IBM 5280 Technical Newsletter page 128

Communications Cable Diagrams
The communications cable diagrams show cable
connections and probe points for the various IBM 5285
communications configurations. The tables associated
with the diagrams show cable connector, board, and test
point pin numbers. The tables also show level-2 and
level-3 wrap paths for wrap tests. A level 2 wrap is an
internal wrap on the EIA/CCITT, DDSA, or 38LS card.
A level 3 wrap is an external wrap at the IBM 5285
connector panel; connector J140. The following legend
is used to show signal direction and wrap paths.
•
--I
Signal is wrapped
•
Signal is not wrapped
~
•
Pins are common
Communications Cable Diagrams 143