Cambium Networks cnReach N500 Handleiding (253 Pagina's)

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cnReach N500 User Guide System Configuration

phn-4980_001v004 August 2019)

2-31

Here is one example of the table showing how to determine the appropriate value. Make sure to

use the correct table as show in Chapter 3: Technical Reference.

ISM – Minimum Packet Sizes with Multi-Speed Multi-Point

The following table charts the smallest “Max Payload Bytes” setting when using multiple ISM End Point

Transmit Rates.

Fastest Modulation

MSK 2FSK BPSK QPSK 8PSK 16QAM 16PSK 32QAM

Kbps

57

114

153

22

663

884

1768

2651

3535

4419

Slowest Modulation

MSK

57

64

165

229

35

1111

1492

114

64

95

15

530

718

1459

153

64

11

396

539

1101

229

64

260

357

737

1118

1498

2FSK

663

64

97

217

337

458

578

BPSK

884

64

152

240

328

416

QPSK

1768

64

108

152

196

8PSK

2651

64

94

122

16QAM

3535

64

86

16PSK

3535

64

86

32QAM

4419

64

1. Find the fastest desired modulation at the top of the chart.

–

2. Find the slowest desired modulation on the left hand side of the chart.

–

3.

The box where the column and the row meet is the smallest packet size that must be used for

both Access Point and End Point Max Payload Bytes to establish a connection.

–

4. Multiple modulations can be enabled as long as the smallest packet size corresponds to the

value where the fastest and slowest modulations meet.

Examples

Example 1: ISM

Fastest Modulation: 884Kbps (BPSK), Slowest Modulation 229Kbps (MSK).

Max Payload Bytes must be configured to 357 Bytes or larger.

Example 2: ISM

Modulations enabled: 2651 Kbps (8PSK), 884 Kbps (BPSK), 663 Kbps (2FSK).

Max Payload Bytes must be configured to 337 Bytes or larger.

Example 3: ISM

Fastest Modulation 2651 Kbps (8PSK), Slowest Modulation 153 Kbps (MSK).

This combination of modulation modes will not work.

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