QAM Radio - Launch Screens QAM RADIO SYSTEM ALARMS/FAULTS QAM RADIO MODEM A / B** QAM RADIO TX A / B** QAM Radio Launch QAM Radio Launch QAM Radio Launch QAM Radio Launch...
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Front Panel Operation NXE1 MAIN MENU SYSTEM CAL System Cal 15V-RFA +5VD EXTERNAL ANALOG METER Factory Calibration BATT +15VA QAM RADIO SYSTEM System 15V-RFA-Prim. Calib Extern A/D 1 Calib ALARMS/FAULTS CARD VIEW Reading 15.00 Reading 15.00 POWER SUPPLY INFO Calibr Val 14.50 Calibr Val 12.00 BASIC CARD SETUP Battery-Prim.
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LEDs on the front panel. 3.4.2 System: Card View Cards Active B.Addr QAMOD A RF TX A RF RX A Cards Active B.Addr MUX 0 CH CD 1 ENCDR 1 Cards Active B.Addr DECDR 1 Function Settings Summary 602-95555-01 Rev A NXE1-20 Digital Radio...
Identification for NMS system SECURITY Indicates access level of security: Lockout No control available User (default) Limited control of parameters Factory Full configure and calibration FIRMWARE V x.xx Revision of front panel screen menu software NXE1-20 Digital Radio 602-95555-01 Rev A...
MUX 0,1,… Mux Module installed and identified Chnl Cd CHC 1,2,… Channel Card installed and identified Note: These are factory settings of installed cards, used to control appropriate displays in the CARD VIEW screens. 602-95555-01 Rev A NXE1-20 Digital Radio...
System RADIO RX QAM Modem The Factory Calibration Screens are documented in Figure 3 -2 (Screen Menu Tree). The user may refer to this diagram when instructed to do so by customer service technicians. NXE1-20 Digital Radio 602-95555-01 Rev A...
Transfer Transfer Tx Transfer Rx Transfer Function Settings Summary TX Transfer Configures the internal logic for transfer panel (TP64) TX control COLD RX Transfer Configures the internal logic for transfer panel (TP64) RX control NXE1-20 Digital Radio 602-95555-01 Rev A...
Logging: All fault and alarm events are logged with the date and time. Alarm screen reset: After viewing the screen, press ENTER to clear all logs entries. If the alarm has been corrected, no new logs will be generated. NXE1-20 Digital Radio 602-95555-01 Rev A...
0.000E +00 Function Settings Summary SLOSS 0.000E +00 Number of times the signal has been lost for more than 10 seconds 0.000E +00 Errored seconds 0.000E +00 Severely errored seconds UNAS 0.000E +00 Unavailable seconds 602-95555-01 Rev A NXE1-20 Digital Radio...
0.00E-00 Pre-FEC (Forward Error Correction) Bit Error Rate since last “ENTER” reset # Bits 0.0000E+00 # of Bits counted since last “ENTER” reset # Errors 0.0000E+00 # of Errors counted since last “ENTER” reset NXE1-20 Digital Radio 602-95555-01 Rev A...
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16-64Q Modulation mode:16QAM, 32QAM, 64QAM BAUD 280.5 K Symbol rate 1535 K Data rate Encoding mode SPCTR NRML Spectrum Normal or Invert FLTR 18 % Nyquist filter INTRL Interleave Depth Continued on next page. 602-95555-01 Rev A NXE1-20 Digital Radio...
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Out) Fvers Xvers Internal is the internal clock of the NXE1; EXT TXC is the External Transmit Clock; EXT RXC is the External Receive Clock; Recovered is the recovered clock from the receiving RF. NXE1-20 Digital Radio 602-95555-01 Rev A...
Indicates phase lock of the 1 UNLOCK 0 – 9.9 VDC LO PLL AFC Voltage 3.8 VDC (nominal) 0 – 99.9% LO relative power level 100% (nominal) XCTR 0 – 99.9% Transmit module’s relative output power level 100% (nominal) 602-95555-01 Rev A NXE1-20 Digital Radio...
