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

First aid for electrical shock

Do not touch the patient with bare hands until the circuit has been opened. Open the circuit by switching off the line switches. If that is not possible protect yourshelf with dry material and free the patient from the conductor .

1. Artificial respiration

It is important to start mounth resustication at once and to call a doctor immediately. Suggested procedure for mouth to mouth resustication methode  is described below :

- Lay the patient on his back with his arm parallel to the body. If the patient is laying on an inclined plane, make sure that his stomach is slightly lower than his chest. Open the patient mouth and check that there is no foreign mater in mouth.

- Kneel beside the patient level with his head. Put an hand under the patient's head and one under his neck. Lift the patient's head and let it recline backwards as far as possible.

- Shift the hand from the patient's neck to his chin and his mouth, the index along his jawbone , and keep the other fingers closed together. While performing these operations take a good supply of oxygen by taking deep breaths with your mouth open.

- With your thumb between the patient's chin and mouth keep his lips together and blow into his nasal cavities.

- While performing this operations observe if the patient's chest rises. If not it is possible that his nose is blocked : in that case open the patient's mouth as much as possible by pressing on his chin with your hand, place your lips around his mouth and blow in to his oral cavity. Observe if the patient's chest heaves. This second method can be used instead of the first even when the patient's nose is not obstructed, provided his nose is kept closed by pressing the nostrils together using the hand you were holding his head with. The patient's head must be kept sloping backwards as much as possible .

- Start with ten rapid expirations, hence continue at rate of twelve or fifteen expirarations per minute. Go on like this until the patient has regained conscious-ness, or until a doctor has ascertained his death.

2. Treatment of burns

The treatment  should be used after the patient has regained consciousness. It can also be employed while artificial respiration is being applied ( in this case there should be at least two persons present).
Warning : 
- Do not attempt to remove cloting from burnt sections
- Apply dry gauze on the burns

The main part of the microwave radio

A pair of point to point microwave radio (PTP) in general have three main sections :

1. Indoor Unit

In the indoor unit has multiple interfaces that have different functions such us DC power input, tributary E1, ethernet port, alarms, console management, coaxial cable interface.

2. Outdoor Unit

In the outdoor unit has several interfaces, among other coaxial cable interface, AGC port, holes for parabolic antennas.

3. Cabel connection between indoor unit and outdoor unit

Used coaxial cable 8 mm, the maximum length of cable that can be used depending on the capacity and modulation. the higher of modulation will be smaller maximum length of cable. 

Why use a radio microwave

If we are the company's data network service provider who want a good service with minimal investment, is not wrong if using microwave radios as lastmile.

Data service is on offer varies widely ranging from 64 Kbps to 300 Mbps, certainly with greater bandwith required will be greater the cost.

The advantage of using radio microwave among others :

- Speed of installation.

- A cheap investment.

- Reliable.

- If not having a license withdrawal of fiber optic cable or copper cable.

So very provitable if you use a microwave radio as lastmile.