Ceragon Networks GNT-FA1500-28 Point-to-Point digital radio User Manual FibeAir cover
Ceragon Networks Ltd. Point-to-Point digital radio FibeAir cover
Contents
- 1. chapter 4
- 2. chapter 5
- 3. chapter 2
- 4. chapter 3
chapter 2
2.1. System Block Diagram This chapter presents FibeAir 1500 basic principles of operation. The FibeAir 1500 design concept is based on universal radio architecture. A radio link consists of two FibeAir 1500 terminals. Each terminal includes three major LRU’s, IDU, ODU and the Antenna. A single cable, carrying communications and DC power, interconnects the IDU with the ODU. Figure 2-1 presents FibeAir 1500 main blocks and modules. Figure 2-1 FibeAir 1500 System Block Diagram Revision 2.0 System Block Diagram 2-1 Chapter 2. Theory of Operation 2.2. FibeAir 1500 Installation & Operation Manual In Door Unit (IDU) The IDU is a compact, 17” wide, 1U-high unit, mount compatible for both ETSI and ANSI standard racks. The IDU modulates/demodulates the 155Mbps Sonet/SDH payloads, manages local and remote units, provides I/O line alarms, and provides interfaces for 1.544/2.048 Mbps Wayside channel, 64Kbps User channel and 64Kbps Order Wire channel. The IDU also interfaces a Local Maintenance Terminal or Network Management System. In addition, status alarms and indicators are provided on the front panel. The IDU major modules: Multiplexer Modem Manager Card Cable Interface Power Supply 2.2.1. Multiplexer The Mux module functions as a Sonet/SDH Regenerator. On the line side it interfaces the OC-3/STM-1 stream, and on the radio side the Modem module. As a regenerator, the MUX either terminates or regenerates the OC-3/STM-1 RSOH. In one direction, the OC-3/STM-1 stream, interfacing through the MUX’s Rx line input terminates and the resulting stream is transmitted to the Modulator in the Modem module. In the opposite direction, the stream coming from the Modem’s Demodulator, undergoes OC-3/STM-1 Regeneration in the MUX, and transmitted through the MUX’s Tx line output. In addition, the MUX module uses the OC-3/STM-1 SOH bytes to support other services: 1.544/2.048 Mbps Wayside channel and management, 64 Kbps User Channel and Order Wire channel. The MUX module may be configured via software for transparency of most of the SOH bytes for maximum system transparency and non-intervention, at the cost of reduced functionality and services. The multiplexer module enables to integrate different interfaces and services into the SDH payload to converge Datacom and Telecom applications. 2-2 In Door Unit (IDU) Revision 2.0 FibeAir 1500 Installation & Operation Manual Chapter 2. Theory of Operation 2.2.2. MODEM The FibeAir 1500 is equipped with a 16-states QAM Modem. The modem delivers a 155 Mb/s payload in 50/56 MHz channel bandwidth in compliance with FCC/ETSI standards. The Modem is equipped with Digital Signal Processing functions as follows: Digital IF - I/Q modulator/demodulator whose functions are: ⇒Conversion of the modulated signal to/from the IF frequency. ⇒Automatic level equalization on the signal from ODU. ⇒Protection against overloads. Timing recovery techniques employing digital tracking loop. FEC ensures unfaded BER lower than 10-13. The following figure illustrates a measured 16 QAM constellation. Figure 2-2 16 QAM Constellation Revision 2.0 In Door Unit (IDU) 2-3 Chapter 2. Theory of Operation FibeAir 1500 Installation & Operation Manual 2.2.3. Manager Module The Manager module controls and manages all system’s modules, local and remote units. The Manager module also supports the user interface through Ethernet or PPP/SLIP to the management station, and an ASCII terminal port. A local or dumb terminal can be used for basic configuration and performance monitoring. Other features include: Log file. Remote software and firmware download (upgrades can be downloaded from local to remote). Performance monitoring. 