QAM Radio TX Control QAM Radio TX Control TX Radiate AUTO Function Settings Summary TX-A Radiate AUTO (default) Transmitter radiating, but folds back output power on high antenna VSWR (REV PWR) Transmitter radiating Transmitter not radiating NXE1-20 Digital Radio 602-95555-01 Rev A...
Front Panel Operation 3-24 3.4.18 QAM Radio RX Control QAM Radio RX Control RX Atten AUTO Function Settings Summary RX-A ATTEN AUTO (default) ON, and is activated on high signal level ON always 602-95555-01 Rev A NXE1-20 Digital Radio...
2,51 2,68 2,102 2,204 SPECTRUM INVERT (default) FILTER Nyquist roll-off factor 15 (default) ENCODING DVB (default) Raw data format TEST NORMAL (default) Test pattern length PRBS15, PRBS23 Loopback CLR (Off) Loopback mode RMT+LOC RPTR NXE1-20 Digital Radio 602-95555-01 Rev A...
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Fvers Xvers Internal is the internal clock of the NXE1-20; EXT TXC is the External Transmit Clock; EXT RXC is the External Receive Clock; Recovered is the recovered clock from the receiving RF. NOTE: See the User Clock Options Conceptual Diagram in Figure 3 -4 below for clarification.
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A DCE coupled together with a DTE enables the signal to be relayed to another DCE. This configuration is called a Repeater. A network can consist of as many Repeaters as necessary. The following sub-sections describe how to configure the NXE1-20 a DCE or as a DTE. 3.4.19.2 NXE1-20 as Data Communications Equipment (DCE) By default, the NXE1-20 is configured as Data Communications Equipment (DCE).
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Front Panel Operation 3-28 C o n f i g u r e d a s D C E To configure the NXE1-20 as a DCE, select the following clock settings in the System menu: QAM Inerface Intfc DCE Trunk...
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3-29 Front Panel Operation To configure the NXE1-20 as a DTE, make the following clock selections in the System menu: QAM Interface Intfc DTE Trunk TX CLOCK Clk Src EXT TXC Clk Ph Norm TX CLK OUT Clk Ph Norm...
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Front Panel Operation 3-30 3.4.19.4 User Clock Options Conceptual Diagram Figure 3-4. User Clock Options Conceptual Diagram 602-95555-01 Rev A NXE1-20 Digital Radio...
LO Side LOW: LO freq is less than carrier freq. HIGH High: LO freq is greater than carrier freq. LO Freq 2370 MHz LO Step 25.0 KHz Programming frequency step size NXE1-20 Digital Radio 602-95555-01 Rev A...
3.5 NMS/CPU PC Configuration Software The NMS/CPU card is configured with a Windows-based PC software package. The hardware is accessed through the serial port on the NMS card back panel. See the manual for Moseley NXE1-20 Configuration Software for more information.
M H z 1. Using the cursors, change to the desired frequency. Press ENTER and the RX will most likely lose AFC LOCK. 2. Navigate the LCD screens to monitor the AFC voltage as follows NXE1-20 Digital Radio 602-95555-01 Rev A...
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Front Panel Operation 3-34 QAM Radio Launch STATUS SYNTH LOCK 3. Ensure that the voltage reads 0.5 to 9.5 +/- .25 VDC. 4. The RX should achieve AFC LOCK and the operation is successful. 602-95555-01 Rev A NXE1-20 Digital Radio...
RECEIVE TIMING (B) RXC_O_B SIGNAL GROUND SIG_GND REQUEST TO SEND CLEAR TO SEND DATA SET READY DATA TERMINAL READY RECEIVE LINE SIGNAL DETECTOR SHIELD CHASSIS GROUND CONN SHELL GND Figure 4-10. Mux Channel – V.35 (DCE) NXE1-20 Digital Radio 602-95555-01 Rev A...
