IBM ISA Installation And Testing Instructions page 27

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Notes:
1) There may be a clearance problem in some pes
when putting on the T-connector and attaching to
the 10BASE2 network. If you encounter this
problem, rotate the T-connector 90 degrees to allow
more clearance.
2) The maximum length of thin coaxial cable between
each repeater is 606.8 feet (185 meters).
If the computer you are installing is the last in the
Ethernet network, attach the cable from the Ethernet
network to one end of the T-connector. Attach a
50-ohm terminator to the other end of the T-connector.
(See the following figures.)
J
[Q1
10
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T-Connector
The IBM ISA Ethernet Adapters
13