2.2.4. Cable Interfaces A single coaxial cable connects the IDU to the ODU. This cable carries the following signals: Transmit and receive modulated signals. Transmit and receive control data and communications between the IDU manager and the ODU controller. DC power from the IDU to the ODU. The system automatically issues an alarm if the cable is disconnected and provides protection against shorts. Furthermore, there is no need to measure and define the length and type of cable used since the system automatically compensates cable parameters. The following figure illustrates the signal direction through the coaxial cable. -48 VDC ODU TO IDU (CONTROL) IDU TO ODU (CONTROL) TX (PAYLOAD 155M) RX (PAYLOAD 155M) Figure 2-3 Signal Direction Through the Coaxial Cable 2-4 In Door Unit (IDU) Revision 2.0 FibeAir 1500 Installation & Operation Manual Chapter 2. Theory of Operation 2.2.5. Power Supplies The power supply features: Standard Input : -48VDC DC input range DC/DC converter. Reverse polarity protection. Over-voltage and over-current protection. Detection of IDU-ODU cable alarms (i.e. cable open, cable short). : -40.5VDC to –72VDC The ODU receives its DC power from the IDU. The PWR LED on the front panel of the IDU continuously lights to indicate the existence of input voltage. 2.3. Out Door Unit (ODU) The ODU is designed to be fastened to the antenna using four latches. The antenna is mounted on a standard mounting pole. The ODU is enclosed in a compact, weather proof enclosure and connects to the IDU via a single coaxial cable that can extend up to 300m (1000 ft). The ODU major modules: T/R Module – A high sensitivity RF circuitry with full band frequency tuning range. Controller – Controls the ODU and provides ODU status signals, and accurate received signal level (RSL) reading (in dBm). Cable Combiner – Detailed in paragraph 2.2.4. Power Supply - Detailed in paragraph 2.2.5. Latches Figure 2-4 ODU Mounted on the Antenna Revision 2.0 Out Door Unit (ODU) 2-5 Chapter 2. Theory of Operation 2.4. FibeAir 1500 Installation & Operation Manual System Specifications 2.4.1. General 18 GHz 23 GHz 26 GHz 28 GHz 38 GHz Standards FCC/ETSI FCC/ETSI ETSI FCC/ETSI/ Canada FCC/ETSI Operating frequency range 17.7 - 19.7 GHz 21.2 - 23.6 GHz 24.5 - 26.5 GHz 27.5 - 28.35 GHz / 27.5 - 29.5GHz/ 27.35 - 28.35 GHz 37 - 38.4, 38.6-40 GHz/ 37-39.5 GHz Tx/Rx spacing 1560/1010 MHz 1200/1008 MHz 1008 MHz 450/1008/500 MHz 700/1260 MHz RF channel spacing 50/55/80 MHz 50/56 MHz 56 MHz 50/56 MHz 50/56 Mhz Capacity OC-3/STM-1 or equivalent Modulation type 16 QAM Frequency stability +/- 0.0005% Frequency source Synthesizer RF channel selection Via NMS System configurations Non-Protected (1+0), Protected (1+1) 2.4.2. Frequency Frequency Supported Standards 18 GHz EN 300 430, CEPT T/R12-03, ITU-R F.595-5, FCC parts 15, 101 (formerly parts 21, 94) 23 GHz EN 300 198, BAPT 211 ZV 02/23, MPT 1409, CEPT T/R13-02, ITU-R REC. F.637-2, FCC parts 15,101 (formerly parts 21,94) 26 GHz EN 300 431, BAPT 211 ZV 11/26, MPT 1420, CEPT T/R13-02, ITU-R REC.748-2 28 GHz EN 300 431, CEPT T/R13-02, ITU-R REC.748, FCC parts 15, 101 (formerly parts 21, 94) 38 GHz EN 300 197, BAPT 211 ZV 12/38, MPT 1714, CEPT T/R12-01, ITU-R REC.749, FCC parts 15,101 (formerly parts 21,94), FCC: NZ4 GNT-FA-1500-38 2-6 