IBM 5280 User's Setup Manual page 92

21. Read the following four steps before connecting the
communications cable.
a. Look at the communications socket. This is where you will
connect the communications cable .
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III II
11111111
Communications
Socket (socket number
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b. Find the communications cable.
c. Position the cablel; then push the cable into the socket.
Note: If the cable does not fit easily into the socket, be sure that the
connector guides line up with the socket.
d. Make sure that the snap-locks lock into position. The other end
of the communications cable will be connected later, in Section
9.
22. Cut the string from the power cord plug and insert the plug
into a grounded receptacle.
User's Setup Procedures 85