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.
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.
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: n 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.
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: n Log file.
FibeAir 1500 Installation & Operation Manual Chapter 2. Theory of Operation 2.2.5. Power Supplies The power supply features: n Standard Input : -48VDC n DC input range n DC/DC converter. n Reverse polarity protection. n Over-voltage and over-current protection. n 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.
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.
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.
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.
FibeAir 1500 Installation & Operation Manual Chapter 2. Theory of Operation 2.4.6.
