1、 TIA STANDARD Satellite Network Modem System (SNMS) General Requirements TIA-1073.000 October 2005 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of NOTICE TIA Engineering Standards and Publications are designed to serve the p
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19、 CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA-1073.000 iTable of Contents 1 Scope. 1 2 References. 3 3 Acronyms 4 4 Network Topologies . 6 4.1 Hub-Spoke Topology 6 4.2 Mesh Topology . 7 5 Forward Link 8 5.1 DVB-S2. 8 5.2 Adaptive Coding and Modulation on the Forward Link. 8 5
20、.3 Symbol Rate 8 5.4 IP Encapsulation . 8 6 Return link base-band physical layer specification and multiple access definition . 9 6.1 RCST Synchronization . 9 6.2 Burst Format . 9 6.3 Randomization for energy dispersal . 10 6.4 Coding. 10 6.5 Modulation 10 6.5.5 Adaptive Symbol Rate, Code Rate and M
21、odulation on the Return Link. 11 6.5.6 Information Burst Rates and Frame Time . 11 6.6 MAC Messages. 12 6.7 Multiple Access 12 6.8 Capacity request categories. 12 6.9 Connection Control Signaling. 12 7 Synchronization Procedures . 12 8 Control and Management 12 9 Security, Identity, Encryption. 12 1
22、0 Other SNMS Requirements 12 10.1 IF/RF and Terrestrial Interface . 12 10.1.1 IF/RF Interface 12 10.1.2 Terrestrial Interface. 12 10.2 IP Processing. 13 10.3 Interoperability 13 10.4 Multi-Beam (Split-Beam) Operation 13 10.5 Number of Terminal Modems in a Network. 13 10.6 Number of Carriers in a Net
23、work . 13 10.7 Simultaneous Carriers. 13 10.8 Satellite Systems . 14 TIA-1073.000 iiTable of Figures Figure 1. SNMS Standard Document Tree. 2 Figure 2. High Level Diagram of DVB-RCS Hub-Spoke Network . 6 Figure 3. High Level Diagram of DVB-RCS Mesh Network . 7 Figure 4. DVB-S2 System Diagram 9 Figur
24、e 5. Bit mapping into BPSK constellation. 10 Figure 6. Bit mapping into 8-PSK constellation 11 TIA-1073.000 iiiREVISION HISTORY Revision Number Date Released Comments 1.0 10 March 2005 1.1 24 March 2005 1.2 6 April 2005 1.3 20 June 2005 TIA-1073.000 11 Scope TIA-1073 is a multi-part standard that wh
25、en taken in total, defines the requirements for a Satellite Network Modem System using Time Division Multiplexing (TDM) and Multi-Frequency Time Division Multiple Access (MF-TDMA) signaling. The Satellite Network Modem System (SNMS) standard defines the technical requirements for meeting the functio
26、nal capabilities described in TIA/EIA-157 1. This SNMS standard defines the requirements for Hub-Spoke as well as Mesh satellite network topologies operating over transponded/transparent satellite systems. As stated previously, TIA-1073 is a multi-part standard. The collection of parts making up thi
27、s revision of TIA-1073 is depicted below in Figure 1. The present document, SNMS General Requirements (TIA-1073.000), provides the general requirements necessary to achieve SNMS interoperability for hub-spoke and mesh network topologies. The general requirements that shall be met by the SNMS referen
28、ce publications that were developed by European Telecommunications Standards Institute ETSI for Digital Video Broadcast (DVB). These referenced publications are freely available at http:/www.etsi.org. Specifically, the SNMS shall fully meet the DVB-RCS and DVB-S2 requirements in ETSI EN 301 790 and
29、ETSI EN 302 307 2, 3 unless otherwise specified by this document. In addition, the general requirements specify modifications to, additions to, and/or deletions to the specifications in 2, 3, and other requirements necessary to provide the capabilities described in TIA/EIA-157. These modifications u
30、se the same paragraph number system as in the reference documents. Enhanced upper level networking interoperability requirements and encryption requirements are under development as other parts of this standard. The upper level networking requirements for SNMS are under development and will be provi
31、ded by the SNMS Network Layer Protocols (TIA-1073.001). The enhanced encryption requirements for SNMS are under development and will be provided by the SNMS Encryption Requirements (TIA-1073.002). TIA-1073.000 2Figure 1. SNMS Standard Document Tree SNMS Network Layer Protocols (TIA/EIA-1073-001) DVB
32、-RCS Guidelines ETSI TR 101 790 Satellite Network Modem System (SNMS) General Requirements (TIA/EIA-1073-000)DVB-RCS ETSI EN 301 790 DVB-S2 ETSI EN 302 307 SNMS Encryption Requirements(TIA/EIA-1073-002)IP Modem FCD(TIA/EIA-157)C2P Annex JUnder development in TIA 34.1.7TIA-1073.000 32 References The
33、following references have been used in this document: 1. IP Modem Functional Capabilities Description (FCD), TIA/EIA-157, Version 2.6, 13 Jan 2005. 2. Digital Video Broadcasting (DVB); Interaction Channel for Satellite Distribution Systems, ETSI EN 301 790 v1.4.1 (2005-09). 3. Digital Video Broadcas
34、ting (DVB); Second generation framing structure, channel coding and modulation systems for Broadcasting, Interactive Services, News Gathering and other broadband satellite applications, ETSI EN 302 307 v1.1.1 (2005-03). 4. Digital Video Broadcasting (DVB); Framing structure, channel coding and modul
