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Transcript
COMSOFT
is making the link
AMHS Interoperability
AMHS Implementation Workshop
Chennai, India
15–16 December 2008
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 1
Overview
 Mixed environment
 ATN protocol variants
 AMHS interoperability
 Impact and limitations
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 2
Mixed Environment
 Transition period
AMHS
AFTN
 AFTN
 AMHS
AFTN
+
AMHS
• ATN/OSI
• ATN/IPS
ATN/ISP
ATN/OSI
AMHS
AFTN
+
AMHS
AMHS
AFTN
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 3
End User Connectivity
 AFTN to AFTN
AFTN
AFTN
AFTN
AMHS
AFTN
 AFTN to AMHS and vice versa
AFTN
AFTN
AMHS
AMHS
 AMHS to AMHS
AMHS
AMHS
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 4
AMHS
ATN Protocol Variants
 AMHS over ATN/OSI
• Initial approach as per ICAO Doc 9705
• Adopted early by ASIA/PAC Regions
 AMHS over ATN/IPS
• Introduced to use widespread IP technology
• Optional in ASIA/PAC Regions
AMHS
over
ATN/IPS
AMHS
over
ATN/OSI
?
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 5
AMHS Protocol Stack
 AMHS Application
Application
• based on OSI 7 layers
 AMHS upper layers
• Layers 5 - 7
• Uniform
• Independent of networks
 AMHS lower layers
• Layers 1 - 4
• ATN/OSI or ATN/IPS
7
Application Layer
6
Presentation Layer
5
Session Layer
4
Transport Layer
3
Network Layer
2
Data Link Layer
1
Physical Layer
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 6
AMHS over ATN/OSI
 Transport Protocol Class 4
 Connectionless Network Protocol
 Various sub-networks
• LAN: LLC1, ...
• WAN: X.25, ...
 ATN Router
Transport Layer
4
Transport Protocol Class 4 (TP4)
Network Layer
3
Connectionless Network Protocol (CLNP)
LLC1
2
• Unique to aviation due to extensions
• Designed to support G/G and A/G
• Open for integration of other sub-networks
CSMA/CD
LAN
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 7
...
...
X.25
...
LAPB
WAN
AMHS over ATN/OSI
 Example for a pure ATN/OSI environment
 AMHS Applications operate over LAN (e.g. TP4 / CLNP / LLC1)
 ATN Router interconnect using WAN (e.g. CLNP over X.25)
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 8
AMHS over ATN/IPS
 Transport Protocol Class 0
 Transmission Control Protocol
 Internet Protocol
4
• IPv4 (RFC 1006)
• IPv6 (RFC 2126)
3
 Standard IP Router
2
Transport Layer
Transport Protocol Class 0 (TP0)
RFC 1006 / RFC 2126
Transmission Control
Protocol (TCP)
Internet Protocol (IP)
CSMA/CD
• Interoperability IPv4/v6 by
Network Address Translation and
Protocol Translation (NAT/PT)
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 9
LAN
AMHS over ATN/IPS
 Example for a pure ATN/IPS environment
 AMHS Applications operate over LAN (e.g. TCP/IP / Ethernet)
 IP Router interconnect using WAN (e.g. TCP/IP over Frame Relay)
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 10
Coexistance of ATN/OSI and ATN/IPS
 How to connect ?
Appl.
ATS Message
Server
ATS Message
Server
Appl.
Pres.
Pres.
Session
Session
TP4
TP0
CLNP
TCP/IP
?
...
ATN Router
...
IP Router
AMHS
ATN/OSI
AMHS
ATN/IPS
 Common Protocol Stack required
 Protocol stacks are not compatible!
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 11
AMHS using Dual Stack Router
 Example for a dual stack router
ATS Message
Server
Application
ATS Message
Server
Appl.
Presentation
Pres.
Session
Session
TP4
TP0
TP0
CLNP TCP/IP
...
TCP/IP
Dual Stack
Router
...
...
IP Router
AMHS
ATN/OSI
AMHS
ATN/IPS
 AMHS End Systems operate over LAN
 ATN Router implements both stacks and a Transport Bridge
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 12
AMHS using Dual Stack Application
 Example for a dual stack ATS Message Server
ATS Message
Server
Application
ATS Message
Server
Appl.
Presentation
Pres.
Session
Session
TP4
TP0
TP0
TCP/IP
CLNP TCP/IP
...
...
...
ATN
Router
AMHS
ATN/OSI
IP Router
IP Router
AMHS
ATN/IPS
 AMHS Application implements both stacks
 ATN Router interconnects using ATN/OSI
 IP Router interconnects using ATN/IPS
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 13
AFTN/AMHS Gateway
 Interconnects AMHS with AFTN
• Seamless transition from AFTN to AMHS
• AFTN – AFTN over AMHS
 Bi-directional message exchange
• ATS Messages
• Conversion of addresses and contents
• Limitations from AMHS to AFTN
 Transparent to end users
 End users can migrate any time
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 14
AFTN/AMHS Gateway
 AFTN – AMHS
• AFTN/AMHS Gateway on AFTN side
 AFTN – AFTN
AMHS
• AFTN/AMHS Gateway
ATS Message
Server
on both sides
AFTN/AMHS
Gateway
AFTN
AFTN/AMHS
Gateway
AFTN
AMHS
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 15
Interoperability Tests
 Ensure interoperability of products from different suppliers
 ASIA/PAC AMHS Manual
• Conformance (Annex B)
• Interoperability (Annex E)
• Per-Operational (Annex F)

 ATN Routers and AMHS Applications are interoperable
• Trials
• Interoperability tests
• Daily operation
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 16
Plans for ASIA/PAC Regions
 Strategy for ATN/IPS in ASIA/PAC is under consideration
 Backbone systems implement dual stack solutions
• ATN/OSI
• ATN/IPS
 Non-backbone system may
implement ATN/OSI or ATN/IPS
 Long-term objective: ATN/IPS
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 17
Summary
 Coexistance of ATN/OSI and ATN/IPS
• Dual stack routers or applications
 Integration of AFTN users
• AFTN/AMHS Gateway
 Transparency for end users
• AFTN
• AMHS
 Interoperability Tests
• ASIA/PAC: AMHS Manual
• EUR: ECG initiative and AMHS Manual
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 18
Thank you !
[email protected]
 COMSOFT GmbH | AMHS Interoperability | December 2008 | Page 19