OLSG Report_Final_06_05_12 - Interagency Operations Advisory ...

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Optical Link Study Group (OLSG) Final Report IOAG.T.OLSG.2012.V1 For example, the “Return All Frames” and the “Return Channel Frames” services shown in Table 33 can be used for optical links, but new interface standards will have to be added in the second column. Figure 83 shows how optical standards could fit next to current CCSDS protocols. Table 33: Description of the Return All Frames Service (copied from the IOAG Service Catalogue #1). IOAG Service Types Return All Frames Service Return Channel Frames Service Space Link Interface Standards 1 Radio Frequency and Modulation [RFM] 2 TM Synchronization and Channel Coding [TM-S&C] Those for “Return All Frames Service” plus: TM Space Data Link Protocol [TM-DLP] AOS Space Data Link Protocol [AOS] Ground Link Interface Standards 1 SLE Return All Frames [RAF] SLE Return Channel Frames [RCF] SECURIT Y DATA COMPRESSION DTN-BP/BSP IPv6 IPv 4 CFDP LTP Encap Space Packet Protocol AOS Services Prox-1 TM, TC AOS Channel Coding and Sync RF & Modulation RANGING SLS AREA DELTA DOR PN RANGING Optical standards ? - Meteorological data - Wavelength - PAT - Modulation - Coding - Protocols Figure 83: Current protocols of the Space Link Service area. Possible future optical standards would fit in the lowest two layers. Page | 144
Optical Link Study Group (OLSG) Final Report IOAG.T.OLSG.2012.V1 For the sake of simplicity and effort reduction, one may consider, as a first step, optical space link standards that 1. affect only the "Synchronization and channel coding” sublayer and the physical layer, 2. provide an interface to IOAG return services defined on the frame level (data link protocol sublayer and above), and 3. do not impact the ground link standards (which are associated with the Space Link Extension services). 5.3.2.2 Impact of High Data Rates A large increase of the data rate with respect to current links can imply the need for new protocol standards. 5.3.2.2.1 Space Link An optical space link can easily support 10 Gb/s. To avoid new standards or services for data rates that are too high, two solutions related to data processing can be considered: • Increase of the frame coding/decoding speed • Offline decoding processing (i.e. store and retrieve later "slowly") The frame format defined by both CCSDS 132.0 and 732.0 is limited to about 16 kbits. Increasing the frame size (to keep the frame rate constant) would require new standards for the data link protocol sublayer, and thus new cross-support services. 5.3.2.2.2 Ground Link When the space link has repeated periods of unavailability and the ground terminal can store the data, the ground link (from ground terminal to operation center) does not have to support data rates as high as those of the space link. However, it should be guaranteed that the long-term capacity of the ground link is higher than that of the space link. As a guideline, one can consider the Space Link Extension-Application Programming Interface (SLE-API) software which currently shows a performance limit of 700 Mbps excluding frame encoding overhead but including SLE protocol overhead etc. (i.e. a real limit around 90-95% of this figure). 5.3.3 Diversity of Technical Solutions At this time there are numerous technical solutions being investigated by member agencies. No one solution can be identified for standardization at this time. As an example of this diversity, Table 34 describes the wavelengths and acquisition and modulation techniques planned for demonstration over the next few years, and depicts the level of diversity in the technical solutions. Page | 145
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