35、ation for 11/12 GHz satellite services, ETSI EN 300 421. 5. Digital Video Broadcasting (DVB); Interaction Channel for Satellite Distribution Systems, Guidelines for use of EN 301 790, ETSI TR 101 790. TIA-1073.000 43 Acronyms The following acronyms have been used in this document: Acronym Descriptio
36、n 8PSK Eight Phase Shift Keying ACM Adaptive Coding and Modulation ACQ Acquisition Burst BPSK Binary Phase Shift Keying C2P Connection Control Protocol CCM Constant Coding and Modulation CNI Carrier to Noise plus Interference ratio CRSC Circular Recursive Systematic Convolutional CSC Common Signalin
37、g Channel (Burst) DULM Data Unit Labeling Method DVB Digital Video Broadcast DVB-S Digital Video Broadcast via Satellite DVB-MPE DVB Multi-Protocol Encapsulation DVB-RCS DVB-Return Channel via Satellite ETSI European Telecommunications Standards Institute FCD Functional Capabilities Description FEC
38、Forward Error Correction IETF Internet Engineering Task Force IF Intermediate Frequency IP Internet Protocol Kbps Kilo bits per second Ksps Kilo symbols per second LAN Local Area Network MAC Media Access Control MF-TDMA Multi-Frequency Time Division Multiple Access MPE Multi-Protocol Encapsulation M
39、PEG Moving Picture Experts Group MPEG-2 Standard for compression and framing, from the Moving Picture Expert Group TIA-1073.000 5Acronym Description MPEG2-TS MPEG-2 Transport Stream Data Unit NCC Network Control Center PEP Protocol Enhancement Proxy PID Program Identifier or Packet Identifier PLFRAM
40、E Payload Frame RS Reed-Solomon Forward Error Correction mechanism QPSK Quadrature Phase Shift Keying Modulation Technique QoS Quality of Service RCS Return Channel via Satellite RCST Return Channel Satellite Terminal RF Radio Frequency SAC Satellite Access Control SNMP Simple Network Management Pro
41、tocol SNMS Satellite Network Modem System SNI Signal-to-Noise plus Interference ratio SCT Super-frame Composition Table SYNC Synchronization Burst TBTP Terminal Burst Time Plan TCP/IP Transmission Control Protocol for Internet Protocol TCT Timeslot Composition Table TDMA Time Division Multiple Acces
42、s TDM Time Division Multiplexing TS Transport Stream UDP/IP User Datagram Protocol/Internet Protocol VCM Variable Coding and Modulation WAN Wide Area Network TIA-1073.000 64 Network Topologies 4.1 Hub-Spoke Topology A Hub-Spoke network configuration includes the following elements: A Hub that provid
43、es the high rate DVB-S2 outbound channel and terminates the inbound DVB-RCS channels. In addition, the hub provides interfaces with external terrestrial networks such as Internet Protocol (IP) based networks. Return Channel Satellite Terminals (RCSTs) which are low cost and high-performance satellit
44、e terminals that receive the DVB-S2 outbound channel and transmit the DVB-RCS return channel, and provide interfaces with end user systems. The RCST contains a modem that takes the digital bit stream from the network interface and modulates it to analog signals for transmittal over the satellite acc
45、ording the DVB-RCS specification, and demodulates the incoming DVB-S2 analog signals into a digital bit stream for output on the network interface. DVB-S2/RCS HubRCS MF-TDMADemodDVB-S2TDM MODHub RCS MACDVB-S2/RCS TerminalRCS MF-TDMABurst ModDVB-S2TDM DemodTerminal RCS MACFigure 2. High Level Diagram
46、 of DVB-RCS Hub-Spoke Network TIA-1073.000 74.2 Mesh Topology Mesh topologies are characterized by the ability of terminals to communicate directly with each other without the need to go through a central Hub. Figure 3 shows a high-level diagram of an RCS Mesh network operating over transponded sate
47、llite systems. An RCS Mesh network can simultaneously support both standard RCS terminals and terminals with Mesh capability. An RCS mesh network contains a central Hub that generates a forward link TDM signal defined by ETSI EN 302 307 that is received by all terminals on the network 3. All termina
48、ls can transmit back to the hub using one or more burst TDMA return link channels defined by ETSI EN 301 790 2. In addition to this DVB-RCS Hub-Spoke functionality, some of the terminals also have the capability to receive one or more RCS burst TDMA return link channels. This gives the Mesh terminal
49、s the capability to communicate with each other directly without going through the Hub. Mesh terminals can simultaneously share RCS return channels with other Mesh terminals as well as Hub-Spoke only capable terminals. The Hub controls all return channel configuration, control, and resource management just as in RCS networks defined by ETSI EN 301 790 2. The framework for mesh connection control signaling is defined by the Connection Control Protocol (C2P) in Annex J of ETSI TR 101 790 5. DVB-S2/RCS HubPartial Mesh CapableRCS MF-TDMADemodDVB-S2ModulatorHub RCS MACDVB-S2
