Multi-Tech Systems 40-01459-D0-001 - Manual (Page 43)

TCP/IP Direct Connect 37
MTU – Maximum Transmission Unit must match what is defined on the
mainframe for this connection or packet loss will occur. The recommended MTU
for CTC connections is 32000.
To configure MPC+ links, either HSAS or MPCPTP, please refer to the MPC+ for
Windows Installation Guide.