Comtech EF Data CDM-625 - Page 19

CDM-625 Advanced Satellite Modem Revision 13
Table of Contents MN-CDM625
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16.6 Ethernet Redundancy ...................................................................................................... 16–14
16.7 Advanced Network Timing .............................................................................................. 16–15
16.7.1 Overview ............................................................................................................................................... 16–15
16.7.2 SNTP (Simple Network Time Protocol) .............................................................................................. 16–15
16.7.3 PTP (Precision Time Protocol)............................................................................................................. 16–15
CHAPTER 17. ADAPTIVE CODING AND MODULATION (ACM) ..................................... 17–1
17.1 Introduction ..................................................................................................................... 17–1
17.2 Background ...................................................................................................................... 17–2
17.3 Requirements for ACM ...................................................................................................... 17–3
17.4 An Existing Satellite ACM Scheme ...................................................................................... 17–5
17.5 Disadvantages of DVB-S2 .................................................................................................. 17–5
17.6 VersaFEC ACM .................................................................................................................. 17–6
17.7 VersaFEC ACM Latency ...................................................................................................... 17–8
17.8 Configuring VersaFEC ACM in the CDM-625 ....................................................................... 17–9
17.9 Monitoring ACM performance ......................................................................................... 17–11
17.10 ACM Congestion Control ............................................................................................. 17–12
17.11 Notes and Recommendations ...................................................................................... 17–13
17.12 VersaFEC ACM – Summary of Specifications ................................................................. 17–15
CHAPTER 18. IP PACKET PROCESSOR OPTION .......................................................... 18–1
18.1 Introduction ..................................................................................................................... 18–1
18.1.1 IP Packet Processor – Operational Requirements .............................................................................. 18–1
18.1.2 Interoperability Compatibility/Limitations........................................................................................... 18–2
18.2 IP Packet Processor Features ............................................................................................. 18–3
18.2.1 Streamline Encapsulation (SLE) ............................................................................................................. 18–3
18.2.2 Modes of Operation ............................................................................................................................... 18–3
18.2.3 Subsystem Multiplex (Sub-Mux) ........................................................................................................... 18–3
18.2.4 Adaptive Coding and Modulation (ACM) ............................................................................................. 18–3
18.2.5 FAST Options ........................................................................................................................................... 18–4
18.2.5.1 Header Compression ......................................................................................................................... 18–4
18.2.5.2 Payload Compression ........................................................................................................................ 18–5
18.2.5.3 Advanced Quality of Service (QoS) ................................................................................................... 18–5
18.2.5.4 Advanced Encryption Standard (AES) Encryption .......................................................................... 18–5