Motorola PTP 500 User's Guide download pdf (Page 210)

12 Data Rate Calculations

190

2. The tables in Section 12.3 contain data rates for links of zero range. Use the curves

in Section 12.4 to look up the Throughput Factor that must be applied to adjust the

data rate

s for the actual range of the link.

3. Multiply the data rates by the Throughput Factor to give the throughput capacity of

the link.

NOTE

There is a small difference between the rates for IP and TDM because there is

fragmentation in TDM (for low priority traffic) which causes the throughput to be

reduced buy approximately 1% compared to the IP mode.

12.2.2 Example

Suppose that the link characteristics are:

• Link Symmetry = 1:1

• Link Mode Optimization = TDM

• Modulation Mode = 64QAM 0.83 Dual

• Channel Bandwidth = 10 MHz

• Link Range = 55 km

Applying the calculation procedure:

1. Use Table 21 to look up the data throughput capacity rates (Mbit/s):

Tx = 32.78

Rx = 32.78 Both = 65.56

2. Use Figure 121 to look up the Throughput Fa

ctor for 1:1, TDM and Link Range 55

km. The factor is 0.7.

3. Multiply the rates from Step 2 by the Throughput Factor from Step 3 to give the

throughput capacity of the link (Mbit/s):

Tx = 22.95 Rx = 22.95 Both = 45.89

(If the product is a PTP 500 Lite, divide these figures by 2).

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Motorola PTP 500 User's Guide Page 210