Reference Manual
Table Of Contents
- Preface
- 1. Overview
- Untitled
- 2. Equipment
- 3. Installation
- 4. Basic Radio Programming and Setup
- 4.1. Define the Network Type and the Radio's Role in that Network
- 4.2. Establish Communication with Instrumentation and Computers
- 4.3. Establishing Communication with Other Radios in the Network
- 4.4. Set the Data Transmission Characteristics
- 4.5. Set Radio Passwords
- 4.6. Set the Hop Table Size in the Terminal Interface
- 4.7. Set the Radio to a Single Channel in a Terminal Emulator
- 4.8. Set the Radio to Hop Channels
- 4.9. Edit Frequencies for Multiple Channels
- 5. Configure Point-to-MultiPoint Networks
- 5.1. Point to MultiPoint Network Characteristics
- 5.2. Point-to-MultiPoint Network Quick Start (Terminal Interface)
- 5.3. Overlapping MultiPoint Networks
- 5.4. Establishing Communication with Other Radios in a MultiPoint Network
- 5.5. Routing Communication Through the Network
- 5.6. Setting Other MultiPoint Parameters
- 5.7. Reading Diagnostics in Tool Suite
- 6. Configure Point-to-Point Networks
- 7. View Radio Statistics
- 8. Release Notes
- 9. Additional Radio Information
- Appendix A: Technical Specifications
- Appendix B: RF Board Pin-Out
- Appendix C: RS232 Pin Assignments - DB9
- Appendix D: LRS455 Frequency Table
- Appendix E: Factory Default Settings
- Appendix F: Point-to-MultiPoint Operation LEDs
- Appendix G: Point-to-Point Operation LEDs
- Appendix H: FreeWave Legal Information
- Blank Page
- Blank Page
5. Configure Point-to-MultiPoint Networks
LUM0020CD Rev June-2020 Page 66 of 112 Copyright © 2019FreeWave
This document is subject to change without notice. This document is the property of FreeWave Technologies, Inc.
and contains proprietary information owned by FreeWave. This document cannot be reproduced in whole or in
part by any means without written permission from FreeWave Technologies, Inc.
5.6.5. Master Packet Repeat
Master Packet Repeat
Setting Description
Default Setting 2
Options Any number between 0 and 9
Setup Terminal
Menu
(5) Edit Multipoint Parameters > (1) Master Packet Repeat
Description
In a Point-to-MultiPoint network, Slave radios do not acknowledge transmissions
from the Master.
l If Slave radios did acknowledge all data transmissions, in a large network, the
Master would soon become overwhelmed with acknowledgments from the
Slaves.
l Without acknowledgments, 100% confidence every Slave radio has received
every packet cannot be met.
l To address this issue, change the Master Packet Repeat parameter,
assigning a value between 0 (the packet is transmitted once) to 9 (the packet
is transmitted 10 times).
FREEWAVE Recommends: Use a setting of 1 or 2 in a licensed
network.
For networks with solid RF links, this parameter should be set to a low value
(e.g.,1 or 2).
l If a network has some weak or marginal links it should be set with higher
values.
l If a Slave radio receives a good packet from a Master more than once, it
discards the repeated packets.
l Similarly, after a MultiPoint Repeater receives a good packet from the Master,
it discards any further repeated packets.
l In turn, the Repeater sends the packet out to the next Repeater or Slaves the
number of times corresponding to its own Master Packet Repeat setting.
Notes
l Increasing the Master Packet Repeat setting increases the probability of a
packet getting through, but also increases latency in the network because
each packet from the Master or Repeater is being sent multiple times.
l Therefore, it is important to find the optimal mix between network
robustness, throughput, and latency.
l In general, a setting of 2 to 3 works well for most well designed networks.
l The Master Packet Repeat parameter may be set to 0 if the user software is
capable of, or requires acknowledgment.
l In this case, if the Master sends a packet that the Slave radio does not
receive, the user software controls the retries as needed.
LRS455A-C, LRS455A-CE, LRS455-T
User-Reference Manual
I
I
I I
L__ [ __ _
I I
I I I