Information Management System |
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PDF print version of this specification : A4
or Letter |
The Information Management System (IMS) is a ship-borne network, based on SAFENET,
that manages the transfer of time-critical command and control messages, multimedia
streams and background file transfer from many sources to many destinations. The IMS
architecture supports unicast, broadcast and reliable multicast data transfer types. It also
provides for network synchronisation and message timestamping as well as sophisticated
built-in test and network management.
The IMS offers bounded packet latencies, message-level prioritisation, synchronous
bandwidth allocation, high overall performance, determinism and reliability.
Apart from ship-borne applications, other typical application are in real-time
vetronics systems as well as tactical command and control systems.
IMS Architecture
The C²I² Systems Information Management System (IMS) communications architecture
follows the dissemination architecture designed for real-time communications, refer
to in the Dissemination Architecture below. The IMS communications architecture
supports many-to-many connections which is best suited to distributed,
time-critical information flow. The IMS allows nodes on the network to produce and
consume data on the physical network and provides distributed control of the network. The
IMS manages the actual data transfers between nodes on the network. Each node dynamically
registers with the IMS and then becomes a producer and/or consumer until deregistration.
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The IMS handles the multicasting of all data on the network,
thereby allowing virtual links to be setup between the nodes on the network. This
architecture is symmetric, robust to changes and failures and is very efficient. The
IMS communications architecture differs significantly from the older point-to-point
(e.g. TCP) and client-server (e.g. RPC) architectures. These architectures
suffer from complex connection and error recovery problems as well as single points of
failure. |
IMS Dissemination Architecture |
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Functions
Transfer Control Data
- Application Interface Services (APIS)
- Xpress Transport Protocol (XTP)
- Internet Protocol (IP)
Transfer Bulk Data
- File Transfer Services (FTS)
- User Datagram Protocol (UDP)
Network Time Services
- Network Time Protocol (NTP)
- Packet Timestamping
Network Management Services
- Built-in Test Services (BITS)
o LAN Adapters
o Cable Plant
- Simple Network Management Protocol (SNMP V2.0)
- Graphical Human-Machine Interface
- Operator-Assisted Trouble-Shooting, Maintenance and Reconfiguration
Cable Plant
- 62,5 µm / 125 µm Multimode Fibre Cable Plant
- Dual-Redundant Standard
- Quad-Redundant Optional
- Optical Bypass Switches
- Ruggedised COTS Concentrators
- Trunk Coupling Units
Features
- Critical Virtual Circuit Capability
- Multi-Level Packet Priority
- FDDI Synchronous Mode
o Synchronous Bandwidth Allocator
o End Station Support
- Multi-Protocol Support
- SAFENET-Compatible
- Ruggedised FDDI Connectors (ST)
Performance
- < 950 µs end-to-end latency (< 200 byte messages)
- > 15 Mbits-1 end-to-end throughput (> 4 000 byte messages)
- < 250 µs node-to-node synchronisation accuracy (2 sigma)
IMS Rev. 3 2010-09-01
CCII Systems (Pty) Ltd • P.O. Box 171 • Rondebosch 7701 • South Africa 
Telephone : (+27 21) 683 5490 • Facsimile : (+27 21) 683 5435 •
WWW : www.ccii.co.za
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