IBM 5280 User's Setup Manual page 86

10. Printers that have two sockets and several switches (as shown
in the following illustrations) have the Cable Thru feature. The
Cable Thru feature lets you connect two or more printers to
one IBM 5288 socket.
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IBM 5256 IBM 5224
Note: The IBM 5224 always has the Cable Thru feature.
a. If you are connecting only one printer to one IBM socket, go to step 11.
b. If you are connecting two or more printers to one IBM 5288 socket,
go to step 13.
User's Setup Procedures 79