412 th Test Wing War- Winning Capabilities On Time, On Cost A New - - PowerPoint PPT Presentation

A New Standard for Packets: RCC 106 Chapter 7

412th Test Wing

Jon Morgan JT3 661-277-8942 I n t e g r i t y - S e r v i c e - E x c e l l e n c e

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War-Winning Capabilities … On Time, On Cost

14 May 2015

Chapter 7 – An Overview

History

• ITC 2012 Multiple Vendors demonstrated working HW
• Multiple Vendors shipping similar HW solutions
• Multiple ranges with multiple vendor solutions
• SCREAMS STANDARDIZATION
• R&R (CH10) committee created CR76

– Mike Golackson

• IRIG106-2015 Chapter 7

– Packet Telemetry Downlink – Responsibility of Data Multiplex Committee

• Appendix Q

– Supplemental Golay encoding information

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Chapter 7 – An Overview

What is it?

• Originally CH10 Only

– Includes full CH10 data types

• 1553, PCM, Video, analog, ethernet, etc.

– Added TCP and general IP packet bus monitoring – Included iNet (TmNS) bus monitoring

• Wrapper for the payload of “any packets”

– CH4 compliant – Minimal overhead

• FEC is added to the CH7 wrapper but not the payload

– Extended Binary Golay Code

– Based on CCSDS

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Chapter 7 – An Overview

What is it? (cont)

• As Chapter 8 is for 1553, CH 7 is for Data Packets
• 1553 can be thought of as a ‘small packet’ protocol
• Support for low latency packets
• Guarantees some data sources have low latency
• Only Packets”

– No RAW data types added to protocol

• THE FUTURE IS ETHERNET!!!
• Everything has an RJ45 plug

– (Not saying this is good or bad. It just is.)

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Chapter 7 – An Overview

What is it? (cont)

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1553 Video PCM …ANY CH10 Data Type

CH10 Recorder iNet Box TCP/IP UDP Box(es) Randomizer CH4 SST

IP N e t w

• r

k

Transmitter CH7 Box CH4 SST

Serial Streaming Telemetry

Network TAP (RJ45)

CH7 IS JUST A DOWNLINKED REAL-TIME BUS MONITOR

Low BW Network TAP (Card)

Chapter 7 – An Overview

What is it? (cont)

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1553 Video PCM …ANY CH10 Data Type

De-Randomizer CH4 SST

IP N e t w

• r

k

Receiver CH7 Box Network TAP (RJ45) CH4 SST On the ground the CH7 Box can be implemented in software. THIS IS BEING DONE.

Chapter 7 – An Overview

Protocol (Simplified)

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1 Sync Word (Bits 31…24) 2 Sync Word (Bits 23…16) 3 Sync Word (Bits 15…08) 4 Sync Word (Bits 07…00) 5 Data Byte 1 … … 4+N*223 Data Byte N*223

FRM SYNC

(32bits)

CH7 HEADER PREVIOUS PACKET (N – 1) NEW PACKET (N) NEW PACKET (N + 1) FRM SYNC

(32bits)

Chapter 7 – An Overview

Protocol (cont)

• Stream ID

– 4 bits adjacent to the frame sync

• Why?

– All CH7 formats are alike

• The freq and bit rates are different

– Not always helpful to the tech on the ground

– If each emitter uses a different Stream ID

• The different CH7 streams now become “SELF IDENTIFING”

– Program your decom for 36 bits (32 FS + 4 SID bits)

• Only ‘your’ emitter will lock to your decom.

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Chapter 7 – An Overview

Advantages

• Air

– No major costs or infrastructure impacts – Takes advantage of existing hardware components

• Transmitters, Secure boxes, recorders, networks/busses

– One new hardware device is required. (This is not an

advantage.)

• Possible to adapt existing CH10 recorders
• Ground

– No infrastructure changes and minimal added cost – Uses existing hardware components

• Receivers, Secure boxes, Bit Syncs, Decoms

– (Recovering original stream may require new Hardware)

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Chapter 7 – An Overview

Advantages (Cont)

• Uses existing Software tools

– CH10 IP streaming, CH8, 1553, CH4 Decoms, Wireshark – iNet

• No new technology or protocols

– Adaption of existing legacy mature protocols

• CH9 (TMATS) for setup
• CH6 for command and control
• CH10 IP streaming
• IP protocols

– UDP – Bus monitoring of TCP/IP

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Chapter 7 – An Overview

Disadvantages

• Growing Pains

– No CH7 compliant (or compatible) HW is shipping – Not much momentum (Official buy in) – Ground software development

• Minimal effort

– No interoperability testing – No 118 Test Methods

• Data Multiplex committee
• Operational

– Some added overhead on protocols with their existing overhead

• CH7 wrapper on top of payloads wrapper

– It is half duplex

• Other then bus monitoring TCP/IP is not possible.

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Chapter 7 – An Overview

Current Status

• IRIG106-15 Standard

– Final tech-edits completed March 2015 – Published May 2015??

• Airborne

– Hardware

• Support very soon

– Software

• CH9 (TMATS), basic functionality is included
• Command and Control, minimal functionality

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Chapter 7 – An Overview

Current Status (Cont)

• Ground

– Hardware to recreate original airborne Streams

• Nothing Yet.

– Hardware solution is NOT required

• CH7 IS a standard CH4 SST

– Decoding and recreating (republish) IP packets is not new technology – Software can unwrap the CH7 then unwrap the packets to get the RAW data

• Vendors are already working on this. (Adapting existing

software.)

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Chapter 7 – An Overview

Questions?

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Jon Morgan JT3, LLC Edwards AFB, CA Jon.morgan.2.ctr@us.af.mil 661-277-8942