T7 Release 11.1: Important information for production start

Release date: 08 May 2023

023/2023 T7 Release 11.1: Important information for production start Xetra Circular 023/23

1.   Introduction

Deutsche Börse Group will launch Release 11.1 of the T7 trading system on 22 May 2023.

The support window for T7 Release 11.1 will take place on Saturday, 20 May 2023, between 15:00 and 18:00 CEST. Connectivity testing during the support window is strongly recommended for all participants and Multi-Member Service Providers.

The circular outlines the most important topics for the go-live preparation that should be considered for the production launch of T7 Release 11.1 as well as details about the support window.

2.   Action required

Participants are requested to perform the following actions not later than Friday, 12 May 2023:

  • Complete and return the production Readiness Statement for T7 Release 11.1 (see section 3.F.)
  • Register a Technical Contact who will be available during the support window (see section 3.E.)

3.   Details

Deutsche Börse Group will launch Release 11.1 of the T7 trading system on 22 May 2023. Please refer to the dedicated document “T7 Release 11.1 Final Release Notes” for a full overview of both the new and changed functional scope. The document is available on the Xetra website www.xetra.com via the link:

A.  Backward compatibility

T7 Release 11.1 will provide backwards compatibility for the T7 ETI/FIX LF interface version 11.0, i.e. participants who do not want to use the new functionality will still be able to connect to T7 with the interface layout version 11.0 after the production launch of T7 Release 11.1.

Public market and reference data interfaces, including EOBI, EMDI, MDI, RDI/RDF, as well as reports and data files, will not provide backwards compatibility.

B.  Preparations for Friday, 19 May and Saturday, 20 May 2023

On Friday, 19 May 2023, T7 Release 11.0 will be in production for the last time. Reports for the business day 19 May 2023 can be expected at the usual time. 

On Saturday, 20 May 2023, Deutsche Börse will convert the Cash Markets T7 production systems to Release 11.1 and initial reference data for business day 22 May 2023 will be available via RDI and RDF following the start of the system in preparation for the support window.

C.  Support window for T7 Release 11.1 on Saturday, 20 May 2023

The T7 Release 11.1 support window will be conducted on Saturday, 20 May 2023, between 15:00 and 18:00 CEST. Connectivity testing during the support window is strongly recommended for all participants and Multi-Member Service Providers to ensure connectivity for the start of trading on Monday, 22 May 2023. Please make sure that a staff member will be available to perform the login to the T7 production system (e.g. T7 Trader and/or Admin GUI and third-party applications).

At this time, the T7 production systems will be available for connectivity testing on the ETI, RDI, FIX LF, MDI, EMDI and EOBI interfaces and via T7 Admin-, T7 Clearer- and T7 Trader GUI. No order and quote entries will be possible.

The T7 Production Public Key for ETI password encryption will be published on the Xetra website prior to the connection test under the path:

Please note that during the support window, at approximately 15:30 CEST, all products in the T7 production systems will be set to "Start of Day", providing participants with the opportunity to perform their regular start of day activities:

  • Market data:

After the start of day, product and instrument state change information messages are sent out. Thereafter, snapshots are sent out periodically (MDI, EMDI, EOBI) in addition to functional beacons or heartbeats via the incremental stream in EMDI and EOBI respectively. Traders do not have access to the orderbook.

Please refer to the document “T7 Release 11.1 Market and Reference Data Interfaces Manual” (Section 9.11.1) for further details.  

  • ETI and FIX LF: 

– In general, session and user logons are possible
– ETI: It is possible to send retransmission requests
– FIX LF: It is possible to send resend requests
– Orderbook management is not possible

Please refer to the documents “T7 Release 11.1 Enhanced Trading Interface Manual” (Section 4.7.11) and “T7 Release 11.1 FIX LF Manual” (Section 3.8.11) for further details.

During the support window, a message “Connection Test Xetra <hh:mm:ss>” or “Connection Test Börse Frankfurt <hh:mm:ss>”, respectively, will appear with an increasing sequence number in the market news view (news board) of the T7 Trader GUI and the T7 Admin GUI.

Deutsche Börse will inform participants about the general progress of the support window via implementation news on the Xetra website, available under the link:

Following the end of the support window, the T7 11.1 production system will be shut down on 20 May 2023 at 18:00 CEST and will be unavailable until Sunday evening. 

MsgSeqNum’s in FIX LF

Please note that after the connection test, MsgSeqNum’s (inbound and outbound) will not be reset upon the next start of day/start of the FIX Gateway. 

This point is documented in the "T7 Release 11.1 FIX LF Manual" in the section “5.10.2 Outage on T7 FIX LF Side”.

D.  Monday, 22 May 2023 – Production start

The first trading day with T7 Release 11.1 will start as usual.

Please note: As the system will be re-started Sunday evening, after the connection test on Saturday, the initial reference data file for the business day 22 May 2023 will be re-generated. As the reference data provided on 20 May 2023 via RDI and RDF prior to the support window may potentially contain some changes, participants are required to use the initial reference data provided following the system start for 22 May 2023.

Orders entered until 19 May 2023 (end of trading) but not executed, will continue to be available on 22 May 2023, unless other validity restrictions were set.

A list of any items that are relevant prior to the production start of T7 Release 11.1 will be provided as of 19 May 2023. This “known limitations” list will be available on the Xetra website under the link:

Please enter details of the contact person who will be available during the support window in the Member Section of Deutsche Börse Group not later than Friday,12 May 2023, under the path:

Member Section > Company Contacts > [+] Create Contact > Contact Types > Release

Please choose the category “Connection Test Responsible” and make sure to check the box “Cash Market T7”.

This will ensure that Deutsche Börse will be able to reach you in any emergency between Saturday, 20 May 2023, and production start on Monday, 22 May 2023.

F.  Provision of the Readiness Statement

We kindly ask all Trading Participants to submit the Readiness Statement for T7 Release 11.1 by Friday, 12 May 2023 latest. Please note that all Trading Participants are required to provide the Readiness Statement. 

The online Readiness Statement for T7 Release 11.1 can be found here: Readiness Statement

Please enter your dedicated Cash PIN in the online questionnaire. The PIN for your company has been sent to the Central Coordinator.

Further information


All Xetra® Trading Participants and Vendors

Target groups:

Traders, Technical Contacts, Security Administrators, System Administrators, 
Nominated Persons, General


Technical Key Account Manager via your VIP number or cts@deutsche-boerse.com


 Technology > T7 trading architecture > System documentation > Release 11.1

Authorised by:

Holger Patt, Oliver Grohmann