HERALD Lab #8

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ITU Objectives

(Herald Professional only)

HERALD Functions

Exercise 8.1 : Set basic parameters

Exercise 8.2 : International section

Exercise 8.3 : Long-haul section

Exercise 8.4 : Access section

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HERALD Functions

The following Herald functions are related to ITU Performance Objectives :

· The basic parameters useful to define performance objectives are specified in the "ITU-T / ITU-R Objectives - General settings" dialog (Customize / ITU Objective Parameters command). Such parameters are common to all the hops / sections in a given project.

· The "Section Data" dialog (Define / Sections) allows to define/modify Radio Section data. The user selects which are the applicable Recs and the link type relevant in that case (national / international; long-haul / short-haul / access; etc.). The SESR and Unavailability objectives are shown

· In the Section Report, the predicted Multipath Outage and Rain Unavailability results are shown for the selected Radio Section and should be compared with SESR and Unavailability objectives, respectively. The paragraph "Comparison with ITU-T / ITU-R Objectives " indicates which are the assumptions made to compute performance objectives.

Exercise 8.1 : Set basic parameters

Run Herald and open the "Object1_Sample.hpf" project.

· Execute the Customize / ITU Objective Parameters command to display the "Settings for ITU Objectives" dialog. Click the “Use Default Settings” button, to be sure that all the parameters are initialized with default values.

· Modify some defaults as:

A1 (Block allowance to Long-haul sections) = 1%

C (Block allowance to Access sections) = 8.5%

Exercise 8.2 : International section

Run Herald and open the "Object2_Sample.hpf" project (this is the same project as revised in the previous exercise).

· Execute the Define / Sections command; the "Radio Sections" dialog is displayed, click the Create button (the "New Section Data" dialog will be displayed)

· In the "New Section Data" dialog, select the ALPHA-BETA, BETA-CHARLIE, and CHARLIE-ECHO hops to define a new radio section, named "NorthSouth".

· In the "Section Data" dialog, check the "Set Performance Objectives" checkbox and select options to compute performance objectives, taking account that:

· "NorthSouth" is a SDH radio section ( Tip: use G.828);

· "NorthSouth" delivers international traffic to the terminating country;

· It is estimated that 75% of total unavailability can be allocated to propagation events.

· Check the Unavailability and Error Rate objectives computed under the above assumptions.

· Close the "Section Data" dialog. In the "Radio Sections" dialog, click the Report button to display the Radio Section report. Comment on the displayed results.

Tip : Compare predicted Multipath Outage with Error rate objectives and predicted Rain Unavailability with Unavailability (propagation) objectives..

Exercise 8.3 : Long-haul section

Run Herald and open the "Object2_Sample.hpf" project.

· As in the previous exercise, define a Radio Section, named "MultiRegion", with hops ALPHA-BETA and BETA-CHARLIE.

· In the "Section Data" dialog, check the "Set Performance Objectives" checkbox and select options to compute performance objectives, taking account that:

· It is required to test performance objectives at the channel level (below primary rate) ( Tip: use G.821);

· "MultiRegion" deliver traffic from an International Gateway to a Primary Center ( Tip: High grade link);

· It is estimated that 50% of total unavailability can be allocated to propagation events.

· As in the previous exercise, check computed objectives in the "Section Data" dialog. Then display the Section Report and take note of the displayed results.

Exercise 8.4 : Access section

As in the previous exercise, run Herald and open the "Object2_Sample.hpf" project.

· Define a Radio Section, named "Local", with only one hop (BETA-DELTA).

· In the "Section Data" dialog, check the "Set Performance Objectives" checkbox and select options to compute performance objectives, taking account that:

· "Local" is a SDH radio section ( Tip: use G.828);

· "Local" is in the National / Access portion of the network;

· It is estimated that 50% of total unavailability can be allocated to propagation events.

· As in the previous exercise, check computed objectives in the "Section Data" dialog. Then display the Section Report and take note of the displayed results.

End of HERALD Lab#8

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