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Libra Satellite Network Libra Satellite Network Reference Guide Nanometrics Inc. Kanata, Ontario Canada © 1999–2004 Nanometrics Inc. All Rights Reserved. Libra Satellite Network Reference Guide The information in this document has been carefully reviewed and is believed to be reliable. Nanometrics, Inc. reserves the right to make changes at any time without notice to improve the reliability and function of the product. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permis- sion of Nanometrics Inc. Nanometrics, Inc. 250 Herzberg Road Kanata, Ontario, Canada K2K 2A1 Tel (613)592-6776 Fax (613)592-5929 Email [email protected] Part number 14824R1 Release date 2004-02-25 Contents Part 1 Getting Started Chapter 1 Introduction . 1 1.1 About Libra VSAT networks . 1 1.2 About this Reference Guide . 2 1.2.1 Related documents . 3 1.2.1.1 As-shipped configuration sheets . 3 1.2.1.2 Nanometrics product manuals . 3 1.3 Network planning forms . 4 1.4 Technical support. 4 Chapter 2 Libra Communications Overview . 1 2.1 Introduction to satellite communications . 1 2.2 Introduction to Libra networks . 10 2.3 Introduction to IP communications . 25 Part 2 Planning the Network Chapter 3 Selecting Network Sites . 35 3.1 Hub sites . 35 3.1.1 Selecting hub sites . 35 3.1.2 Peer hubs . 35 3.1.3 Keeping a record of hub site information . 36 3.2 Remote sites . 36 3.2.1 Selecting remote sites. 36 3.2.2 Keeping a record of remote site information . 36 3.3 Prepare site plans . 37 3.4 Form 1 – Site List . 39 Chapter 4 Configuring Libra IP Connections . 41 4.1 Libra network IP connections . 41 4.2 Configuring your Libra network IP . 43 4.2.1 IP configuration table . 44 4.2.2 IP configuration example . 44 4.3 Form 2 – IP Configuration . 47 Chapter 5 Remote Station Data . 49 5.1 Types of remote station data . 49 5.2 Cygnus communications control . 50 5.3 Cygnus data ports . 50 i Contents 5.3.1 NMXbus ports . 50 5.3.2 Serial ports . 51 5.3.3 External SOH channels. 52 5.4 Instrument and environmental SOH. 52 5.5 Digitiser configuration. 53 5.6 Form 3 – Station Data Configuration . 55 Chapter 6 Multiplexing Network Data – TDMA . 59 6.1 Overview of TDMA . 59 6.2 TDMA in Libra networks. 60 6.2.1 Latency: Selecting the frame duration . 61 6.2.2 Data bandwidth: Assigning slot capacities . 62 6.2.2.1 Determining the baseline seismic data rate. 62 6.2.2.2 Choosing the TDMA data throughput . 62 6.2.2.3 Allocating bandwidth in smaller networks . 63 6.2.3 Epoch duration . 64 6.2.4 Slot guard time . 65 6.2.5 Lock duration . 65 6.2.6 Security keys. 65 6.3 Configuring your Libra network TDMA . 65 6.4 Form 4 – TDMA Configuration . 67 Chapter 7 Interpreting Your Satellite Lease . 69 7.1 What is a satellite lease? . 69 7.1.1 The satellite service . 69 7.1.2 Responsibilities of the satellite provider . 70 7.1.3 Responsibilities of the network operator . 70 7.1.4 Cost of the satellite services . 71 7.2 Applying the satellite lease information to your network . 71 7.2.1 Network name. 72 7.2.2 Satellite name . 72 7.2.3 Authorization number . 73 7.2.4 Transponder . 73 7.2.5 Satellite longitude . 73 7.2.6 Uplink polarization. 73 7.2.7 Satellite local oscillator . 73 7.2.8 Satellite local oscillator offset . ..
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