The iLink order entry protocol on CME Globex provides:

Simple Binary Encoding (SBE) - optimized for low latency of encoding and decoding
FIX Performance (FIXP) protocol - supports simple session layer management; no session-level information (e.g. headers) required
Optimized order entry on the CME Globex platform for futures, options, BrokerTec, and EBS markets
Lean messages move administrative information out of order entry business message
Standard message size, fixed positions, and fixed length fields
Consistent encoding method for market data and order entry
XML schema and templates for order entry as with MDP 3

All iLink sessions are Cancel on Disconnect (CoD) mandatory, except iLink CGW sessions for futures and options markets.

All newly created iLink CGW sessions will be created with Cancel on Disconnect (COD) enabled. To disable COD, Clearing Firm Administrators must enter the change request via Firm Admin Dashboard (FADB).

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iLink Gateway Considerations

iLink has the following considerations for Convenience Gateway (CGW), Market Segment Gateway (MSGW), and Drop Copy Gateway (DCGW) customers:

	CGW and MSGW	DCGW

	CGW and MSGW	DCGW
iLink	CGW and MSGW sessions support iLink Binary Order Entry.	Drop Copy supports both CGW and MSGW source sessions. The encoded payload messages sent on Drop Copy with iLink source sessions will be in ASCII format, but reflect the behavior described in the Drop Copy Client functional specification.

Developing to iLink

The following table summarizes the considerations for client systems developing to iLink:

Layer	Feature	iLink

Layer	Feature	iLink
Presentation	Message encoding	Simple Binary Encoding
Session	Authentication, Recovery	FIX Performance Session Layer (FIXP)
Application	Business logic	Improved FIX semantics
Transport	End-to-end delivery	TCP
Network	Virtual Circuits, Routing	IP

This diagram provides an overview of iLink order entry architecture.