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PSM-500/500L/500LT SCPC Satellite Modem
Revision History .............................................................................................................................. viii
Pen and Ink Changes Made to this Manual ............................................................................. viii
Chapter 1 - PSM-500 Modem Description ........................................................................................ 1-1
1.0 Introduction ............................................................................................................................ 1-1
1.0.1 How to Use This Manual .............................................................................................. 1-1
1.0.2 Quick Start for Experienced Modem Users .................................................................. 1-2
1.0.3 What's New - This Modem and This Manual ............................................................... 1-2
1.1 Modem Capabilities ................................................................................................................ 1-2
1.1.1 Modem IF Variations .................................................................................................... 1-2
1.1.2 Modem Feature Set Variations ..................................................................................... 1-3
1.1.3 Applications .................................................................................................................. 1-4
1.1.3.1 SCPC Point-to-Point Links .................................................................................. 1-4
1.1.3.2 SCPC Point to Multi-Point Links in a Broadcast Application .............................. 1-4
1.1.3.3 DAMA (Demand Assigned Multiple Access)....................................................... 1-5
1.1.3.4 TDMA (Time Division Multiple Access) Remote Site Application ....................... 1-5
1.2 Modem Functional Assemblies .............................................................................................. 1-6
Figure 1-2
1.2.1 Modulator ...................................................................................................................... 1-8
1.2.2 Demodulator ................................................................................................................. 1-9
1.2.3 Modem Bit Rate Timing .............................................................................................. 1-10
Figure 1-3 Clock Source Options ....................................................................... 1-11
1.2.4 Control Processor ....................................................................................................... 1-12
1.2.5 Acquisition Processor ................................................................................................. 1-12
1.2.6 Standard Data Interface ............................................................................................. 1-12
1.2.6.1 Data Interface Loop-Back Function .................................................................. 1-13
1.2.6.2 Data Interface BERT Function .......................................................................... 1-13
1.2.6.3 Data Interface 1:1 Redundancy Function ......................................................... 1-13
1.2.7 Standard Framing and IBS Multiplexer ...................................................................... 1-14
1.2.7.1
PSM-500/500L/500LT - Rev. 0.91
Table of Contents
Modem Block Diagram ....................................................................... 1-7
Modem Control Channel (MCC) .................................................................... 1-15
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