ECB PUBLIC Questions and Answers Question: What is the maximum length of pacs messages? Answer The physical size limitations of the message and the file communication channel is given in chapter 1.4.4 of the ESMIG UDFS, i.e. maximum length of 32 KB for message channel and 32 MB for file channel The size of pacs messages in T2 RTGS is not restricted compared to other messages used by T2 RTGS as: 1) this would undermine the benefit of ISO 20022 and; 2) if any limitation is introduced with T2 RTGS go live, it would be difficult to be removed afterwards. 15 www.ecb.europa.eu ©