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Appendix Figure 4-12. Trunk to Trunk Cable (Mux-Trunk Null) 602-95555-01 Rev A NXE1-20 Digital Radio...
Primary effects, caused by an obstacle that blocks the direct path, depend on whether it is totally or partially blocking, whether the blocking is in the vertical or the horizontal plane, and the shape and nature of the obstacle. NXE1-20 Digital Radio 602-95555-01 Rev A...
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Fresnel zone radius by the square root of the desired Fresnel zone number. All odd numbered Fresnel zones are additive, and all even numbered Fresnel zones are canceling. 602-95555-01 Rev A NXE1-20 Digital Radio...
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K factors below 1 (earth bulging) are equivalent to ray bending towards the earth's surface. The amount of earth bulge at a given point along the path is given by: NXE1-20 Digital Radio 602-95555-01 Rev A...
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30 feet should be provided. Any path with less than 0.6 first Fresnel zone clearance, but more than 30 feet can generally be considered a grazing path. 602-95555-01 Rev A NXE1-20 Digital Radio...
Recall that the purpose of this tabulation is to determine the fade margin of the proposed radio system. The magnitude of the fade margin is used in subsequent calculations of path availability (up time). NXE1-20 Digital Radio 602-95555-01 Rev A...
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Line 11. Total lines 5 to 10 and enter here. This is the total loss in the proposed system. Line 12. Enter the total gain from line 4. Line 13. Enter the total loss from line 11. 602-95555-01 Rev A NXE1-20 Digital Radio...
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‡ Due to ETSI sensitivity specifications, this is QPSK mode only. Sensitivity is –102 dBm. For other modulation rates relative to 16 QAM, see Table 5-5. Table 5-5.NXE1-20 Modulation rates relative to 16 QAM Modulation Type Threshold Differential Normalized Bandwidth...
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D = path length in miles. f = frequency in GHz. a (terrain factor) = 4 for smooth terrain. = 1 for average terrain. = 1/4 for mountainous, very rough, or very dry terrain. 602-95555-01 Rev A NXE1-20 Digital Radio...
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See Table 5-6 for the relationship between system reliability and outage time. Table 5-6 Relationship Between System Reliability & Outage Time RELIABILITY OUTAGE OUTAGE TIME PER: TIME (%) YEAR MONTH (Avg.) 8760 4380 1752 14.4 99.9 1.44 99.99 0.01 99.999 0.001 0.86 99.9999 0.0001 0.086 NXE1-20 Digital Radio 602-95555-01 Rev A...
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For frequency diversity, transmission is done on two different frequencies. For each case the two received signals will not experience fades at the same time. The exact amount of diversity improvement depends on antenna spacing and frequency spacing. 602-95555-01 Rev A NXE1-20 Digital Radio...
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Total Gain (line 4) Total Loss (line 11) Effective Received Signal (line 12-line 13) ( Minimum Signal Required (BER = 1X10E-4) Fade Margin (line 14-line 15) Terrain Factor Climate Factor Annual Outage min. Reliability NXE1-20 Digital Radio 602-95555-01 Rev A...
Electrostatic Discharge/Electrostatic Damage Forward Error Correction Field effect transistor Frequency Modulation Oscillator FPGA Field Programmable Gate Array Frequency Shift Keying Fractional T1 Integrated circuit International Electrotechnical Commission Intermediate frequency Intermodulation Distortion ISDN Integrated-Services Digital Network 602-95555-01 Rev A NXE1-20 Digital Radio...
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RSSI Received Signal Strength Indicator/Indication Receiver Subsidiary Communications Authorization SCADA Security Control and Data Acquisition Signal-to-Noise Ratio Step Recovery Diode Studio -Transmitter Link Time Division Multiplexing Total harmonic distortion Test Point Transistor-transistor logic Transmitter NXE1-20 Digital Radio 602-95555-01 Rev A...
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