IBM 5294 Setup Procedure page 21

You may be attaching up to four cables to your 5294.
If there are work station cables to connect to port 1,
port 2, and/or port 3, continue connecting them until
all of the cables are connected.
Device type/name
~9¢
Location
R/fl
/O~
Work station address
D
SOCke€V
@
12 Control Unit Setup Procedure