TELEMETRIX 500 GATEWAY PROTOCOL TRANSLATOR (T500GT) |
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| OVERVIEW |
The RT Logic Telemetrix® 500 IP Gateway Protocol Translator (T500GT) is the next generation system for interconnecting control centers to baseband ground station antenna sites. The T500GT deterministically |  |
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| transports Telemetry (TM), Telecommand (TC), mission
data, IRIG, and digitized analog signals between locations linked by commercial or private IP-based networks. Both serial-to-packet and packet-to-serial protocol
conversions are supported, enabling the T500GT to perform protocol conversions between serial-interface devices and IP-based networks. |
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| APPLICATION |
Control centers, ground stations, test sites, vehicle factories, and payload processing facilities are migrating from
dedicated serial interconnections to commercially available IP networks. A system is needed that supports both legacy protocols and emerging net-centric protocols
such as SLE. The T500GT connects existing serialbased ground telemetry systems to an IP network and acts as a bi-directional groundbased data conduit from satellite modem to the end user. The T500GT understands the format and protocol of TM and TC streams, allowing it to efficiently translate to and from packets. Each protocol is uniquely handled to protect against lost or stale data, and to ensure on-time delivery. Protocol conversions are implemented in dynamically linked libraries, allowing easy tailoring of the T500GT. The T500GT also supports classic TT&C front-end processing, such as command formatting, CCSDS/TDM frame synchronization, and IRIG time stamping. Two major variants of the T500GT are described by this data sheet: The T500GT-LR is typically used when the remote baseband equipment requires a serial interface for telemetry and command streams, whereas the T500GT-SA is used when the remote baseband equipment supports a direct network connection for telemetry and command data streams. |
FEATURES |
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| T500GT-LR |
The T500GT Local/Remote configuration (T500GT-LR) uses a pair of T500GTs – one on each side of the IP network.
The T500GT-LR pair encapsulates the network, making it transparent to the on-time delivery of deterministic digital/digitized signals.
Variable network latency is factored out by rate buffers and a deterministic data timetagging scheme that embeds time-tags from an Inter-Range
Instrumentation Group/Global Positioning System (IRIG/GPS) time source. |
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| T500GT-SA |
The T500GT Stand-alone configuration (T500GT-SA) uses a single T500GT to perform the appropriate protocol
conversion (serial-to-IP or IP-to-serial) to “package” the data streams as required for the remote baseband system. Remote ground facilities
supported by the T500GT-SA include commercial baseband systems, the National Aeronautics and Space Administration (NASA) network, Universal Space
Network (USN), test facilities, and custom remote antennas. As a Consultative Committee for Space Data Systems (CCSDS) Space Link Extension (SLE) edge
device, the T500GT transports CCSDS Telemetry/Telecommand (TLM/TC) frames using a NASA/ESA interoperable version of SLE. |
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| MODULAR DESIGN |
The T500GT is a high-performance, real-time, high-rate digital processing system and protocol translator
with dynamically reconfigurable algorithms. The T500GT has a full range of firmware and software personality options for processing low to high-rate
CCSDS/TDM telemetry, multiplexing/demultiplexing, Time-Data Correlation (TDC), IRIG time-stamping/ generation, PCM simulation, derandomization, error
detection and correction (BER, Reed-Solomon, CRC), archive, digital/analog recording, playback, and custom functions. |
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| SPECS |
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