RTI Transport Services Segment (TSS) provides a FACE-compliant middleware that enables applications to communicate using the publish-subscribe paradigm over different transports like shared memory, sockets, and custom networks. TSS is built on top of RTI Connext DDS and maps the FACE Transport Services API to DDS, allowing applications to leverage DDS features like reliability, scalability and tools. TSS also supports flexible deployment across partitions and nodes, and has a path to DO-178C Level A certification.

1. Your systems. Working as one.Your systems. Working as one.
RTI Support for FACE
Bill Antypas
June 20, 2013

2. RTI Transport Services Segment (TSS)
2
DDS-RTPS wire
protocol compliant:
interoperable with
non-FACE DDS apps
Publish/subscribe
paradigm*
Physical connection(s)
configurable at
integration time
*Will likely support additional
paradigms in future

3. Core Architecture
Built on Standard and Open Interfaces
PCS
Component
PCS
Component
PSS
Component
RTI Connext DDS
Core, Messaging, Micro or Cert
PSS
Component
FACE Security Profile
Transport Services API to DDS Mapping
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Intra-
proces
s
Shared
memor
y
ARINC
Ports
Sockets
Other/
Custom
RTITransportServicesSegment
FACE Transport
Services (TS) API
FACE Security
Profile
RTI transport
API
OMG DDS API
DDS-RTPS
protocol
Pluggable
transports

4. Optimized, Location-Independent
Communication
• Physical transport(s) configurable at integration time
• Applications can use multiple transports concurrently
• Transport(s) configured per application
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Transport Use
Intra-process Within the same address space (process)
Shared memory Between processes in the same partition
ARINC ports Within a node; within or between partitions
Sockets
(UDP unicast or multicast)
Within or between nodes, including over
Ethernet
Low-bandwidth Over satellite or radio links (no IP requirement)
Custom Over custom networks or busses (via plug-in API)

5. PartitionPartitionPartition
Deployment Example
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UoP UoP
Shared memory
App
RTI TSS RTI TSS
UoP UoP UoP
RTI TSS RTI TSS RTI TSS
ARINC Ports
RTI TSS
Bus/Network
Node Node

6. TSS Connection Mechanism Comparison
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RTIDDS
CORBA
Sockets
POSIX
Queues
Shared
memory
Queuing
ports
Sampling
ports
Proximity Intra-partition ● ● ● ● ● ● ●
Inter-partition ● ● ● ● ●
Inter-node ● ● ●
Multiple concurrently ●
Distribution One-to-one ● ● ● ● ● ● ●
One-to-many ● ● ● ● ●
Many-to-one ● ● ●
Many-to-many ● ●
● Unreliable

7. Level E
Partition
Up to Level A Partition
RTI Routing Service:
Transport and Network Routing
• Component of RTI Connext Integrator
• Deployable in uncertified systems or Level E partitions
• Also supports data transformations, protocol mediation
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UoP UoP
ARINC Ports
RTI TSS RTI TSS
UoP
Node Non-Critical
Node or
Partition
UoP
Non-Critical
Node or
Partition
RTI TSS
Bus/Network
Routing
Service
RTI TSS

8. Level E
Partition
Up to Level A Partition
RTI Routing Service:
Transport and Network Bridging
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UoP UoP
ARINC Ports
RTI TSS RTI TSS
Node
Routing
Service
Up to Level A Partition
UoP UoP
RTI TSS RTI TSS
Node
Level E
Partition
Bus/Network
ARINC Ports
Routing
Service

9. Airborne System
Airborne System
Flexible Integration
Including TSS and
Native DDS Apps
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FACE
UoP
FACE
UoP
Local Communication
RTI TSS RTI TSS
Routing
Service
FACE
UoP
FACE
UoP
Local Communication
RTI TSS RTI TSS
Routing
Service
DDS
App
DDS
App
Local Communication
RTI DDS RTI DDS
Routing
Service
Ground System

10. DDS Natively Supports FACE Data Model
• FACE messages are strongly typed
• OMG IDL used by FACE Platform Data Model & DDS
– FACE messages must conform to IDLlanguage mapping
– Apps can use mappings generated by RTI’s IDL compiler
• DDS natively understands data
– Type safety
– Heterogeneous interoperability (languages, CPUs)
– Wire efficiency (minimizes metadata)
– Enables middleware-level filtering (including at source)
– Eases integration (explicit interfaces)
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FACE Platform
Data Model
RTI IDL
Compiler
C
C++
Java
Ada
Include in
application
source

11. Supports DDS QoS
• Messaging reliability: Best Effort and Reliable
• Optional durability maintains consistent state
– Last value(s) persisted by publisher
– Available to late- and re-joining subscribers
– History depth configurable on pub and sub sides
• Automatic failover: Ownership and Strength
• Send/receive cache resource configuration
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12. Certification Path
• Thin layer over DDS
– Currently <2K ELOC
• Compatible with Connext DDS Cert
– DO-178C Level A certifiable
– Evaluation in progress
– ~20K Executable Lines Of Code (ELOC)
– Small memory footprint: ~200 KB library
– Low CPU load: <10% at 30 HZ update rate
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13. Planned FACE Profile Support
Security Safety Base Safety Extended General Purpose
RTI TSS ✔ ✔ ✔ ✔
RTI Connext DDS
Cert ✔ ✔ ✔ ✔
Micro ✔ ✔
Core ✔
Messaging ✔
RTI Routing Service ✔
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14. Tools Support
• RTI Analyzer
• RTI Monitor*
• RTI Recording Service
• RTI Excel Add-in
• Wireshark
• National Instruments LabView
• The Mathworks Simulink and MATLAB
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*Currently supported for Connext DDS Core and Connext DDS Messaging
With pub/sub paradigm: tools are non- or minimally-intrusive, application transparent

15. Summary of RTI TSS Benefits
• Proximity and physical transport independence
• Flexible communication
– 11, 1many, many1, manymany
• Routing and federation
• Interoperability with non-FACE apps
– Peer-to-peer with DDS apps
– Via Connext Integrator for non-DDS apps
• Optimized support for FACE data model
• Rich Quality of Service
• Expeditious path to DO-178C Level A certification
• Tooling
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16. Available Now
• Early Access Release (EAR)
• Based on FACE Technical Standard 2.0
• Complete implementation of C lang TS API
• Portable source code
• No charge for TSS
• Requires license to Connext DDS edition
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17. C AppJava App
Joint Demo
RTI Connext
DDS Micro
RTI FACE Transport Service Segment
DDS-RTPS Wire Interoperability Protocol
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ARM CPU PowerPC CPU
VxWorks 653
RTI Connext DDS Messaging
Android OS