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Contents Overview

Importing the Data

Configuring the Reliability Options

Configuring the Profile

Configuring the Rain Region

Configuring the Equipment

Configuring the Branching Network

Configuring the Joint Loss

Configuring the Antenna

Viewing the Performance Index


Overview Purpose

1. Masters the configuration method of the modules in the Pathloss Worksheets.

2. Completes the analysis of a single hop of microwave link.

Studied Case

Project area: a country in Africa, which is located at the eastern longitude and southern latitude, Southern

Hemisphere

Basic information the single-hop link:

High-accuracy electronic map:

Electronic map in the SRTM format

Site1-Site2


Contents Overview

Importing the Data










Importing the Data

Processing the Data:

Importing the Electronic Map in the SRTM Format

1. Run the Pathloss software, and choose Configure > Terrain

Database. In the displayed dialog box, select SRTM under

Primary.

2. Click Setup Primary, and the SRTM window is displayed.

Choose Files > BIL-HDR-BLW to select the proper map (in the

format of *.hgt).

Site1-Site2.csv


Importing the Data

Importing the Data in the Format of CSV Choose Module > Network > Site Data > Site List > Import > Site Text

File from the menu of the Pathloss, and the Import Text File dialog box is displayed.


Importing the Data

After you determine the related items in the Import Text File dialog box, click Import. Select the data to be imported (final data format: *.CSV), click Open, and then click Import. Click Close when the process is complete.


Importing the Data Choose Files > Save (in the format of *.gr4) > Site Data > Create Background.

Site1

Site2


Importing the Data Drag the mouse to connect Site1 and Site2. Click on the connection line, and select

Summary. Based on the data in the Calculated Distance (km), enter the proper value in Frequency. This hop of link adopts the central frequency point 12996 MHz of the 13 GHz frequency band.


Importing the Data Choose Module > Terrain Data > Operations > Generate Profile.


Importing the Data Click Generate in the Generate Profile dialog box, and then click Close. Double-

click the blank area under Structure, and then select Range of Structures. Set the height of the structure (in the example, a tree of 15 meters).


Importing the Data Choose Module > Antenna Heights, and then click .


Contents Overview

Importing the Data










Configuring the Reliability Options Choose Module > Worksheets > Operations > Reliability Options.


Configuring the Reliability OptionsA. Reliability Method Vigants - Barnett: Currently, it is commonly used. The required parameters include terrain

factor or climate factor, and terrain roughness. ITU-R P530-6: Recommendations of the International Telecommunication Union–Radio

Communication Sector The required parameters include channel inclination degree, angle of incidence, and earth

coefficient. ITU-R P530-7/8: Recommendations of the International Telecommunication Union–Radio

Communication Sector The required parameters include channel inclination degree and earth coefficient. KQ factor: KQ standard The required parameters include KQ factor, distance exponent, and frequency exponent. KQ*S^(-1.3): modified mode of the KQ standard The required parameters include KQ factor, distance exponent, frequency exponent, and

terrain roughness. KQ Frequency Exponent: modified KQ frequency exponentIt is set to 1.2 in the system by default. KQ Distance Exponent: modified KQ distance exponentIt is set to 3.5 in the system by default.

ITU-R P530-9: Recommendations of the International Telecommunication Union–Radio Communication Sector

Cochannel operation: Select this item when calculating the XPIC in the SDH microwave to prevent the interference of the co-frequency.



B. Calculation Method Total Annual Time Below Level: Currently, it is commonly used. ITU-T G.821 SESR – Unavailability: Recommendations of the International

Telecommunication Union-Telecommunication Standardization Sector You can select this item when the PDH microwave is adopted. ITU-T G.826 SESR,BBER,ESR, Unavailability: You can select this item when the

SDH microwave is adopted. Description of this option is as follows: SESR (Severely Errored Seconds Rate): It refers to the ratio of the seconds when

the BER exceeds 1x10–3 and the errored seconds to total seconds in one second. It is a short-time and high-BER index. The bit errors in this condition are generally caused by the deep fading in the radio transmission.

BBER (Background Block Error Rate): It refers to the ratio of background block errors (BBE) to total blocks in a fixed measurement interval with the SES and unavailable time deducted.

ESR (Errored Seconds Ratio): It refers to the ratio of errored seconds to total seconds in one second. This index is specified for the data transmission, and is determined by the performance improvement of the equipment.


Configuring the Reliability OptionsC. Regional Standards North America – dispersive fade margin: Currently, it is commonly used. If you

select this item, parameters of dispersive fade margin and the dispersive fade occurrence factor are required. The two parameters are automatically imported by the system from the equipment files.

