Radio Outdoor Unit

I will explain general about radio outdoor unit, the odu houses the interface towards the IDU on one side, and towards the antenna flange on the other.

The odu shifts the incoming QAM-modulated carrier to RF frequency through a double conversion. The opposite occurs at the receive side, when the IF-converted carrier is sent to the IDU demodulator.

Antenna coupling in 1+1 system is done through abalanced or unbalanced hybrid.

Radio Indoor unit (IDU) overview

The IDu is available in the following hardware versions:

• 1 rack unit compact IDU, 1+0 configuration, 2/4/8xE1
• 1 rack unit compact IDU, 1+0 configuration, 2/4/8/16xE1
• 1 rack unit compact IDU, 1+1 configuration, 2/4/8xE1
• 1 rack unit compact IDU, 1+1 configuration, 2/4/8/16xE1

Ethernet module V12252 can be housed inside IDU, as option, as ethernet traffic. Compact IDUs consist of a single circuit board plugged into a wired shelf. Line interfaces house tributary connections and, through a multiplexing/demultiplexing and bit insertion/extraction process, suplly/receive the agregate signal to/from the modulator/demodulator.

Line interface carry out the digital processing for the QAM modulator and, in 1+1 configuration, duplicate the main signals on the transmission side and perform the change over on the receive side. Interface to wards the ODU house the cable interface for bidirectional communication between ODU and IDU, and implement the IF section of the modulator-demodulator.

IDU power supply units process battery voltage and supply power to IDU and ODU circuits. The controller section of the radio houses service channel interfaces, store IDU firmware, interfaces management system though dedicated supervision ports, and routes external and internal alarms to relay contacs. 

Radio system overview radio system

PDH radio series for low-to-medium transmission capacities in frequency bands from 7 to 38 Ghz.

Different hardware versions offer a range of tributaries traffic from 2xE1 to 16xE1, with or without ethernet traffic, on 4 and 16QAM modulation, with capacity up to 64 Mbit/s.

Reduced cost, high reliability, compact size, light weight and full programmability are the key features of this radio series.

Aplication
main applications are:

• radio communication between GSM cells
• radio links for voice and data transmission
• spur routes for high capacity radio system
• emergency links
• ethernet traffic in point to point communication 

System Architecture

The radio equipment consist of two separate units:

• the indoor unit (IDU) that hauses tributary interface, ethernet ports modem and controller unit
• the outdoor unit (ODU) that converts IF signal into RF signal