Chapter 3

Using the RADWIN OLBC for RADWIN 5000 HPMP

Continuing with the RADWIN OLBC for RADWIN 5000 HPMP Products:

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Figure 3-1: Link Budget window

 To use the Link Budget Calculator for RADWIN 2000:

1. Choose a band from the drop-down list.

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Figure 3-2: Band selector

2. Choose the HSU type. There are three products from which to chose:

Series

Net throughput (Mbps)

RADWIN 5510 HSU

10

RADWIN 5520 HSU

20

RADWIN 5550 HSU

50

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Figure 3-3: HSU Product Series selection

3. Enter the required channel bandwidth:

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Figure 3-4: Channel bandwidth selection

4. Enter the required Tx power:

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Figure 3-5: Selecting Tx Power

5. Enter the radio details.

Note

The Rate item may be used for calculating the Link Budget under best and worst scenarios. In practice, HBSs are configured for Adaptive rate which may not be disabled.

6. The Rate is chosen from a drop-down list:

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Figure 3-6: Rate selector

The Fade margin is the minimum required for LOS conditions. For degraded link con­ditions, a larger Fade margin should be used.

The EIRP is given in dBm and Watts.

7. If the required range between the two link sites is known, you may enter it directly. Alternatively, you may enter the latitude and longitude of each site in the link, in which case the distance between them will be calculated and displayed.

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Figure 3-7:  Calculation of distance from site coordinates

If for example, you enter:

Site A: 41.1°N lat 75.2°W Long

Site B: 40.8°N lat 75.0°W Long

and press Set,

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the range will be calculated and displayed:

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Note

You can enter latitude and longitude in degree-minute-second format by typing each coordinate as a space-separated triple like this:

30°12”16’ should be entered as 30 12 16.

Alternatively, if you click View, you are offered a visual link profile in a new browser tab. See Chapter 5 for details.

8. Located to the right of the green Coordinates button is a drop-down list of Climactic C Factor values. It is only available if you choose a non-adaptive rate.

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Figure 3-8: Climactic C Factors

For help about what these mean, click the gsc_00010.png button to the right of the list in Figure 3-8.

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Figure 3-9: Climactic C Factor description

In Figure 3-10 we display a map of the world showing C Factor contours:

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Figure 3-10: World map showing C Factor contours

9. After changing the C Factor, click Calculate to see the changed performance esti­mate.

10. Click Calculate to obtain the required performance estimate.

Note

Placing the cursor in any other calculated field will also update the calculated results.

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Figure 3-11: LBC - Results section

The Expected Performance parameters are calculated and displayed:

•         Expected RSS - the expected RSS that the RADWIN Manager shows when the RADWIN 2000, RADWIN 5000 & WinLink 1000 ODUs are optimally aligned

•         Services Type - Ethernet only

•         Ethernet Rate - maximum throughput available for the chosen parameter combina­tion

•         Antenna height for LOS – the minimum antenna height required for line-of-sight operation. It is the sum of the height required for boresight clearance due to the earth’s curvature plus the height required to clear the Fresnel zone

The aggregate throughput and peak rate depend upon the number of time slots (TS) allocated to the HSU. To view the possibilities, click the gsc_0001000001.png button to the right of Ethernet Throughput.

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Figure 3-12: LBC - Aggregate Throughput and Peak Rate by TS allocation

If the expected performance is not suitable for your application, try different parameters and repeat the calculation.