iLink 3 uses Simple Binary Encoding (SBE) optimized for low latency of encoding and decoding while keeping bandwidth utilization reasonably small. All FIX semantics are supported. This encoding standard describes the wire protocol for iLink 3 messages and is complimentary to other FIX standards for session protocol and application-level behavior.
This topic describes implementation of SBE in submitting orders on CME Globex and receiving order entry responses.
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iLink 3 Decoder -Real Logic Ltd. and Informatica have collaborated to create open source tools that provide extensive support for Simple Binary Encoding (SBE), the messaging standard developed through the Financial Information Exchange (FIX) Trading Community. The SBE decoders will create an environment that can be used directly by customers or treated as a reference implementation that can be extended into custom solutions tailored to individual customer's needs. The information and tool are open to the public under an Apache Public License and are available here.
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Binary Encoding
Binary encoding provides direct data access without complex transformations or conditional logic by:
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- An overall message length including headers to support framing.
- An identifier of the encoding used in the message payload. This supports selecting the correct decoder in the case where multiple message encodings are used on a session. It also aids tools such as protocol analyzers to identify message protocols contained in network packets.
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The framing standard specifies that the framing header will always be encoded in little-endian byte order. |
Simple Open Framing Header (SOFH) (4 bytes) | SBE Header (8 bytes) | SBE Message (Variable Length) |
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Message Length: 2 bytes
| Block Length: 2 bytes
| Customer to CME Globex Messages Example:
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Encoding Type: 2 bytes
| TemplateID: 2 bytes
| CME Globex to Customer Messages Example:
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SchemaID: 2 bytes
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Version: 2 bytes
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