User's Manual

16 Data Rate Calculations
294
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.
16.1.2 Example
Suppo
se that the link characteristics are:
• Product variant = PTP 600 Lite
• Link Symmetry = 1:1
• Link Mode Optimization = TDM
• Modulation Mode = 64QAM 0.92 Dual
• Channel Bandwidth = 10 MHz
• Link Range = 60 km
Applying the calculation procedure:
1. Use Table 49 to look up the data throughput capacity rates:
o
Tx = 41.41 Mbits/s
o Rx = 41.41 Mbits/s
o Both = 82.81 Mbits/s
2. Divide these rates by 2 to give PTP 600 Lite rates:
o Tx = 20.70 Mbits/s
o Rx = 20.70 Mbits/s
o Both = 41.40 Mbits/s
3. Use Figure 176 to look up the Throughput Facto
r for 1:1, TDM and Link Range 60 km.
The factor is 0.86.
4. Multiply the rates from Step 2 by the Throughput Factor from Step 3 to give the
throughput capacity of the link:
o Tx = 17.80 Mbits/s
o Rx = 17.80 Mbits/s
o Both = 35.60 Mbits/s