System Specifications Revision 2.0 FibeAir 1500 Installation & Operation Manual Chapter 2. Theory of Operation 2.4.3. Radio 18 GHz 23 GHz 26 GHz 28 GHz 38 GHz Transmitted Power 22 dBm 20 dBm 20 dBm 20 dBm 15 dBm Tx Attenuation Range 30 dB 30 dB 30 dB 30 dB 25 dB Receiver Sensitivity (BER=10-6 ) -73 dBm -72 dBm -72 dBm - 72 dBm -70 dBm Receiver Overload (BER=10-6 ) Better than –15 dBm Unfaded BER Better than 10-13 2.4.4. Antenna 18 GHz 23 GHz 26 GHz 28 GHz 38 GHz 1 Ft Gain 33.5 dBi 35 dBi 36 dBi 36.6 dBi 39 dBi 2 Ft Gain 38.5 dBi 40 dBi 41 dBi 41.5 dBi 44 dBi 3 Ft Gain 42 dBi 43.5 dBi 44.5 dBi --------- --------- 4/6 Ft Gain 44.5/48 dBi 46/49.5 dBi 47 dBi --------- --------- Polarization Vertical or Horizontal Standard Mounting OD Pole 51mm – 114mm/2.0”-4.5” (Subject to vendor and antenna size) High Performance ETSI class 2, 3 Revision 2.0 System Specifications 2-7 Chapter 2. Theory of Operation FibeAir 1500 Installation & Operation Manual 2.4.5. Payload 155.52 Mb/s Main Channel Payload Types Sonet/SDH: OC-3/sts-3, OC-3c/STS-3c, SDH: OC-3/STM-1, ATM over Sonet/SDH, IP over Sonet/SDH, 3xDS3/ES3, 3xE3 Physical Interfaces Electrical: CMI, UTP, STP, optical: single-mode, multi-mode, long-haul and short-haul Compatible Standards ITU-T G.703, G.707, G.783, G.823, G.957, G.958, ITU-T I.432, ATM Forum, ETSI ETS 300 147, ETS 300 417, ANSI T1.105, ANSI T1.102-1993, Bellcore GR-253-core, TR-NWT-000499 1544/2048 Kb/s Wayside Channel Available Interfaces T1/E1, Ethernet bridge 10Base-T, V.35, X21, RS-530 or V.36 64 Kb/s User Channel Available Interfaces 24 (RS-232, DB9, 64 Kb/s synchronous, 19.2 Kb/s asynchronous), or Ethernet bridge 10Base-T Service Channel Engineering Order Wire ADM CVSD audio channel (64 Kb/s) Note: All interfaces for Main and Wayside Channels are available via modular, plug-in interface units. * 3xDS3/ES3 model is provided with a V.24 (RS232, DB9) user channel 2-8 System Specifications Revision 2.0 FibeAir 1500 Installation & Operation Manual Chapter 2. Theory of Operation 2.4.6. Network Management, Diagnostics, Status and Alarms Type SNMP, in compliance with RFC 1213, RFC 1595 (Sonet MIB) Local or Remote NMS Station GiganetViewTM with advanced GUI for Windows 95/98/NTTM or UNIXTM , integrated with HP OpenViewTM NMS Interface Ethernet bridge 10Base-T, RS-232 (PPP, SLIP) Local Configuration and Monitoring Standard ASCII terminal, serial RS-232 Cascaded Topology Internal IP routing allows cascaded link topology TMN Giganet NMS functions are in accordance with ITU-T recommendations for TMN. Interconnection to TMN is available via Q3 interface upon specific requirement External Alarms 8 Inputs, TTL-level or contact closure to ground, 5 Outputs, Form C contacts, software configurable RSL Indication Accurate power reading (dBm) available at IDU, ODU and NMS Performance Monitoring Integral with an on board memory per ITU-TG.826 2.4.7. Environmental Operating Temperature (Guaranteed Performance) ODU: -35oC to 55oC IDU: -5oC to 45oC Relative Humidity ODU: up to 100% (all weather operation) IDU: up to 95% (non-condensing) Altitude Up to 4,500m (15,000 ft) 2.4.8. Power Standard Input -48V DC DC Input range -40.5 to –72V DC Optional Input AC 2.4.9. Mechanical Dimensions ODU 25 cm diameter x 20/23 cm depth (10” diameter x 8” depth) 8.45 kg weight IDU 4.3 cm height x 43.2 cm width x 24.0 cm depth (1.7” x 17” x 9.4”) 2.7 kg weight IDU – ODU Coaxial Cable Revision 2.0 RG-223 (100 m/300 ft), Belden 9914/RG-8 (300 m/1000 ft) or equivalent, N-type connectors (male) System Specifications 2-9
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