ITU-R P.530 strict – equipment signature: Recommendations of the International Telecommunication Union-Radio Communication Sector for the signals of the strict equipment The required parameters for this item are automatically imported by the system form the equipment files. When you select this item, the improvement effect of the space division and frequency division are calculated as specified in ITU-R P.530-8.

D. Time percentages 99.9999%: Currently, it is commonly used, which indicates the system availability

ratio. 0.0001%: system unavailability ratio E. Type PDH: Select this item according to the actual condition. SDH: Select this item according to the actual condition.F. Treat multi-path as SES and unavailability: Currently, it is commonly used. It indicates calculating

the SES and system unavailability. SES only: It indicates calculating the SES only.


Configuring the Reliability OptionsIn the example, we assume the following condition: The microwave equipment adopts the OptiX RTN 600, and the KQ factor is calculated when the B-Type Profile (inland hilly area, B = 1, C = 1.8, KQ = 2.75E-5) and Rain Region P (145 mm/h) are selected.


Contents Overview

Importing the Data










Configuring the Profile Click on any position in the following figure, and the Path Profile Data dialog box is displayed.

Enter the following parameters: Field margin (dB): This parameter is a security related parameter in the actual installation and

commissioning. The typical value increases incrementally by 1 dB. KQ factor: Enter 2.75E-05 (in the case of B-Type Profile).


Contents Overview

Importing the Data










Configuring the Rain Region Click , and select ITU-R P.530-7/8 in the displayed Rain dialog box. Click Load

Rain File to select the proper rain file (from the rain files of the entire globe). In the example, select the ITU_P.RAI file. Click Open, and then click Close in the Rain dialog box.


Contents Overview

Importing the Data










Configuring the Equipment Click , and the Radio Equipment window is displayed. Click Code Index, and the Radio Code

Index dialog box is displayed. Click New Index, and choose EQUIPMENT > mrs > HW > RTN 600 MRS > 13 GHz (in the example, the OptiX RTN 600 with a capacity of 8xE1 that operates at 13 GHz and adopts QPSK is used). Select Use 10-3 parameters in the Radio Code Index dialog box (select Use 10-3 parameters when the PDH microwave is used, and select Use 10-6 parameters when the SDH microwave is used). Select the proper equipment, and then click Both. After the process is complete, click Close.


Contents Overview

Importing the Data










Configuring the Branching Network If the 1+0 protection mode is adopted, configuring the branching network is not required. If the

1+1 hot backup or 2+0 protection mode is adopted, the hybrid coupler (for the uni-polarized microwave antenna) is required. In this case, you need to configure the branching network, that is, you need to consider the loss of the hybrid coupler.

Click , and the Branching Network TR - TR window is displayed. Enter the value of loss in Circ. Branching loss (dB).


Contents Overview

Importing the Data










Configuring the Joint Loss Click , and the Transmission Lines TR – TR (36.1 – 37.8) window is displayed.

Enter 0.50 dB of the connector loss at the transmit end and at the receive end. For the trunk radio equipment, the RF loss is required to be configured.

The joint loss of the split-mount radio equipment considers the connector loss only.


Configuring the Joint LossThe joint loss of the trunk radio equipment includes the connector loss and the RF loss.


Contents Overview

Importing the Data










Configuring the Antenna Click , and the Antennas TR – TR window is displayed. Click Code Index, and the Antenna

Code Index dialog box is displayed. Click New Index, and choose EQUIPMNT > mas > Putian (in the example, as the microwave antenna of Putian is selected, an extra loss of 0.5 dB should be added to the random loss of each site). Click OK. Select WTG0.6-127D (the proper antenna), and click Both. After the process is complete, click Close.


Contents Overview

Importing the Data










Viewing the Performance Index The system reliability index is assumed to be 99.995% for 1+0 PDH, 99.998% for 1+1 PDH,

and 99.999% for SDH. If the index is changed, the transmission distance is directly affected. The normal receive level and flat fade margin vary in a great range. If the user emphasizes or

defines a specific range, the transmission distance is directly affected. If the two parameters are not required, modify the transmission distance. If the two parameters are not required, modify the transmission distance.


Viewing the Performance Index Choose Report > Full Report > Files, and the Save Report as RFT File dialog box is displayed. Enter

the file name Site1-Site2.rtf, and then click Save.

Site1-Site2

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Transmission Analysis of a Single Hop for Microwave Link

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Transcript of Transmission Analysis of a Single Hop for Microwave Link